ST900 Family General Handbook Siemens Mobility, Traffic Solutions Sopers Lane, Poole, Dorset, BH17 7ER United Kingdom +44 (0)1202 782000 http://www.siemenstraffic.com/ General Handbook for the ST900 Family of Traffic Controllers PREPARED: FUNCTION: Andy White Paul Cox Nick Ebsworth Engineering Manager Lead Engineer Lead Engineer Ruth Davis Technical Author © Siemens plc. 2015 All rights reserved.
ST900 Family General Handbook Change History: Issue 1 2 3 4 5 6 7 8 9 10 11 12 Change Ref First Issued Updated Table 1 and Table 8 to add missing IMU information. Added note to both tables - 248 IO maximum. Figure 9 repaired – ref RFC 3446 CLS lamp monitoring reduced by 1 watt (also changed in Helios HB under RFC) Added ELV Regulatory Sign Kit section 3.14.
ST900 Family General Handbook SAFETY WARNING In the interests of health and safety, when using or servicing this equipment the following instructions must be noted and adhered to: (i) Only skilled or instructed personnel with relevant technical knowledge and experience, who are also familiar with the safety procedures required when dealing with modern electrical/electronic equipment are to be allowed to use and/or work on the equipment.
ST900 Family General Handbook Safety Warning - Lithium Battery This equipment contains a Lithium battery. Do not short circuit, recharge, puncture, take apart, incinerate, crush, immerse, force discharge or expose to temperatures above the declared operating temperature range of the product, otherwise there is a risk of fire or explosion. Batteries should be handled and stored carefully to avoid short circuits. Do not store in disorderly fashion, or allow metal objects to be mixed with stored batteries.
ST900 Family General Handbook WARNING IMPORTANT ELV CONSIDERATIONS: To provide the most reliable operation, Siemens ELV controllers use a DC (unsmoothed) lamp supply which, in common with DC powered telecommunication equipment, is negative with respect to earth so as to avoid electrochemical corrosion effects. To maintain all street voltages within ELV limits, equipment outside the cabinet must be supplied with voltages within the band -48V RMS with respect to earth.
ST900 Family General Handbook Should a source with a large current sourcing capability be applied, catastrophic damage may result. The extent and results of such damage cannot be predicted or guaranteed.
ST900 Family General Handbook TABLE OF CONTENTS 1 INTRODUCTION ................................................................................................ 15 1.1 Purpose ...................................................................................................... 15 1.2 Contact Us .................................................................................................. 15 1.3 Related Documents .................................................................................... 15 1.
ST900 Family General Handbook 4.7 Handset Interface (RS232 Port) ................................................................. 76 5 STAGES ............................................................................................................. 77 5.1 Facilities ..................................................................................................... 77 5.2 Allocation of Phases ................................................................................... 77 5.3 Stages Active ...
ST900 Family General Handbook 11.6 Effect of Red Extensions and SDE/SA ..................................................... 126 12 MODES ............................................................................................................. 127 12.1 Mode Priority ............................................................................................ 128 13 START-UP MODE ............................................................................................ 130 13.
ST900 Family General Handbook 19 MANUAL STEP-ON MODE .............................................................................. 165 19.1 Introduction ............................................................................................... 165 19.2 Description................................................................................................ 165 19.3 Manual Step-On Mode Parallel Stage Streaming Facilities...................... 166 20 SELECTED FIXED TIME, CLF OR VA MODE ..............
ST900 Family General Handbook 27 LINKING ........................................................................................................... 201 27.1 Repeat Pulses .......................................................................................... 201 27.2 OTU Linking.............................................................................................. 201 27.3 Local Linking.............................................................................................
ST900 Family General Handbook 35 SELF-TEST FACILITY ..................................................................................... 236 36 MOVA (MICROPROCESSOR OPTIMISED VEHICLE ACTUATION) .............. 237 36.1 Introduction ............................................................................................... 237 36.2 Instructions for Connecting MOVA to Traffic Controllers .......................... 237 36.3 ST900 Semi-Integral MOVA / Serial MOVA............................................
ST900 Family General Handbook Figure 23 – Double SDE Layout ............................................................................ 115 Figure 24 – Triple SDE Layout............................................................................... 116 Figure 25 – SA Layout ........................................................................................... 116 Figure 26 – Delay Phase Losing Right Of Way .....................................................
ST900 Family General Handbook Table 21 – Summary of UTC Control and Reply Bits ............................................. 136 Table 22 – Time Switch Event Default States ........................................................ 198 Table 23 – Input and Output States ....................................................................... 212 Table 24 – Hardware Checks and Fault Actions .................................................... 227 Table 25 – Lamp Monitor Phase Types ............................
ST900 Family General Handbook 1 INTRODUCTION 1.1 Purpose This handbook gives details of the facilities available in the Siemens Type 900 (ST900) Family of Traffic Controllers using firmware PB801.
ST900 Family General Handbook 667/HB/20168/000 INTERSECTION CONFIGURATOR 004 USERS HANDBOOK This handbook details: The hardware requirements for producing the configuration A brief outline of how to use the configuring system to enter data from the completed customer specification sheets into the computer How to produce the programmed EPROM required to configure the ST900 controller, or download the configuration directly into the controller.
ST900 Family General Handbook 1.4.2 Required Tools In addition to a standard Engineer’s tool kit, the following tools are required when carrying out any work on the ST900 Controller: T-bar key S-18 key – Main Cabinet or Serial handset Techterm, or Old Oyster handset, or Larger Screened Oyster handset Manual Panel key Type 900 1.
ST900 Family General Handbook RLM rms ROW RTC SA SDE SDE/SA STC SVD TfL UTC VA ZXO Red Lamp Monitoring Root Mean Square Right Of Way Real Time Clock Speed Assessment Speed Discrimination Equipment Speed Discrimination Equipment / Speed Assessment Siemens Traffic Controls Selective Vehicle Detector Transport for London Urban Traffic Control Vehicle Actuated Zero Cross-Over 667/HB/32900/000 Issue 12 Page 18 of 265
ST900 Family General Handbook 2 ST900 CONTROLLER 2.1 System Overview The Siemens ST900 is a mains driven Traffic Controller that can be supplied either in a single-door outer case with a 6U logic rack and equipment mounting frame or as a free-standing logic rack housing the power supply, CPU and Lamp Switch cards.
ST900 Family General Handbook The ST900 Controller uses the reliable and proven Mains Lamp Switch Cards as used in the ST800 Controller, offering a total of 32 phases per controller. The ST900 Family supports all existing ST800 equipment such as Gemini, Gemini2, Tele12 OTU, IRM/IMU Card, SDE/SA Card (if the SoundMark Interface is required), etc. The controller conforms to the UK Highways Agency specification TR2500.
ST900 Family General Handbook 2.
ST900 Family General Handbook Figure 3 – ST900 Controller Cabinet showing new equipment 667/HB/32900/000 Issue 12 Page 22 of 265
ST900 Family General Handbook 2.3 ST900 Controller Rack Figure 4 – The ST900 Rack (General Arrangement) Note that a standard 20A UK power distribution unit is shown in Figure 4; other variants including a 30A variant and The LED variant of the distribution unit as well as non-UK variants are also available.
ST900 Family General Handbook 2.3.1 ST900SE Small Controller Rack ST900SE MAINS DISTRIBUTION UNIT ST900S SIEMENS FOUR PHASE ST900 LAMP SWITCH CARD T MAIN PROCESSOR CARD OTU CARD Figure 5 – ST900SE The ST900SE is a small controller intended for use outside the UK. It uses an 11” rack and its Lamp Switch cards do not include any lamp monitoring. 2.
ST900 Family General Handbook 2.5 Mains Input When considering the connection of the controller to the incoming WARNING mains supply, it is important to verify from the supplier that the mains supply short-circuit current does NOT exceed 16,000 Amps. If the mains supply short-circuit current can exceed 16,000 Amps, refer to Siemens Poole for further information. The Master Controller Switch is a double-pole isolator and this must WARNING be switched off before replacing the Master Controller Fuse. 2.5.
ST900 Family General Handbook The two RJ-45 connectors on the PHS card marked “IO” are used to connect to the Intelligent Detector Backplanes and IO cards. It is not important which connector is used for the IO and which is used for the Intelligent Detector Backplanes. 2.
ST900 Family General Handbook 2.9 Intelligent Detector Backplane The Intelligent Detector Backplane provides an interface for up to 4 Loop Detector Cards, each Loop Detector Card connecting to up to 4 loops. The Intelligent Detector Backplane connects to the PHS or previous Intelligent Detector Backplane via a high-speed serial cable through which the card also obtains its logic power supply. Note that the Loop Detector cards themselves are powered from a separate supply – see section 2.11.4.
ST900 Family General Handbook 2.10 Maximum Number of I/O Cards and Intelligent Detector Backplanes The total number of I/O cards and Intelligent Detector Backplanes that can be fitted to the ST900 Controller is limited by the current capability of the power supply fitted to the MDU. See Table 2 for details on the mix of cards that can be fitted to the controller.
ST900 Family General Handbook Number Of Maximum Maximum Maximum Maximum Backplanes Number Of Number Of Number Of Number Of Outputs Inputs Loops Required I/O Cards 0 4 0 96 64 1 4 16 96 64 2 4 32 96 64 3 3 48 72 48 4 3 64 72 48 5 3 80 72 48 6 2 96 48 32 7 2 112 48 32 8 2 128 48 32 9 1 144 24 16 10 1 160 24 16 11 1 176 24 16 12 0 192 0 0 13 0 208 0 0 14 0 224 0 0 If an IRM/IMU Card is fitted and powered from the +24V DC Supply, then the power available for the I/O Cards and Backplanes is reduced.
ST900 Family General Handbook 2.11 Controller Load Power Consumption & Dimming Transformer Selection This section describes the method used to determine that the controller can supply the total lamp load required, how to select the correct dimming transformer and how to determine the overall power used for estimation of site running costs. In order to do this, the power taken by the lamps needs to be calculated. Use the following table to determine the average power taken by the different types of lamps.
ST900 Family General Handbook Note 1. The power ratings in table 3 above allow for the additional losses in the transformers required (described below). These power ratings are indicative for the purpose of selection of the correct size of dimming transformer.
ST900 Family General Handbook 2.11.2 Lamp Drive Capability The following table gives the lamp drive capability of the controller as a whole, each ‘Phase Driver’ (or ‘Lamp Switch’) card and each aspect. The ‘Watts’ and ‘Lamps’ columns are equivalents for the currents shown based on a 230V supply. It must be noted that up to date information for Helios LED and Nearside units and be found in the Helios General handbook 667/HB/30000/000.
ST900 Family General Handbook (which are limited to 10A). The total controller load (including regulatory signs and the maintenance socket) is limited to 45A. This option also uses a 3kVA dimming transformer, see section 2.11.3. Note 2: The ST900LED controller is not intended to be used with Halogen signals. If Halogen signals are used the main limiting factor is the Supply power available in Dim. 500VA represents just 15 Halogen loads.
ST900 Family General Handbook Key: Traffic Red / Amber / Green Signal (Main) Traffic Red / Amber / Green Signal (Seconda Pedestrian Red / Green Signal. C C D Pedestrian Wait Indicator Box (on pole).
ST900 Family General Handbook 2.11.3 Selection of Dimming Transformer In order to select the correct dimming transformer, the total average signal Lamp Power is required. See Table 3 on page 30 for the power taken by the different types of lamps. When selecting the dimming transformer the peak lamp power is not used as the transformer can withstand the overload for the 2 second Red / Amber period. Thus for the average power consumption, it is assumed that only one lamp is illuminated on each signal head.
ST900 Family General Handbook Intersection’s Power Requirements for Running Costs Estimate 2.11.3.1 Introduction The following worked example is based upon a 230/240V mains’ supply. Firstly the Total average lamp power for the junction is calculated. Secondly the Total average lamp power is added to the Total average controller power. This gives the Total average junction power, which a local authority may use to estimate running costs. Total Average Junction Power 2.11.3.
ST900 Family General Handbook 2.11.3.4 Total Average Junction Power For the total average junction power to aid local authorities with running cost estimates, the total average lamp power must be added to the controller average power.
ST900 Family General Handbook maximum number of each type of detector that can be supported by each type of transformer is shown in the table below. In the ST900 controller, the MDU is not used to power any Loop Detector Cards. 667/1/27853/00 0 50VA / 2.0A 667/1/20292/00 8 160VA / 6.6A Note Siemens ST4R/ST4S (2.
ST900 Family General Handbook 2.11.5 Audible Supplies The Audible power supplies on the ST900 are designed to provide a DC voltage between 10V and 24V, and typically provide 50mA at 18V DC. This is provided using the Audible Supply Kit. See the ST900 Installation, Commissioning and Maintenance Handbook for more details. This kit also provides the controlling signal for ‘Tactile Power Supplies’. The tactile power supply obtains its power directly from the pedestrian green drive.
ST900 Family General Handbook 2.12 Outercase The ST900 Outercase is a single sided access cabinet with the following dimensions: Height (above ground level) Width Depth Approximate weight of bare outercase Approximate weight with a 16-phase controller 1160mm 725mm 420mm 30Kg 75Kg Table 7 – Size and Weight of ST900 The case is manufactured in grey or black powder coated aluminium. In addition to the screw-locks, the main controller door is fitted with a S18 lock.
ST900 Family General Handbook 3 ST900 ELV CONTROLLER The Siemens ST900 ELV Controller is a mains-powered ELV Traffic Controller which drives and monitors 48V LED signals and meets the requirements of Protective Extra-Low Voltage (PELV). The system is optimised for safety, reduced cabling costs, reduced operating and maintenance costs and extreme reliability in operation. The ST900 ELV Controller is designed so that there are no on-street voltages that exceed the nominal ELV limit of 50V.
ST900 Family General Handbook and connect to Backplanes that allow direct termination of the street cabling, avoiding the use of termination blocks and soft wire kits. An HPU card distributes the 48V lamp supply from the Lamp Supply Transformer to the LSLS cards and incorporates the Dim/Bright, A and B relays. The Main Processor Card is now coupled with a daughter card (the PHS card) that in turn provides high-speed serial connection to new LSLS Cards, IO cards and new Intelligent Detector Backplanes.
ST900 Family General Handbook Figure 7 – ST900 ELV System Overview 667/HB/32900/000 Issue 12 Page 43 of 265
ST900 Family General Handbook 3.
ST900 Family General Handbook LSLS3 HPU Lamp Supply Transformer Figure 9 – ST900 ELV Controller Cabinet – View of left side Figure 10 – ST900 ELV Cabinet arrangement with swing frame open 667/HB/32900/000 Issue 12 Page 45 of 265
ST900 Family General Handbook 3.3 ELV Controller Expansion Cabinet For large junctions, it may be necessary to fit an expansion cabinet, adjacent to the primary cabinet. The Expansion Cabinet Kit does not have a connection to the mains supply and is typically used to house IO cards and their associated cabling. Long-length serial cables are used to connect the IO cards in the expansion cabinet to the PHS in the primary cabinet.
ST900 Family General Handbook Figure 11 – ST900 ELV Rack for fitting in Alternative Cabinets (front) Figure 12 – ST900 ELV Rack for fitting in Alternative Cabinets (rear) 667/HB/32900/000 Issue 12 Page 47 of 265
ST900 Family General Handbook 3.5 Mains Input When considering the connection of the controller to the incoming WARNING mains supply, it is important to verify from the supplier that the mains supply short-circuit current does NOT exceed 16,000 Amps. If the mains supply short-circuit current can exceed 16,000 Amps, refer to Siemens Poole for further information. The Master Controller Switch is a double-pole isolator and this must WARNING be switched off before replacing the Master Controller Fuse. 3.5.
ST900 Family General Handbook 3.7 HPU 3.7.1 Introduction The High Power Unit (HPU) is mounted on the left hand side panel of the controller, above the lamp supply transformer. The HPU (High Power Unit) receives all the AC voltages from the transformer secondary windings and develops rectified, unsmoothed DC supplies for the LSLS Cards, Reg. Signs and Detectors. All these supplies have a positive connection to Earth, and are therefore negative DC supplies with respect to Earth.
ST900 Family General Handbook 3.7.
ST900 Family General Handbook 3.8 LPU The LPU (Logic Power Unit) is powered by the Mains 230V AC supply (or by the Mains 110V AC supply, when the ELV transformer is wired for 110V or 120V input). A switch-mode power supply mounted in the LPU produces +5V and +24V DC supplies used by cards within the cabinet. These supplies are never taken outside the cabinet. The following supply voltages may be used: Minimum Maximum Nominal Voltage Voltage Voltage 3.
ST900 Family General Handbook 3.10 Serial I/O Card The I/O card provides a rugged interface for up to 24 digital inputs and 16 changeover outputs for the connection of pushbuttons and above ground detectors, or to provide a free-standing UTC Interface or for linking between controllers. A sub-equipped variant of this card is also available, fitted with only 4 changeover outputs.
ST900 Family General Handbook 3.12 Maximum Number of I/O Cards and Intelligent Detector Backplanes Number Of Maximum Maximum Maximum Maximum Backplanes Number Of Number Of Number Of Number Of Outputs Inputs Loops Required I/O Cards 0 8 0 192 128 1 8 16 192 128 2 8 32 192 128 3 7 48 168 112 4 7 64 168 112 5 7 80 168 112 6 6 96 144 96 7 6 112 144 96 8 6 128 144 96 9 5 144 120 80 10 5 160 120 80 11 4 176 96 64 12 3 192 72 48 13 2 208 48 32 14 1 224 24 16 15 0 240 0 0 Without an IRM/IMU Card fitted.
ST900 Family General Handbook card has no impact on the above table. The sum total number of inputs and outputs cannot exceed 248. 3.13 LSLS The LSLS card provides 32 current and voltage monitored switched outputs to the ELV signal aspects. Each LSLS card is fitted into an LSLS backplane on the side panels of the cabinet. A maximum of 3 LSLS cards can be fitted into an ST900 ELV Controller cabinet. Another 3 LSLS cards can be fitted into an adjacent cabinet, controlled by the same ST900 ELV Controller.
ST900 Family General Handbook 3.14 Controller Load, Power Consumption and Lamp Supply Transformer Selection This section describes the method used to determine that the controller can supply the total lamp load required, how to select whether one or two lamp supply transformers are required, and how to determine the overall power used for estimation of site running costs. In order to do this, the power taken by the lamps needs to be calculated.
ST900 Family General Handbook 3.14.2 Lamp Drive Capability The following table gives the lamp drive capability of the controller as a whole, each ‘Phase Driver’ (or ‘Lamp Switch’) card and each aspect. The ‘Watts’ and ‘Lamps’ columns are equivalents for the currents shown based on a 48V supply and 12W Siemens Helios ELV Signals respectively. Max Max No. of Current Power LED (Amps) (Watts) Lamps Max.
ST900 Family General Handbook 3.14.
ST900 Family General Handbook 667/SU/32900/000 for information on the compatible versions. When signals are required to be lamp monitored, signal types IMPORTANT must not be mixed. Specifically, when lamp monitoring Nearside Signals, it is not allowed to connect Tactile Units or Audible Driver Modules in parallel to the Nearside Signals.
ST900 Family General Handbook 3.14.5 Selection of Lamp Supply Transformer In order to select the number of lamp supply transformers, the total average signal Lamp Power is required. See Table 10 on page 55 for the power taken by the different types of lamps. When selecting the lamp supply transformer the peak lamp power is not used as the transformer can withstand the overload for the 2 second Red / Amber period.
ST900 Family General Handbook at any one time. Since the short 2 second Red plus Amber period never occurs on many signals at the same time, the transformer is designed to cope with a short period of overload. A range is given because of the range on the number of phases; e.g. 9 phases would allow an average of 10 signal heads per phase, but with 16 phases this drops to an average of five signal heads per phase.
ST900 Family General Handbook Therefore for our theoretical junction (Figure 13) the total average controller power is: 3.14.6.4 1 x Controller 40W 2 x Siemens ST4R/ST4S Detectors 6W Total Average Controller Power is: 46W Total Average Junction Power For the total average junction power to aid local authorities with running cost estimates, the total average lamp power must be added to the controller average power.
ST900 Family General Handbook 667/1/33075/000 -24V DC 50VA / 2.0A 667/1/33074/000 -24V DC 160VA / 6.6A Siemens ST4R/ST4S (2.4W / 100mA per detector) Sarasota MTS36Z or MTS38Z (or any mix) (3W / 125mA per detector) Microsense Detectors (6W / 250mA per detector) HPU -24V DC 2.8A detector power supply kit. The maximum number of each type of detector that can be supported by each power supply is shown in the table below.
ST900 Family General Handbook 3.14.8 Audible Supplies The ELV Audible Driver Module derives the power to drive the Audible sounders directly from the green drive of the LSLS card. Audible sounders used must operate correctly over the voltage range 10 to 24V DC. The audible units recommended and supplied by STC, which meet this requirement, are: Highland Electronics type SC628P (was Sonalert Mallory SC628P), Roxborough type SPCI535A4 and Askari (Tone 22 – variable volume)… ELV Audible: 667/4/04785/000 3.14.
ST900 Family General Handbook either a separate pedestrian phase must be configured to run in parallel with the usual pedestrian phase, but with the required timings modified or a tactile with an enable input must be used. Tactiles with an enable input can be disabled during the period that the green drive is on. Typically this is used to terminate the tactile cycle after a shorter period than the green drive period.
ST900 Family General Handbook 3.14.10 ELV Regulatory Sign Expansion Kit The ELV Regulatory Sign Expansion Kit derives power from the controller mains supply to power additional ELV regulatory signs. This kit is required if the total number of regulatory signs to be driven from the controller exceeds the HPU capacity of 8. ELV Regulatory Signs must operate from 33 to 58VDC rectified supply, measured at the ELV Regulatory Sign terminal block.
ST900 Family General Handbook 3.15 Cabling When estimating cable core and controller equipment requirements for the ST900 ELV Controller the maximum cable lengths defined in the following tables on pages 69 and 70 must be complied with. The voltage drop in the installation must be no more than 4% of the incoming supply. The tables should be consulted to ensure that the voltage drop is lower than this maximum for the selected core size and loading.
ST900 Family General Handbook Common return cable for all BUT green aspect: 24W (6W+18W) at 180 metres = 3 cores Green aspect return cable 12W at 180metres = 2 cores 4. If required to minimise core usage it is permissible to common signal returns on the same pole as long as the total lamp load dependent on that return is considered and the cable length limitations defined in the table are observed.
ST900 Family General Handbook lengths using the table, each tactile unit should be considered to be a 12W load. If required to reduce core usage, tactile units may share a return core with any Red/Amber LED signal return core on the same pole (NOT green as this must always have its own return). If this option is exercised each tactile should be considered to be a 45W load for the purposes of assessing acceptable cable run lengths using the table.
ST900 Family General Handbook NO MORE than 3 cores should be connected in parallel. The numbers in the cells within the tables indicate the number Note of cores required to meet the voltage drop requirement. 10m 15m 20m 25m 30m 35m 40m 45m 50m 60m 70m 80m 90m 100m 110m 120m 130m 140m 160m 180m 200m 225m 250m 275m 300m 325m 350m 375m 400m 7W 10 W 12 W 18 W 20 W 25 W 30 W 35 W 40 W 45 W 50 W 60 W 80 W 100 W 120 W 5m Lamp Load (Watts) 2 Length of Cable Run (metres) – 1.
ST900 Family General Handbook 10m 15m 20m 25m 30m 35m 40m 45m 50m 60m 70m 80m 90m 100m 110m 120m 130m 140m 160m 180m 200m 225m 250m 275m 300m 325m 350m 375m 400m 7W 10 W 12 W 18 W 20 W 25 W 30 W 35 W 40 W 45 W 50 W 60 W 80 W 100 W 120 W 5m Lamp Load (Watts) Length of Cable Run (metres) – 1.
ST900 Family General Handbook 3.16 Outercase The ST900 ELV Outercase is a single sided access cabinet with the following dimensions: Height (above ground level) Width Depth Approximate weight of bare outercase Approximate weight with single HPU and Lamp Supply Transformer 1160mm 725mm 420mm 30Kg 85Kg Table 18 – Size and Weight of ST900 ELV The case is manufactured in grey or black powder coated aluminium. In addition to the screw-locks, the main controller door is fitted with a S18 lock.
ST900 Family General Handbook 4 GENERIC SPECIFICATIONS 4.1 Controller Operation In common with the ST800, the ST900 and ST900 ELV Controllers are phase oriented. Timings and demands are associated with phases and the control philosophy is designed to give right-of-way to phases in an optimum manner. It is necessary to group phases into stages for Manual Control, operation in Urban Traffic Control Schemes and in Cable-less Linking Schemes.
ST900 Family General Handbook connected to the controller’s handset port, the ST900 controller configuration utility IC4 loads the configuration data into the controller, negating the need for an EPROM. In the UK some timings considered to be fixed timings cannot be changed by handset, these are typically the Amber and Red/Amber periods. These timings can, however, be specified as alterable at configuration time to suit other signal sequences, non UK requirements etc.
ST900 Family General Handbook Lower Limit (sec) Upper Limit (sec) Resol’n (sec) Config’ble Lower Limit Config’ble Upper Limit 0 255 1 1 per timer 1 per timer 0 0 255 255 1 1 1 value 1 value 1 value 1 value 0 0 0 255 255 255 1 1 1 1 value 1 value 1 value 1 value 1 value 1 value 0 500 2 1 per timer 1 per timer 0 255 1 1 per timer 1 per timer Detector Timing Period Call delay period Cancel delay period Detector Fault Monitoring1 0 0 1 255 255 254 1 1 1 1 value 1 value Priori
ST900 Family General Handbook 4.4.1 Tolerance All timings, except CLF and Master Time Clock, are derived from the crystal frequency which has a tolerance of 35 parts per million. An additional error due to random signals not being synchronised to the clock pulse may add up to 200mS to the time. If the result of the above timings is required to change the signal lamps, a further error may occur, which may be up to a maximum of 21mS.
ST900 Family General Handbook 4.7 Handset Interface (RS232 Port) Access to the ST900 timings and status information is gained by entering commands on an approved handset or PC and interpreting the response on the display. The connection for the handset is a ‘25-way D-Type’ to RS232C CCITT V24 / V28. The handset link runs at 1200, 9600 or 19200 baud and supports either 7 Data Bits with an Even Parity bit (7E) or 8 Data Bits and no parity (8N).
ST900 Family General Handbook 5 STAGES 5.1 Facilities There are up to 32 stages (0 to 31) available for use. Stage 0 is normally used as a manual all-red facility. It may be used as a traffic stage. Stage 1 normally is the start-up stage and must not be deleted. Some stages may appear in some modes but not others.
ST900 Family General Handbook Change Facility” allows the controller to look for a new stage while the controller is still moving between two stages. In order to select the next stage, the “SUGGESTED STAGE”, the controller goes through the following decision-making process. Firstly, the controller sets the “suggested stage” as the current stage and the number of new “phases & stages to get right of way” to ‘none’.
ST900 Family General Handbook If NO, add the demanded phases in this stage (or the stage itself if the stage is demanded) to “Phases & stages to Get right of way”. Then try the next stage in cyclic order (starting at Step 1). 5. Will additional demanded phases be serviced by this stage compared to the previously “Suggested Stage”? If YES, set “Suggested Stage” equal to this stage.
ST900 Family General Handbook b) Masking out phase demands, c) Inserting stage demands, d) Masking out extensions, i.e. causing them to be ignored, e) Suspending maximum green times. Thus for the above-mentioned modes, specific stages may be requested, and the controller forced to serve them when required. 5.5.2 Usage of Stage Movement Restriction Tables The controller will always use the stage movement restriction table, applicable to the mode in which it is operating when it initiates the stage change.
ST900 Family General Handbook 5.6.3 Mode Selection Each stream will independently run the highest priority mode for which a request exists. Most modes will automatically only run on the streams which have active requests for phases and/or stages in those streams. For example, CLF mode will only run on the streams that the CLF plan affects. Each mode may be configured so that it is disabled on an individual stream using Special Conditioning. For more information on Mode Selection, see section 12. 5.6.
ST900 Family General Handbook 6 PHASES 6.1 Facilities There are up to 32 phases (A to Z and A2 to F2) available for use as any of the following types of phase: Traffic Pedestrian Green arrow, filter or indicative LRT vehicle Dummy Switched sign. Traffic, pedestrian and green arrow phases are considered as real phases and require phase hardware as well as phase software. Dummy phases require only phase software. As no phase hardware is required the dummy phases are allocated after the real phases.
ST900 Family General Handbook 6.2.2 Pedestrian Phase A pedestrian phase controls pedestrian movements via a 2-aspect signal comprising red and green man plus a WAIT indicator normally driven from the amber aspect. The standard signal sequence is as follows: at no ROW at ROW changing to no ROW at no ROW - RED MAN GREEN MAN BLACKOUT RED MAN Alternative signal sequences, e.g. RED MAN - GREEN MAN - AMBER MAN, or RED MAN - GREEN MAN - FLASHING GREEN MAN, or others may be obtained if required.
ST900 Family General Handbook Note: it is a requirement in the U.K. that if audible and/or tactile indications are fitted, the controller must also include the Red Lamp Monitoring facility, see section 38.2. 6.2.2.2 High Voltage Audible Indication (Not UK) The audible signals are driven direct from the aspect supply to the pedestrian red and green signals via relay contacts. An I/O port can be used to drive a relay to disconnect the red and green feeds to the audible signal when it is not required.
ST900 Family General Handbook Alternatively, it can remain illuminated during the green of its associated phase and extinguish at the commencement of the amber leaving. For safety reasons in the U.K., a filter green arrow must always be followed by the green of its associated phase. To achieve this, a demand dependent filter green arrow must also demand its associated phase.
ST900 Family General Handbook 6.2.6 Switched Sign Aspect A switched sign aspect is an aspect of a hardware phase that is not allocated to a stage but is illuminated and extinguished at certain times of day or when specific conditions occur. The normal functions of a switched sign aspect are as follows: 6.2.6.1 Secret Regulatory Signs Secret regulatory signs, e.g. “No Right Turn”, “No Left Turn”, etc. are illuminated and extinguished at a certain time of day when a specified associated phase loses ROW. 6.
ST900 Family General Handbook Opposing phases that gain right of way at the same time will not start each other’s maximum green timers since the demands for those phases are disregarded while they are at right of way. Therefore, each phase is usually configured to ‘oppose’ all the other phases (in the same stream) to guarantee that the maximum green timers for the phases at right of way are started whenever there is a demand for a phase not at right of way. 6.
ST900 Family General Handbook A stage change will not take place until the minimum green times for all phases that need to terminate have timed off. The timing range is 0 to 255 seconds in 1-second steps. There is one minimum green time and one set of range limits for each phase. 6.5.2 Green Extension (EXT or IPX) When a ‘vehicle actuated’ phase (i.e.
ST900 Family General Handbook 6.5.3 Maximum Green (MAX, MBX etc to MHX) A maximum green timer is provided for each ‘vehicle actuated’ phase and commences to time upon receipt of a demand for any opposing phase. If opposing demands are present when the phase gains ROW, the maximum green period will commence to time off immediately.
ST900 Family General Handbook The timing range is 0 to 255 seconds in 1-second steps and there is one time for each phase. If no blackout/flashing green is required the timer should be set to 0 seconds. 6.5.5 Red Amber Time (RAT) The red/amber ‘gaining right of way’ step for traffic phases is fixed at 2 seconds of red/amber for all UK controllers. However, the ‘gaining right of way’ step for traffic phases can be configured differently for non UK controllers.
ST900 Family General Handbook The timing range is 0 to 199 seconds in 1-second steps with one time and minimum range limit for each phase-to-phase transition. See section 6.11 for information on the inter-greens to and from pedestrian phases. 6.5.8 Starting Inter-green (IGS) The starting inter-green period is a safety period in Start-up Mode before any phases gain ROW – see section 13. The timing range is 0 to 255 seconds in 1-second steps with one time for the whole controller. 6.5.
ST900 Family General Handbook If the limit green override code is sent from the ATC computer during computer stage control mode, the limit green watchdog timer is held reset. In the event of a limit green watchdog timer timing out before its associated phase green has terminated, the controller will then revert to the next highest priority mode configured for which a request exists and the fault will be logged.
ST900 Family General Handbook When the phase appears its timing periods will be considered for the stage duration. Therefore, if the phase appears during the stage its minimum green period, and possibly maximum green period, may affect the termination of the stage. Therefore this type should only be used if essential. Appearance Type 3 should be used unless the phase is a filter green arrow. The normal use for this type of condition is a filter green arrow phase.
ST900 Family General Handbook The timing range of the window period is 0 to 255 seconds in 1-second steps. There is one time for each stage. The programmed value of the window timer may be changed via the handset using the PWN command. With Appearance Types 1, 2 and 3, the appearance or non-appearance of the phases may affect the inter-green periods following the stage termination.
ST900 Family General Handbook 6.9.3 Termination Type 2 The phase terminates when a specified associated phase loses ROW. The associated phase must be a fixed phase. The normal use for this type of phase is an indicative green arrow. 6.10 Early Termination of Phases Once a phase has gained ROW in a stage it cannot normally be terminated before the end of the stage. If early termination of a phase is required, usually for a pedestrian phase, it can be achieved by using two consecutive stages.
ST900 Family General Handbook The following table summarises the facilities of the various types of pedestrian crossing available. Type of Crossing Stand-alone Pelican Ped. Signal Position Far-side Veh To SDE/SA Ped to Veh Ped to Veh On-Crossing Kerbside Ped I/G Clearance Clearance Display Timings Detectors Detectors UTC Type (6.11.4) (see 9.4.2) (6.11.1 - 6.11.3) (6.11.1 - 6.11.3) (see 7.3.4) (see 7.4) (see 15) PAR 3 Flash Amber Veh. Flash Green Ped.
ST900 Family General Handbook 6.11.1 UK ‘Pelican’ Crossing A UK ‘Pelican’ crossing is a stand-alone pedestrian stream containing one vehicle and one pedestrian phase. The vehicle phase may control the signals of one or more vehicle approaches. The signals normally reside at vehicle green and pedestrian red. The controller responds to pedestrian push-button demands that cause the vehicle phase to move to red and the pedestrian phase to appear at green.
ST900 Family General Handbook The vehicle to pedestrian inter-green on a stand-alone crossing is again controlled by PAR, however if the far-sided pedestrian phase is part of an intersection stream, this period is controlled by the IGN inter-green command. See section 6.11.4 for more information on the vehicle to pedestrian inter-green.
ST900 Family General Handbook The far side pedestrian lamp sequence includes an extendable blackout period that extends the inter-green time between the pedestrian phase and any conflicting vehicle phases.
ST900 Family General Handbook 6.11.3 Near Side Pedestrian Crossing This type of crossing can be used at both intersections and at stand-alone pedestrian crossings (also known as ‘mid-block’ crossings). The pedestrian signals are mounted on the ‘near side’ of the crossing, i.e. on the same side of the road as the pedestrian. When the pedestrian green finishes, these signals immediately show red, even though a clearance period still delays the appearance of any conflicting vehicle phases.
ST900 Family General Handbook The near side pedestrian sequence includes an extendable all-red period which extends the inter-green time between the pedestrian phase and any conflicting vehicle phases.
ST900 Family General Handbook However, if the configured inter-green time to one vehicle phase on an intersection is increased to say seven seconds (VEH2), it controls the actual inter-green time and thus delays the vehicle phase by an extra one second. Note that the vehicle is always delayed by one second, regardless of how long the extendable period actually runs for, and so always appears one second later than the other vehicle phase. 6.11.
ST900 Family General Handbook vehicle period mode (see section 23.3) and for a ‘linked’ changed, UTC, local link or CLF. However, if the speed discrimination or speed assessment facility is enabled on the stream (because of the higher speed of the traffic), the all-red time runs for at least 3 seconds in order to meet UK requirements. Also see section 9.4.2. 6.11.
ST900 Family General Handbook time that the vehicle phase terminates. In this instance, the next phases starting would be controlled by the vehicle-to-vehicle inter-greens, rather than those defined for the pedestrian. 6.11.
ST900 Family General Handbook 7 DEMANDS AND EXTENSIONS 7.1 General Description Demands may be inserted for phases or stages, but extensions may only be inserted for phases. Demands will only be acted upon when the phase or stage is not at right of way and request (i.e. demand) that the phase / stage gains right of way. Extensions will only be acted upon when the relevant phase is at right of way and will request that the phase remains at right of way for longer. 7.2 Types of Demands 7.2.
ST900 Family General Handbook 7.3.2 Pedestrian Push-Buttons When a pedestrian push-button is pressed, a ‘latched demand’ is inserted for the pedestrian phase that will give right of way to the pedestrian and the associated WAIT indicator(s) are illuminated. See section 7.4 for more information. If it is required, it is possible to illuminate the WAIT indicator without inserting a demand or conversely insert a demand without illuminating the WAIT indicator. Also see section 24.
ST900 Family General Handbook 7.3.6 UTC Demand Bits These provide simulated on-street demands and/or extensions from the UTC computer. In the case of pedestrian demands, the WAIT indicator will be illuminated on receipt of the demand unless specifically requested otherwise. 7.3.7 Conditions Occurring When demands and/or extensions are required to be inserted when certain conditions occur, rather than the operation of detectors.
ST900 Family General Handbook SPECIAL CONDITIONING READ/WRITE ACCESS PUSHBUTTON ACTIVE (ENG 254) OR NOT SET KERBSIDE ACTIVE ROW CLR KBSACT OR x4 LATCHED PUSHBUTTON PBNLAT (ENG 284) (ENG 255) ALL KERBSIDES INACTIVE PUSHBUTTON & KERBSIDE LATCH SET PBKLAT (ENG 256) LATCHD 1WTCTRL (ENG 197) CLR OR ROW VARIOUS FACILITIES UNLPUF PDX OR DEMAND BUT NOT KERBSIDE NOT IPX AND PED DEMAND PROCESSING PHASE DEMAND PROCESSING OR PEDBUT OR (ENG 29) LATCHED PHASE DEMANDS OR WAIT / DEMAND IND
ST900 Family General Handbook 7.4.2 Pedestrian Demand Acceptance For the purposes of this section, push button inputs include any demand inputs assigned to a pedestrian phase, including for example inductive loops for cycles. If no kerbside detectors are configured on the phase, pressing the push buttons generates a latched demand for the pedestrian phase, which is only cleared when the pedestrian phase gains right of way.
ST900 Family General Handbook In VA mode, if no real phases in the same stream are at right of way, the delay is introduced, so delaying the appearance of the pedestrian green after a quiescent all-red period, for example. In all other modes, the delay will always be introduced. This is to cater for cases such as ‘fixed vehicle period’ mode, UTC inserting a demand dependant force for the pedestrian phase, or CLF introducing a demand dependant move just after the push-button is pressed.
ST900 Family General Handbook as faulty, the DFM indicator is illuminated and the detector input forced active (regardless of the setting of the DFM forcing action command ‘DFA’). * Note that for the input to be seen inactive at the 200ms processing rate, all ten 20ms samples must have been inactive. Thereafter, the force is only removed after 5 consecutive tests of the detector have passed, but the fault log entry remains set and the DFM indicator remains illuminated, until RFL=1 is entered.
ST900 Family General Handbook 7.5.3 CLF Mode Extensions are disregarded during CLF mode. However, it is possible to configure demand dependant moves to stages during CLF. This is achieved by selecting the group influence as a demand dependant move to a stage and specifying the stage. See section 21 for more information. 7.5.
ST900 Family General Handbook 8 CALL/CANCEL There are up to 8 call/cancel units (0 to 7) available which may be used for turning movements or in conjunction with queue loops or switched facilities. The input to a unit must remain active for the call period before the output goes active and inactive for the cancel period before the output returns to the inactive condition.
ST900 Family General Handbook 667/HB/32900/000 Issue 11 Page 114 of 265
ST900 Family General Handbook 9 HIGH SPEED VEHICLE DETECTION To provide this facility, specially positioned vehicle loops are required. These should be connected to the Controller through the normal serial I/O cards or Intelligent Detector Backplanes. The SDE/SA facility is fully integrated in the Controller, but if the SoundMark interface socket is required for test purposes, a separate SDE/SA processor card may be used.
ST900 Family General Handbook Two assessors are used, an outer and an inner. The outer is situated 159 metres from the stop line and the inner 91 metres. The outer assessor has a threshold velocity of 45mph / 72kph and the inner 35mph / 56kph. Each assessor provides a fixed extension period normally of 3.5 seconds for vehicles exceeding the threshold velocity. Stop Line 159m 91m Z Y X Standard ‘D’ Detector 12’ (3.66m) 12’ (3.66m) Figure 24 – Triple SDE Layout 9.
ST900 Family General Handbook 9.4 SDE/SA Actions 9.4.1 SDE/SA Green Extensions The SDE/SA facility provides green extensions that hold the associated phase(s) at right of way until the vehicle reaches the normal detectors. Sections 9.1 and 9.2 describe the extensions provided the SDE and SA facilities. An SDE/SA extension may be suppressed, but not the associated extra clearance, using Special Conditioning.
ST900 Family General Handbook Note that if the inter-green is not dependent on the SDE/SA phase inter-green time (because another losing phase has a longer inter-green time), the extra clearance period may not actually delay the appearance of the gaining phase. Also note that the inter-green from the vehicle phase to the pedestrian phase on a stand-alone pedestrian stream is fixed at three seconds of all red if the SDE/SA is configured, regardless of the PAR value (see section 6.11.4).
ST900 Family General Handbook 10 ALL-RED DISPLAYS There are three methods of achieving an all-red display: By using an ‘all-red’ stage. By using the ‘extend all-red’ facility. By using ‘on-crossing detectors’ on a near side pedestrian phase. An All-Red Stage is a stage during which all signal phases are ‘at no right of way’ and thus display their red signal aspects. This is covered in section 10.1.
ST900 Family General Handbook 10.2 Red Extension During Interstage 10.2.1 Description The occupation of an All Red detector loop during its specified stage to stage movement will generate an All Red extension. When using priority mode to provide priority facilities for Light Rail Transit schemes, the priority demands (LRV requests) can be used to extend the all Red period.
ST900 Family General Handbook Care must be taken when using/testing independent inter-greens since the Extend All Red facility terminates when the gaining stage comes to fruition (i.e. when all fixed phases are at right of way) since the controller is no longer in an interstage. Therefore problems may arise when the inter-greens to all fixed phases are configured as independent and it is the inter-green to one or more non-fixed phases which are to be delayed by the All Red Extensions.
ST900 Family General Handbook 11 PHASE DELAYS 11.1 General Description In order to gain more efficient use of phases during stage to stage transitions, it may be required to delay specific phases from losing or gaining ROW. There are up to 120 phase delay times (0 to 119) available for different phases on different stage to stage transitions. The timing range is 0 to 255 seconds in 1-second steps.
ST900 Family General Handbook (a) ...Stage 1 Interstage is 6s A AMBER B AMBER Stage 2... R/A E R/A F Intergreen from Phase A to Phases E and F is 6 seconds. Intergreen from Phase B to Phases E and F is 5 seconds. (b) ...Stage 1 Interstage still 6s Stage 2... AMBER A AMBER B R/A E R/A F Phase B is delayed by 1 second. Intergreen from Phase A to Phases E and F is 6 seconds. Intergreen from Phase B to Phases E and F is 5 seconds. Key: ...GREEN AMBER ...RED... R/A GREEN...
ST900 Family General Handbook 11.3 Phases Gaining Right-Of-Way The inter-green times from conflicting phases determines at which point a phase gains ROW. If phases gaining ROW have different inter-green times from a conflicting phase, they will gain ROW at different points. The time differences will be the same every time the phase to phase transition occurs regardless of the stage to stage transition.
ST900 Family General Handbook …Stage 2 Stage 4… A AMBER C AMBER 4 Second Phase Delay R/A E R/A F If phases E and F are required to always appear at red/amber and then green together, a gaining phase delay can be used to delay the appearance of phase E. If phase E is delayed by 4 seconds on the move from stage 2 to stage 4, phases E and F would appear at the same time. Also see section 11.4 below… 11.
ST900 Family General Handbook For example, if the entries 0 to 9 were already allocated and we needed to set-up another phase delay which delays phase E for 4 seconds on the move from stage 2 to stage 4, we would enter: DFZ 10=E 11.6 DPG 10=4 DMF 10=2 DMT 10=4 Effect of Red Extensions and SDE/SA During the All Red Extension period (see section 10.2) or the SDE/SA extra clearance period (see section 9.4.
ST900 Family General Handbook 12 MODES The following modes are available: Start Up ..................................................................................... see Section 13 Part-time (Off period) ................................................................. see Section 14 Urban Traffic Control including MOVA ........................ see Sections 15 and 36 Emergency Vehicle and (Bus) Priority Modes ........................... see Section 16 Hurry Call .......................................
ST900 Family General Handbook Bus/LRT/Emergency Vehicle Priority mode: Entered if a request exists for priority from a special vehicle detector, (e.g. LRT request). Vehicle actuated or fixed time mode: Entered if a request does not exist for a higher priority mode. 12.1 Mode Priority The mode priority facility allows for the mode with the highest priority for which operating conditions are active (e.g. force bits from the UTC computer or a hurry call demand) to be the current mode.
ST900 Family General Handbook If when Fixed Time, CLF, VA or Manual has been selected, it is not a higher priority than the current mode, no change of mode will occur. EMERGENCY VEHICLE, HURRY CALL(S) and PRIORITY modes must always have a higher priority than VEHICLE ACTUATED mode (or FIXED TIME mode if there is no VEHICLE ACTUATED mode) but their priority above other modes is dependent on the required method of control of the intersection.
ST900 Family General Handbook 13 START-UP MODE The start-up mode is entered to produce a safe ‘signals on sequence’ when any of the following conditions occur: The AC supply to the controller is switched on or restored following a failure. The signals are switched on by means of the SIGNALS ON/OFF switch or the signals isolating switch (if fitted). This facility is optional.
ST900 Family General Handbook 13.1.1 Start-Up into Part-Time Mode If the first step of the start-up sequence matches the part-time state (e.g. both request blackout or the same flashing pattern), the controller will immediately enter the part-time state on power-up if it is requested (by the current time of day for example).
ST900 Family General Handbook 14 PART-TIME MODE 14.1 General Description When a stream is in ‘part-time’ mode, all the signals in the stream are usually extinguished allowing the traffic to flow normally. For example, it may be necessary to control the traffic on a roundabout only during peak times, but not during the rest of the day. The normal method of switching between normal operation and part-time mode is by means of the master time clock at specified times of the day.
ST900 Family General Handbook When part-time mode is no longer requested, i.e. when it is time for the controller to switch back on, the controller enters start-up mode to ensure normal operations resume in a safe manner, see section 13. 14.3 Part-Time Mode Parallel Stage Streaming Facilities Part-time mode can be active on any or all of the streams. Those streams not in part-time mode will continue to run a lower priority mode.
ST900 Family General Handbook 15 URBAN TRAFFIC CONTROL (UTC) 15.1 UTC Introduction In UTC mode, operations are controlled and monitored by the central computer of an Urban Traffic Control system. Stage changes are effected by the application of forces and demands. The demands may either be local or simulated by the computer. During UTC mode maximum green timers normally have no effect and are held in a RESET state.
ST900 Family General Handbook that the ‘normally closed contact’ is only opened (i.e. energised) when the required stage is at right of way.
ST900 Family General Handbook 15.3 Control and Reply Bits UTC Control Bits Bit Section Title F1, 15.3.1 Forces F2… DX D1, D2… 15.3.3 Demands: Common 15.3.3 Demands: Stage Bit G1, G2… UTC Reply Bits Section Title 15.3.2 Stage confirm SD1, SD2… 15.3.4 Stage demand confirm PX 15.3.3 Demands: Ped str’m WI 15.3.6 Wait indicator confirm PV 15.3.5 Ped str’m hold vehicle GX, PC 15.3.6 Ped str’m confirms SF1, SF2 15.3.7 Switch facility SC1, SC2 15.3.8 Switch facility confirm SO 15.3.
ST900 Family General Handbook 15.3.1 Forces (F1, F2 etc.) An ‘F’ control bit forces the controller to make an immediate move to the specified stage, subject to any minimum green or inter-green periods timing off and any stage movement restrictions. An ‘F’ bit may be demand dependent if required. If it is, the move will only occur if there is a demand for a phase within the specified stage.
ST900 Family General Handbook priority than UTC and would cause the computer to release control unnecessarily and then require computer operator intervention to restore UTC control. Ideally the other conditions should be used with an ‘MC’ or ‘RR’ reply bit (see section 15.4.4) although the availability of bits in the reply words will be the deciding factor. 15.3.3 Demands - Common (DX), Stage (D1, D2 etc.), Pedestrian (PX) The demand control bits simulate local demands, i.e.
ST900 Family General Handbook Note that the demand confirm bit for the pedestrian stage on a stand-alone stream is usually named ‘WI’ and returns the state of the wait indicator, see section 15.3.6. 15.3.5 Hold Pedestrian Stream Vehicle (PV) The ‘PV’ control bit is used on a stand-alone pedestrian stream to hold the vehicle stage at right of way. See section 27.3 for the description of the similar ‘PV1’ local link input.
ST900 Family General Handbook 15.3.9 Solar Switch Override (SO) An ‘SO’ control bit may be programmed to override the Signal Dimming facility (see section 29.8) and switch the signals to the BRIGHT condition. Also see section 27.3 which details how the ‘SO’ control bit can be used by a local link. 15.3.10 Solar Override Confirm (SC) An ‘SC’ reply bit may be returned to indicate that the signals are in the BRIGHT condition due to any of the following sources: a) the solar cell input (see section 29.
ST900 Family General Handbook 15.3.16 Local Link Inhibit (LL) An ‘LL’ control bit may be programmed to override the local link to an adjacent controller. Normally other control bits from the computer would then operate the link. 15.3.17 Local Link Inhibit Confirm (LC) An ‘LC’ reply bit may be returned to indicate that the Local Link is inhibited. 15.3.18 Fall Back Mode (FM) An ‘FM’ control bit normally causes the controller to disable CLF mode whilst the ‘FM’ bit is active.
ST900 Family General Handbook 15.3.23 RTC Synchronisation (TS1) A ‘TS1’ control bit may be programmed to cause the master time clock to be synchronised at 8, 18, 28, 38, 48 or 58 minutes past each hour. The synchronisation code is transmitted at 0101 levels, each level of 1-second duration. The central office computer has to be programmed to send the synchronisation code when its system clock indicates any of the times shown below.
ST900 Family General Handbook 15.3.27 Transmission Confirm (TC) The ‘TC’ input is not a transmitted control bit but an output from the OTU to the controller. Its presence indicates that valid transmission is being received from the central computer. No control bits are actioned unless ‘TC’ is active. Also see section 15.5. 15.4 Miscellaneous Reply Bits 15.4.1 Controller Fault (CF) A ‘CF’ reply bit may be returned to indicate that there is an entry in the controller fault log.
ST900 Family General Handbook 15.4.5 First Group Confirm (GR1) A ‘GR1’ reply bit may be returned to indicate that the first group, i.e. Group 0, of the current CLF plan is active, regardless of whether CLF is the current mode or not. Note that the first CLF group influence may not be configured to start at the beginning of the CLF cycle; compare and contrast GR1 with CYC which follows. 15.4.
ST900 Family General Handbook Under Option 2, all stages are demand and extension dependent. A stage change will not occur unless there are no extensions for the current stage or the ‘F’ bit is lifted and there is a demand for the next stage with or without an ‘F’ bit. (TCD 316) 15.7 Method of Plan Introduction Certain contracts require that the controller must synchronise with the Plan quickly.
ST900 Family General Handbook 15.10 UTC Parallel Stage Streaming Facilities UTC mode can be active on any or all of the streams. Each stream will normally enter UTC mode and respond to the force bits configured for stages in that stream independently of the other streams. If there are force bits present on any stream, the UTC active lamp will illuminate on the Manual Panel, if configured. The stage confirm bits, including the G1/G2 condition, are also stream based, see section 15.3.2.
ST900 Family General Handbook 16 PRIORITY AND EMERGENCY VEHICLE MODE 16.1 Introduction Priority and Emergency Vehicle modes provide a facility in which appropriate vehicles have priority in gaining and holding ROW over other vehicles. Selective Vehicle Detectors (SVD) or transponder interrogators which respond only to the appropriate type of vehicle, i.e.
ST900 Family General Handbook 16.2 Facilities Both Priority and Emergency Vehicle modes have the same facilities unless otherwise stated. These facilities and timings are listed below and can be accessed by the handset commands in brackets. 16.2.1 Priority Units (PUT) A Priority Unit can be regarded as a Priority Channel. The required phase is allocated to a Priority Unit. The phase can then be regarded as a Priority Phase. The Priority facilities, e.g.
ST900 Family General Handbook be used to generate a V.A. demand for the same phase such that if Priority mode is unavailable for any reason the phase will still be serviced. (N.B. Both priority demands and associated VA demands are latched. An Unlatched facility may be achieved by use of special conditioning.) If a Priority Demand is not required, it may be disabled so that only Priority Extensions are created.
ST900 Family General Handbook 16.2.8 Enforce VA Demands (PSE) This facility works on the same basis as ‘Allowed VA Demands’ except that VA demands for the specified phases are inserted to ensure that the specified phases will run. Note: This facility is not compatible with priority phases of type 2 appearance, i.e. if the stage in which the priority phase appears is active when a priority demand is received, the priority phase appears immediately.
ST900 Family General Handbook A priority demand stored during the ‘inhibit period’ will be cancelled if the demanded phase is served at the normal VA level during the ‘inhibit period’ (this will also cancel the ‘inhibit period’). The ‘Inhibit Period’ may be in the range 0 to 255 seconds in 1 second steps. 16.2.
ST900 Family General Handbook Time’ time range is 0 to 255 seconds in 1-second steps, and is sometimes referred to as the ‘Detection Interrupt Period’. If the input is inactive for less than the configured Gap Time, the timer for the Monitor Time continues to time, and the unit will be disabled if it expires. Only when the input has been inactive for longer than the Gap Time, is the timer for the Monitor Time reset and the Emergency Vehicle Unit no longer disabled. 16.2.
ST900 Family General Handbook ‘Good’ activations are activations of the priority input that do not remain active longer than the Monitor Time (PMT), each separated by a duration longer than the Gap Time (PVG). The values for priority DFM reset (PDR) are as follows: Zero means manual reset. 1 or 255 means Automatic Reset when input goes inactive. Any other value specifies the N’th activation on which the fault will be cleared and a priority demand accepted, e.g.
ST900 Family General Handbook 16.3.2 Changes from a Lower to a Higher Priority Level A change from Bus Priority mode to Emergency Vehicle mode will occur on receipt of a priority demand or extension for an Emergency Vehicle priority unit. A change from other lower priority modes to either Bus Priority or Emergency Vehicle mode (as required) will occur on receipt of a priority demand or extension for the priority unit.
ST900 Family General Handbook If the priority mode is configured lower priority than UTC mode, while force signals from the UTC instation are being received and the controller is in UTC mode, requests for the priority mode will be ignored.
ST900 Family General Handbook 16.6 Interfaces 16.6.1 Inputs An input channel may be provided such that Condition ‘0’ will cause the bus priority facilities to be isolated. Bus priority demands need not be stored. The input will take effect irrespective of the state of computer control force bits. 16.6.2 Outputs An output channel will be provided to indicate that stage confirmation signals may not be as required by the computer/linking plan.
ST900 Family General Handbook 16.7.1 Serving Priority Demands in Order of Receipt In general the controller will serve the Priority Demands cyclically. On receipt of one or more ‘Priority Demands’ the controller will move to the next stage cyclically which serves a demanded Priority Phase. If another stage further round the cycle can serve this Priority Phase and another Priority Phase, the controller will move there instead. This is the same movement strategy as used in VA.
ST900 Family General Handbook ensure that the LRV clears the junction. This is again achieved using the special conditioning facility. 16.8 Request Delays There are two delay times that can be configured to allow for the travelling time of the LRV from the request detector to the junction. These can be seen on the general timers diagram Figure 14 as well as Figure 29. The first delay covers the time that is not needed to process the priority request.
ST900 Family General Handbook 17 HURRY CALL MODE 17.1 Introduction A ‘hurry call’ demand gives precedence to a particular stage to ensure that a green signal is given to certain vehicles. Hurry calls may be used at junctions, e.g. near to fire or ambulance stations, to ensure that certain vehicles are given right of way, or in conjunction with queue detectors, to prevent blocking of a junction.
ST900 Family General Handbook expire. During the move to the called stage, any active inter-green / all-red extensions are implemented. With the hurry call stage active, the condition is held for a pre-set period, the hurry call hold period (HHC), irrespective of the condition of the minimum, extension and maximum green timers for phases in the stage. At the end of the hold period, the controller returns to a lower priority mode. Caution: Hurry call mode must be allocated a higher priority than VA.
ST900 Family General Handbook request, e.g. Fire station, or it may be used as a confirm signal for a UTC system. 17.4 Hurry Call Parallel Stage Streaming Facilities Eight Hurry Call units are available, numbered 0 to 7. Each is assigned to one stage and thus only affects the stream in which the stage resides.
ST900 Family General Handbook Note: If the Hurry Call is inserted from a momentary push-button it is advisable to use a Hurry Call Confirm output in the above instances, so that the sender knows if the Hurry Call has been accepted. 17.
ST900 Family General Handbook 18 SELECTED MANUAL CONTROL 18.1 Manual Mode For the “Manual Step-On” facility, see section 19. Manual mode selected on the Manual Panel (see section 29.8) is recognised as a mode for priority purposes. With the ‘MANUAL’ button pressed, manual mode will be selected providing there are no operating conditions for a higher priority mode (see section 12).
ST900 Family General Handbook If a stage not assigned to any button is active, none of the indicators will be illuminated. If this is the case when manual mode is first selected, the stage will continue until a new stage is selected. 18.3 Manual Control Parallel Stage Streaming Facilities For parallel Stage Streams, each stage button on the Manual Panel is configured to call a combination of stages, one from each stream.
ST900 Family General Handbook 19 MANUAL STEP-ON MODE 19.1 Introduction ‘Manual Step-on mode’ can be configured instead or in addition to the ‘Manual mode’ described in section 18. Manual step-on provides a single ‘step-on’ button rather than a number of individual ‘stage select’ buttons. When the ‘step-on’ button is pressed, the controller moves to the next stage in a pre-defined sequence.
ST900 Family General Handbook (b) Stay in one stage for a fixed period defined in the configuration and then automatically move to another pre-defined stage. The controller is then ready to respond to a further push button operation. The user may change the operation between (a) and (b) as required, by means of the handset. When the ‘all-red’ push button is operated, the controller will, subject to any safety periods, change to the All Red stage.
ST900 Family General Handbook 20 SELECTED FIXED TIME, CLF OR VA MODE Manually selected ‘FT’, ‘CLF’ and ‘VA’ are selected by mode select buttons ‘FIXED TIME’, ‘CLF’ and ‘V.A.’. The modes selected are recognised as modes for priority purposes. The respective mode will only become operative if SELECTED FIXED TIME, CLF or VA mode is a higher priority than the current mode.
ST900 Family General Handbook 21 CABLELESS LINKING FACILITY (CLF) MODE 21.1 CLF Introduction The ‘Cableless Linking Facility’ (CLF) allows a method of linking traffic intersections along routes within an area using timing information derived from the ‘Master Time Clock System’ (see section 25) in their controllers. Different Plans are used during the day to cater for varying traffic patterns. Each CLF Plan has its own configurable ‘cycle time’.
ST900 Family General Handbook The timetable settings that are programmed may be changed via the handset using the TSW or TTB command. If the group timings, group influences and/or timetable settings are not known at the time that the controller is configured, they may be added at a later date using the handset. 21.3 Group Influences Each group influence consists of a function (listed below) and an associated stage (or any stage within the stream).
ST900 Family General Handbook Functions 8 and 9 only apply to stand-alone pedestrian streams: 8. INHIBIT PEDESTRIAN - prevent the appearance of the pedestrian phase and hold the vehicle phase at right of way. Specify any stage in the stream. 9. ALLOW PEDESTRIAN - allow the pedestrian phase to appear at right of way if demanded. Specify any stage in the stream.
ST900 Family General Handbook Because every controller is introducing plans as though they have all been running since the same base time, the actual time that a plan is requested to start is not critical. 21.4.2 Base Time CLF Example Consider a controller configured with a base time of 2am, a cycle time for the plan of 70 seconds, and a request to start at 7:30am.
ST900 Family General Handbook If the current plan does not have an exit time configured, but the new plan has an entry time configured, the current plan continues until the new plan reaches its entry time and takes control. The range for the (PLE) entry time and the (PLX) exit time is 0 to ‘the cycle time minus 1’, in 1-second steps. A value of 255 indicates that no entry/exit time is required. 21.
ST900 Family General Handbook During morning peaks, traffic flowing into the city centre (C-B-A) is required to meet a succession of signals at green (a ‘green wave’). Typically, free flowing morning peak traffic takes 20 seconds to travel from ‘C’ to ‘B’ and 15 seconds to travel from ‘B’ to ‘A’. The main road lights at ‘B’ should therefore change to green 20 seconds after those at ‘C’, and those at ‘A’ a further 15 seconds later.
ST900 Family General Handbook 21.6.2 Using Plan Offset Times (Base Time CLF Only) The offset between the controllers is achieved by specifying ‘offset’ times at each controller. Note that ‘offset’ times are only available with the Base Time CLF system. If this system is used, all the plans at each controller can request the main road to appear at green at time ‘0’ within the cycle time for example.
ST900 Family General Handbook the offset time internally; in this case calculating that an offset of just ‘1’ second is actually needed (the difference between the offset and cycle times). 21.6.3 Using Different Start Times (Non Base Time CLF Only) This system defines the offset between the controllers by altering the time at which the plan starts. If this system is used, all the plans at each controller can request the main road to appear at green at time 0 within the cycle time for example.
ST900 Family General Handbook Plan 0 (Required Offset) Group 0 (Main Road) Group 1 (Side Road) Cycle Time A (35) B (20) C (0) 35 20 0 75 15 60 65 5 60 35 60 Plan 1 (Required Offset) Group 0 (Main Road) Group 1 (Side Road) Cycle Time A (0) B (19) 0 19 30 44 45 45 C (46) 46 1 71 26 45 Note that where the original group time plus the required offset exceeds the cycle time (see those entries that have a strikethrough), the group time has to be manually adjusted so that it always specifies a
ST900 Family General Handbook 2. The use of the ‘Hold’ and ‘Prevent’ group influences should be avoided if possible, but if not their use, i.e. the group time and Group position within the plan, must be considered carefully. The “GO VA” influence should not be used at all, as this will nearly always cause disruption to the Synchronisation of Controller and Plan, even when used in CLF in general. 3.
ST900 Family General Handbook 22 VEHICLE ACTUATED (VA) MODE In VA mode the controller monitors all demands, extensions and maximum green timers every 200 ms to select a suggested stage in order to satisfy as many demands as possible without missing any stage containing a phase with a demand. Section 7 describes the sources of demands, sections 6.5.2 and 6.5.3 describe green extensions and maximum times and section 5.5 describes the controller’s stage change algorithm.
ST900 Family General Handbook When in Stage 1 Consider Stage 2… a) If there are no demands for phases C and E, ignore stage 2 and check stage 3. Note that there can be no demands for phase B since it is already at right of way. Also note that the demand for phase C would usually come from a call/cancel detector (see section 8). b) If phase A is to keep right of way (due to extensions for example), ignore stage 2 (but remember if there are demands for phases C and E) and check stage 3.
ST900 Family General Handbook b) If phases C or E need to keep right of way, ignore stage 1. Since phase B also resides in stage 1, it does not matter if that phase has to keep right of way. c) Stage 3 would service demands for phase D whereas stage 1 would not, so if phase D is demanded, ignore stage 1. d) If stage 2 has been suggested, it must have been due to a demand for phase D which would force stage 1 to be ignored (see previous statement). Thus to reach this statement, no stage has been suggested.
ST900 Family General Handbook 22.2 Green-Arrow Restrictions on Vehicle Actuated Mode UK requirements dictate that green-arrows do not lose right of way without their associated 3-aspect traffic phase showing the amber leaving period. This places restrictions on the way the controller is allowed to operate. 22.2.
ST900 Family General Handbook Due to this restriction, it is commonly required that stage 2 is prevented unless there is a demand on phase C from the right-turning traffic (and possibly only if there is a demand for the side road as well – see section 22.2.1 above).
ST900 Family General Handbook the same dummy phase in each stage, this phase would be specified for reversion allowing the next all-red stage in cyclic order to become active. 22.4 Vehicle Actuated Parallel Stage Streaming Facilities Each stream will move around its own stages according to its own on street demands and extensions independently of any other stream. There is an Arterial Reversion facility for each stream.
ST900 Family General Handbook 23 FIXED TIME WORKING MODE There are three methods of fixed time working: Fixed Time mode (FT) Fixed Time to Current Maximums (FTCM) Fixed Vehicle Period (FVP) mode on a stand-alone pedestrian stream. 23.
ST900 Family General Handbook With Selected Fixed Time to current maximums, when NORMAL mode is restored there will still be demands present for all non-running phases, so no vehicles will be trapped against a red signal. 23.3 Fixed Vehicle Period (FVP) Mode The vehicle phase of a stand-alone pedestrian stream appears at green for at least a fixed period. No vehicle detection equipment is required. If the pedestrian phase is demanded while this period is still running, the vehicle phase remains at green.
ST900 Family General Handbook stage combination is reached, after which stage combination 0 will commence again. During Linked Fixed time mode the controller will display fixed time mode on the handset (Mode 1). Fixed time mode need not be active on all streams. Only the streams that have fixed time active will be demanded through the specified stage combination.
ST900 Family General Handbook 24 STAGE MOVEMENT RESTRICTIONS When a specific stage change is required not to occur for safety or traffic control reasons, it is possible to restrict the move. The types of restrictions available are: (a) PROHIBITED MOVE: This is the most restrictive and the effect is for the controller to stay on the same stage and not look for other moves until the stage change conditions are altered.
ST900 Family General Handbook 24.1 Prohibited Moves When a move to a stage is prohibited and there is a demand for the prohibited stage, the controller will not move to that stage and the current stage will remain active until either of the following happens: (i) The stage change conditions alter and a move can be made to a stage before the prohibited stage. (ii) The stage change condition is removed and replaced by another stage change condition.
ST900 Family General Handbook The ignore move facility is normally only required during modes where it is possible to have stage change conditions present for more than one stage, i.e. VA, Priority, Emergency Vehicle and UTC mode. 24.4 Permitted Moves Permitted moves are not programmed they are achieved by the lack of any stage movement restrictions. Although a stage may be prevented from appearing in one mode, there will be occasions when the stage is active and the mode changes.
ST900 Family General Handbook By preventing one pedestrian stream from appearing at right of way while the other is at right of way, it allows the pedestrians time to cross one carriageway before the other crossing is allowed to appear at right of way. The firmware provides the facility for a dual stand-alone pedestrian stream controller, which can be enabled using the handset command CIL. Special conditioning must be used if other combinations are required, e.g.
ST900 Family General Handbook 25 MASTER TIME CLOCK SYSTEM 25.1 Introduction The master time clock system (MTCS) provides the following facilities: - A software clock. - A crystal oscillator and standby RTC circuit which is battery supported. - A software timetable (see section 26). - Plan timings for Cableless linking in software (see section 21). - Plan influence definitions in software (see section 21).
ST900 Family General Handbook 25.3 Timetable Resolution CLF plans and timetable events are introduced by timetable settings to a resolution of 1 second. 25.4 Daylight Saving The RTC will advance or retard one hour at 02.00 hours on the date (usually a Sunday) specified by the handset commands CKA and CKR. Once actioned the date is updated by the controller to identify the same day in the following year.
ST900 Family General Handbook The Controller only synchronises its minutes and seconds from the GPS Clock. The date and hour are not ‘adjusted’ because the GPS Clock returns ‘UTC’ time (Coordinated Universal Time), which does not take time zones or daylight saving in to account. The user is responsible for setting the clock to approximately local time, which the controller will then adjust using the minutes and seconds from the GPS Clock.
ST900 Family General Handbook 26 THE EVENT TIMETABLE 26.1 Plan Change/Event Timetable There are 64 entries in the Event Timetable. Within each entry the following is specified: The ‘Day Code’, which is a configurable number that indicates the day or days on which this Event occurs. The default settings for the day code are as follows and match those used by the T400, although these can be changed at configuration time. The Holiday Clock, see section 26.5, can further enhance these day codes.
ST900 Family General Handbook 26.3 Switch Function Setting The event timetable is introduced by a master time clock timetable setting with a function number of ‘2’. Following the function number 2 in the MTCS timetable will be a ‘Parameter’ number. This parameter number refers to a combination of event switches that are required to be inoperative ‘0’ or operative ‘1’. Thus, when the MTCS invokes a time switch parameter, a combination of events may be set operative or inoperative.
ST900 Family General Handbook times that do not required to be changed in an alternative plan should be set to the same value as in the previous plan. Any timer that is already active at the time of switching will remain effective until the next start of that timing period. For example, if a maximum green of 50 seconds has already started and the maximum is switched in the middle of that 50 seconds to a new value of 30 seconds, the 50 seconds will still be timed.
ST900 Family General Handbook When a stage is deleted, any demands for that stage or for phases within the stage must also be deleted by the same timetable setting, unless the phases appear in other stages. In order to delete current demands and prevent further demands, it is recommended that such demands be deleted by using special conditioning to write a “FALSE” state to the entry in the latched or unlatched demand arrays for the appropriate phase/stage.
ST900 Family General Handbook Time switch Event Default State (i.e. when no time switch events are active) 26.3.1 Input active Input normal operation (following external influence) 26.3.1 Input inactive Input normal operation (following external influence) 26.3.1 Output active Output normal operation (following controller influence) 26.3.1 Output inactive Output normal operation (following controller influence) 26.3.2 Maximum Green Maximum green timeset A and Priority Set 0 selected. 26.3.
ST900 Family General Handbook 26.5.2 Special Holiday Periods The Holiday Clock facility allows the period between two dates to be considered as a Special Holiday period. Currently, up to 32 special holiday periods can be configured in advance. Example: The controller can be configured with a special holiday period that starts on 29-MAR-99 and finishes after 09-APR-99 in order to define the Easter school holiday period as March 29th to April 9th 1999.
ST900 Family General Handbook 26.5.3 Special Days The Holiday Clock facility allows specific individual dates to be defined when the normal timetable events should not run, e.g. Bank Holidays. Currently, up to 64 special days can be configured in advance. For each Special Day, a date and a day code is defined... Day Codes 15 to 99 If the specified day code is not one of the normal timetable day codes (see section 26.1), only timetable events that use that exact day code number run on that specific date.
ST900 Family General Handbook 27 LINKING 27.1 Repeat Pulses The Siemens Type 900 Controller may be linked to other traffic controllers so that a pulse which occurs, or a pulse which is created by a condition occurring, in one controller may be repeated to the other. The function of the pulse when received will depend on the method of control of the intersection. One function of the facility is to maintain traffic flow through closely associated intersections.
ST900 Family General Handbook Output Bit LO Local Link Bit Description ‘Link out’ signal to an adjacent pedestrian crossing, driven by vehicle green (‘1’ = green on) Power/Lamps Off State ‘0’ Configuration Special conditioning Local link dimming can be configured using the UTC dim override input SO (see Section 15.3.9) and setting DIT=1 which allows the input to force the controller to dim if active.
ST900 Family General Handbook 28 ALTERNATIVE SIGNAL SEQUENCES AND FLASHING SIGNALS 28.1 Alternative Signal Sequences (Non UK Only) For the UK, the signal sequences are fixed and cannot be changed. For non UK use, there are 8 easily definable lamp sequences, with each phase assigned one of these lamp sequences. Each lamp sequence set defines the signal states (i.e. colours) for at right of way, at no right of way and the Part-time (standby) state.
ST900 Family General Handbook changing to no ROW: BLACKOUT or FLASHING GREEN MAN If an amber is required, the amber can be configured in the signal sequence, and if a wait indicator is also required, this has to be programmed as a switched sign phase (see section 6.2.6(b)). 28.2 Alternative Start-Up Sequences As an alternative to the standard start-up sequence and blackout during Part-time mode, modifying the lamp sequences may easily provide the following.
ST900 Family General Handbook Traffic phases: Phases A,B & C at no ROW: RED changing to ROW: RED/AMBER GREEN at ROW: changing to no ROW: AMBER Phase D RED RED/AMBER FLASHING GREEN AMBER The displays that are programmed to flash will do so every time they appear. They cannot be programmed to be solid and flashing.
ST900 Family General Handbook CHINA: Beijing: Normal start-up sequence and blackout part-time mode. Traffic: red - green - amber - red. Supply: 220V 50Hz. Shekou: Normal start-up sequence and blackout part-time mode. Traffic: as Beijing. Ped: red - green - flashing green - red. Supply: 220V 50Hz. Shen Zhen Province: As Columbia, but 220V 50Hz. COLUMBIA: Flashing amber start-up and part-time. Traffic: red - green - amber - red. Ped: red - green - flashing green - red. Supply: 110V 60Hz.
ST900 Family General Handbook SYRIA: Flashing amber start-up and part-time. Traffic: red - green - amber - red. Ped: standard (with three-second blackout). Supply: 240V 50Hz (Damascus). SRI LANKA: As Bahrain, but with flashing amber start-up. 240V 50Hz. TRINIDAD: Flashing amber start-up with flashing amber (main road) and flashing red (side road) part-time. Traffic: red - green - amber - red. Ped: standard sequence.
ST900 Family General Handbook IMPORTANT: As Wig-Wag configurations are more complex to create than intersection configurations it is strongly recommended that they should only be created by Intersection Engineering at Siemens, Poole. 28.5.2 Flexible activation Typically Wig-Wags are activated by a button within the fire or ambulance station.
ST900 Family General Handbook Wag signals, Wig-Wag Signals are also available with flashing blue aspects (replacing the usual flashing red aspects) for use in these positions. In countries where the UK specification TR2513 does not apply, the amber period can be altered or removed, in similar ways to a traffic amber-leaving period. The default flash period for the reds is 400mS (left) and 400mS (right). Longer flash periods are available if required.
ST900 Family General Handbook 28.5.5 Red Lamp Monitoring Wig-Wag signals are typically arranged in pairs, one pair of signals for each approach; see Figure 36 on page 209. It is required by TR2513A that red lamp failures are counted independently on each Wig-Wag approach, and all the Wig-Wag signals are extinguished when any two red lamps fail on an approach.
ST900 Family General Handbook 28.5.6 Flashing Amber Wig-Wags Figure 38 – Flashing Amber Wig-Wag Signal In addition to the flashing red Wig-Wag Signals shown previously, the controller is capable of driving and monitoring flashing amber Wig-Wag Signals, e.g. at cattle crossings. If lamp monitoring is required, with or without ‘red’ lamp monitoring options, then it is recommended that the sequence used for the flashing red Wig-Wag on two phases is used, but amber coloured aspects are fitted instead of red.
ST900 Family General Handbook 29 INPUTS AND OUTPUTS 29.
ST900 Family General Handbook 29.4 Ports The ports of the controller provide a means of connecting the hardware of the input and output signals to the controller software. Each port normally consists of 8 bits (0 to 7) which must be either all inputs or all outputs. In order to calculate the number of ports that are required, the inputs and outputs are allocated, where practical, into groups of 8. It is better for configuring if all the detectors for one phase are on the same port.
ST900 Family General Handbook Clearing DFM Faults: If the RFL=1 or the RDF=1 handset command is entered, or the DFM Reset push-button on the Manual panel (if configured) is operated, the DFM fault will be cleared assuming the controller has seen the input change state. The cabinet alarm lamp will be extinguished, the input will no longer be forced active or inactive, and the fault log entries will be cleared from the controller’s fault log. Each controller input can be assigned to one of eight DFM groups.
ST900 Family General Handbook 29.7 Uni-Directional (U/D) Facility If only vehicles travelling in one direction over a detector are required to activate it, whereas vehicles travelling in the opposite direction are not, the controller includes the Uni-Directional (U/D) facility. The facility uses two inputs that are connected to two inductive loops that partially overlap on the carriageway, such that vehicles travelling in the required direction activate the ‘A’ loop first, then the ‘U’ loop.
ST900 Family General Handbook 29.8 Signal Dimming 29.8.1 Solar Cell Signal dimming is provided to dim the signals during darkness hours under control of a photoelectric solar cell mounted on a signal head. 29.8.2 Solar Cell – ST900 and ST900LED (230V Operation) Section 2.5 details the specification of the solar cell input of the controller.
ST900 Family General Handbook 30 MANUAL PANEL 30.1 Standard Facilities (Intersection Controller) SIGNALS CABINET ALARM OFF SIEMENS ON MANUAL CONTROLS MODE SELECT ALL RED 1 2 NORMAL 3 4 5 MANUAL 6 7 COMMAND HURRY CALL (AUX4) HIGHER PRIORITY (AUX5) AUX 1 AUX 2 AWAITING PROHIBITED FIXED TIME VA MOVE AUX 3 CABLE LESS LINK LAMP SW 1 SW 2 SW 3 TEST Figure 39 – Intersection Manual Panel 30.1.
ST900 Family General Handbook 30.1.2 Mode Select Push-Buttons When the NORMAL mode select push-button is pressed, the highest priority mode with operating conditions active will be the current mode and the NORMAL indicator will be illuminated. If the mode running on all of the streams is VA, CLF or FIXED TIME, that indicator on the manual will also be illuminated indicating that the controller is running ‘normal VA’ for example.
ST900 Family General Handbook 30.1.7 Manual Button Indicators The Manual Button Indicators are for use during Manual mode. They generally indicate the number of the current stage selected, but see section 18.2. These indicators are only illuminated when manual mode is in operation or when the handset is plugged in. While the controller is moving to the stage, the indicator will flash once a second, and when the stage is reached, the indicator will stop flashing and remain on. 30.1.
ST900 Family General Handbook 30.2 Stand-alone Pedestrian Controller Manual Panel SIGNALS CABINET ALARM OFF SIEMENS ON AUX 1 PED 2 PED 1 CONT PED DEMAND CONT PED DEMAND CONT VEHICLE EXTEND CONT VEHICLE EXTEND VA VA SELECT SELECT FVP FVP AUX 2 AUX 3 DFM RESET LAMP SW 1 SW 2 SW 3 TEST Figure 40 – Stand-alone Pedestrian Controller Manual Panel 30.2.
ST900 Family General Handbook 30.2.2 Continuous Vehicle Extend These buttons can be used to insert continues vehicle extensions on the first (PED1) or the second (PED2) stand-alone pedestrian stream. Pressing the button toggles the state of the associated indicator. While the indicator is illuminated, the vehicle phase is artificially extended up to its maximum green period. 30.2.
ST900 Family General Handbook 30.3 Hong Kong Internal Manual Panel The internal Manual Panel used on ST900s supplied to Hong Kong is similar to the standard item although they are housed internally and mounted horizontally. The following sections describe the differences. 30.3.1 Signals OFF/ON Switch This is not mounted on the Internal Manual Panel - it is mounted on the Police Manual Panel behind the Manual Access Door. Its function is unchanged from the standard item. 30.3.
ST900 Family General Handbook 31 SPECIAL CONDITIONING 31.1 Introduction There are often special requirements for the operation of a controller, which are not covered by its normal methods of working. This is normally due to the peculiarities of a particular intersection.
ST900 Family General Handbook Instigation of Flash Amber Mode due to Fault Holding a stage with a Special Conditioning timer 31.4 Reading Controller Timers It is possible to read whether certain controller timers are active, held or expired, and also what the count value is.
ST900 Family General Handbook 32 ON STREET CONFIGURATION 32.1 Introduction A facility to enable On Street Programming exists for non UK controllers. A configuration option enables this facility, and data entry for the configuration is entered via the handset. Prior to any data being changed the signals must be switched off and a second security access code has to be entered.
ST900 Family General Handbook 32.3 Fixed Items and Notes The following data items will be set in the configuration and currently remain fixed: Only one intersection stream is configured, i.e. not parallel stage streaming Intersection control only, i.e.
ST900 Family General Handbook 33 HARDWARE CHECKS 33.1 Monitoring the Signals The correspondence check (also known as an equivalence check) is available on all three colours, not just greens. A correspondence error on a monitored green will always cause the controller to shut down. For Non-UK Controllers, correspondence errors on reds and ambers can be configured to report the failure but allow the controller to continue normally, shown by the options (a) to (d) in the table.
ST900 Family General Handbook Condition CPU Fault Action Green Correspondence Failure a) Controller Shutdown Main Compares “required” states against actual states or the dual voltage monitors disagree. CPU b) Stream direct to part-time state Measured by voltage on drive. Functions with no external load. Monitoring cannot be disabled. a) Controller Shutdown Sig See section 33.3 for details of the options a) Mon b) Controller Shutdown to d) available for Fault Actions.
ST900 Family General Handbook Condition CPU Fault Action Normal Lamp Failure Duration is configurable by 8DF file or handset command. Main Fault Report only Only Diagnostic Checks: Monitor Validation (see section 33.4) Monitoring cannot be disabled. Diagnostic Checks: Aspect Monitoring Miscellaneous internal checks of the controller logic, includes bus tests etc. Monitoring cannot be disabled.
ST900 Family General Handbook Condition CPU Fault Action Lamp Supply Relay Failure Stuck closed check. Stuck open will be detected by the ‘low lamp supply test’ above. Main Check cannot be disabled and failure always Only Controller Shutdown results in controller shutdown. Note: Test to be done at start-up and at a configurable time each day. Firmware Checksum Fail Check on power-up. Monitoring cannot be disabled. Check performed by the all processors in the system on their own firmware.
ST900 Family General Handbook 33.2 Correspondence Monitoring – Greens Option a) Fail to Part-Time State is not selected. Both processors will independently detect a green correspondence failure. If the actual states of the greens do not match the requested states and the fault will be confirmed if the situation persists. When the fault is confirmed, the processor will shut down the whole controller. Option b) Fail to Part-Time State is selected (Non-UK Only).
ST900 Family General Handbook This test is undertaken without the knowledge of the Signal Monitor so if the signal remains active (say due to a fault) the Signal Monitor will detect correspondence (and possibly conflict faults) and shut down the controller. For the ST900 Controller, when the Monitor Validation signal is active, the hardware on each Lamp Switch card inverts a number of the actual lamp states.
ST900 Family General Handbook In addition, there is a hardware watchdog that monitors the state of the Main Processor and will also shutdown the controller if a problem is detected. The requested red, amber and green states for all 32 phases are sent by the Main Processor every mains cycle to the Phase Bus Processor and written out to the Lamp Switch cards. The writing of data to the Lamp Switch cards is synchronised to the mains cycle.
ST900 Family General Handbook 34 HARDWARE FAIL FLASHING FACILITY (NON UK ONLY) Hardware Fail Flashing is an integral part of the controller configured using various hardware switches and/or links. The IC4 Configuration needs to be made aware of whether Hardware Fail Flashing is required, although configuration data does not enable or disable the facility.
ST900 Family General Handbook If either processor or the hardware watchdog shuts down the controller, with the ‘Non UK Links’ fitted, the following sequence occurs: 1. One Lamp Supply relay is released, switching off the lamp supply to all but the first LSLS Card. 2. The other Lamp Supply relay is forced on; 3. The Dim/Bright Relay released to force signals to their ‘Bright’ state; 4. All the Red, Amber and Green phase output latches on the LSLS cards are ‘Reset’; 5.
ST900 Family General Handbook 35 SELF-TEST FACILITY Self-Test checks as much of the hardware as possible without the controller requiring a configuration. It is a completely separate function provided by the firmware with faults displayed on the handset directly. When the power is switched off and back on again after the Self-Test, the normal operation of the traffic controller is not affected in any way and continues as though nothing has happened.
ST900 Family General Handbook 36 MOVA (MICROPROCESSOR OPTIMISED VEHICLE ACTUATION) 36.1 Introduction MOVA is implemented by a separate unit, which monitors the movement of vehicles through an intersection and then adjusts the operation of the controller to optimise its flow. If using a Siemens Gemini2 MOVA unit, also see the Gemini2 Handbook, part number 667/HB/38001/000. A MOVA unit uses the controller’s UTC interface, which allows it to influence the operation of the controller.
ST900 Family General Handbook the OMU to monitor the controller’s inputs and lamps without the need for any other cables. See the description of the enhanced serial link in the Gemini2 handbook, With a combined Siemens Gemini2 and MOVA unit, the control and reply bits between the ST900 and MOVA are also passed through this link so no digital I/O cables are required. Also, all the MOVA detectors are only connected to the controller and passed to MOVA through this serial link.
ST900 Family General Handbook 37 INTEGRAL TC12 OTU 37.1 General Description The Integral TC12 OTU is a double extended Euro sized card which connects to the ST900 Main Processor via the Extended System Bus. For more information on the Integral TC12 OTU, refer to the TC12 General Handbook 666/HB/43100/000.
ST900 Family General Handbook or maximum green timings, can be uploaded to the Instation, modified there and then downloaded back to the controller. The integral OTU also provides the Instation with a remote handset link to the controller, allowing any handset commands to be entered remotely to view data and, assuming that the correct access has been obtained, allow values to be changed. 37.
ST900 Family General Handbook 38 LAMP MONITORING 38.1 Lamp Monitoring Facility The Lamp Monitor provides a means to check that the signals (the lamps) are all working and no failures have occurred. The ST900 Family controller firmware includes the lamp monitoring facility, which can be enabled by the configuration, and the standard ST900 controller hardware includes all the sensors necessary to monitor all the lamps driven by the controller as standard. 38.1.1 Lamp Monitor Fault Reports 38.1.1.
ST900 Family General Handbook 38.1.2 Lamp Monitor Operation For each sensor, a configurable threshold (in watts at the nominal lamp supply) can be defined, or is implied by the selection of the Load Type (detailed in section 38.1.4). When a change in the current is detected, if the size of the change is larger than this threshold, the lamp monitor will start to confirm the lamp fault or replacement.
ST900 Family General Handbook 38.1.3 Lamp Monitor Phase Types Each controller phase is usually monitored by one lamp monitor sensor. Each sensor must be assigned a lamp monitor ‘phase type’, although these do not need to be changed from their default settings unless the lamp sequences for the phases are altered (see section 28). The phase types currently available on the ST900 Family of controllers are shown below.
ST900 Family General Handbook 38.1.4 Lamp Monitor Load Types Where LED Signals* are used, the controller must also be configured with the correct load type for each lamp monitor sensor. This is configured using the IC4 Configurator and/or the KLT handset command. The load type informs the controller as to the type of signal connected; all signals monitored by the sensor must be of this type. Specifying the load type configures various parameters within the lamp monitor.
ST900 Family General Handbook 38.2 Red Lamp Monitor 38.2.1 Introduction To meet UK requirements, the Red Lamp Monitor function is required at part-time signals (see section 14), at junctions that are fitted with pedestrian audible or tactile devices (see section 6.2.2) and stand-alone pedestrian signals (see section 6.11). The vehicle red lamps are monitored and when lamp failures are detected, the operation of the controller is modified to ensure that unsafe signal conditions do not occur.
ST900 Family General Handbook 3-second delay is required. Even if phases B and C also had missing red lamps, the calculation would still result in a 3-second delay. Example 3 shows what happens if phase A has no missing red lamps, but phase C has one or more missing. At the point at which phase D would normally appear, the RLM facility calculates that of the 5 second delay required by phase C, only 2 seconds is left to run. Therefore, phase D is delayed by 2 seconds.
ST900 Family General Handbook In the following diagram, phases A and B are losing right of way and conflict with phase D that is gaining right of way. Phase C is also losing right of way and conflicts with phase E. The requirement is that phases D and E appear at green at the same time on this stage to stage movement. Example 1 shows the normal operation where a 10-second phase delay delays the appearance of phase E. Example 2 shows what happens when phase A has one missing red lamp.
ST900 Family General Handbook 38.2.2.3 RLM Delays and Intermediate Stages When a stage to stage move is made via an intermediate stage, the RLM delays are applied on the two stage moves independently. However, this can mean that the terminating vehicle phases do not terminate on the same stage move in which the conflicting pedestrian phases appear.
Phases With a 2nd Red Lamp Fault Confirmed ST900 Family General Handbook A B C X Y Z A2 B2 A 1 1 1 Phases Inhibited or Blacked-Out B C X Y Z A2 B2 F2 1 1 1 1 1 1 1 1 1 1 F2 Figure 43 – Second Red Lamp Failure (Example 1) Phases A, B and C belong to a part-time stream and therefore any failures on these phases cause all three phases to be blacked-out so that the whole stream is extinguished. Phases X to B2 belong to a stream where pedestrian RLM is required.
ST900 Family General Handbook Phases With a 2nd Red Lamp Fault Confirmed stream, failures on any vehicle phases can easily be configured to blackout all the phases of both streams, i.e.
ST900 Family General Handbook Note: If it is required that red lamp faults on the stand-alone pedestrian stream extinguish all the signals of the controller, but some streams normally only inhibit their pedestrian phases, then special conditioning can be used to switch off the signals when the fault is confirmed. Do not select all the phases in the intersection stream (as shown above in orange). 38.2.3.
ST900 Family General Handbook RLM E 5 G 6 Disabled F Monitoring LMU 7 LMU H Last Phase of the Intersection 8 External Sensors RLM RLM Approach 1 35 LMU Stand-Alone Pedestrian Phase RLM RLM Approach 2 36 LMU Spare Phase LMU Figure 46 – RLM Approaches (External Sensors) 38.3.2 Using Additional Phases (ST900 or ST900 ELV) An alternative is to configure phases F and G as the two vehicle approaches and phase H as the pedestrian.
ST900 Family General Handbook green commands PAR and PIT are stream-based so the same timings would be applied to both vehicle phases. The puffin and toucan pedestrian to vehicle intergreen is controlled by the pedestrian phase’s clearance period which would automatically delay the appearance of all conflicting vehicle phases (as it does on an intersection). The IGN inter-green times for the phases on the stand-alone pedestrian stream are not used. 38.3.
ST900 Family General Handbook 2) All the timings associated with the two vehicle approaches will always be the same since they are being controlled by the same phase. Note that the example above also shows that a second LSLS Output has been configured for Phase G Green for Audible or Tactile Units. On the IC4 Lamp Monitor Screen the Sensor for this second LSLS Output has been set to “N/A” to disable Lamp Monitoring on that Output.
ST900 Family General Handbook 39 RIPPLE CHANGE FACILITY The ‘ripple change’ facility optimises stage changes at large busy intersections that have phases that overlap into two or more stages. 39.1 What is a Ripple Change? The ripple change facility is best explained by an example.
ST900 Family General Handbook 39.2 Normal Controller Operation Normally the firmware can only decide to make a stage change while the controller is steady in a stage and cannot make another stage change while one is already in progress on the same stream. This restricts the operation of the junction as follows: When a gap appears on phase B while phase A is still busy the controller remains in stage 1. When a gap then appears on phase A, the controller will make the move from stage 1 to stage 3.
ST900 Family General Handbook controller can decide to move to stage 3 instead. At this point, it terminates phase B, which allows it to bring on phase D seven seconds later. Compare this with diagram above and it shows that phase D and stage 3 have been given right of way much earlier. In effect, when a gap appears on phase A the controller will terminate phase A and begin the process of bringing on phase C.
ST900 Family General Handbook 39.5.2 Demand Dependant Phases All phases which are gaining right of way by the move from stage 1 to stage 2 which are fixed in stage 2 or are demand dependant and demanded, including those running gaining phase delays, will also have to appear in stage 3 for the ripple change to be considered. Normally a ripple change from “1 to 2” to “2 to 3” will not be allowed if a phase appears in stage 2 but not in stages 1 and 3.
ST900 Family General Handbook At the start of the first stage change in which a phase can gain right of way in a series of ripple changes, the phase delay is started on that phase if one has been configured on that stage movement. After the delay and any inter-greens have expired, the phase is ready to appear. If the phase is demand-dependant, the appearance will be delayed until a demand is actually registered.
ST900 Family General Handbook phase delays affected’ is configured as required, rather than being left as the default of ‘all ones’. 39.5.6 RLM Delays The RLM facility will continue to function correctly along side ripple change, as long as RLM delays are only configured between conflicting phases. The appearance of phases will be delayed even if the vehicle phase actually terminated on a previous stage change (unless the inter-green and RLM delay time has already expired).
ST900 Family General Handbook STAGE 1 STAGE 2 G STAGE 3 F STAGE 4 H D E B A B A B C Stage 1 allows the traffic from the north and south to flow while stage 2 allows the heavier traffic from the north to also turn right unopposed by the other traffic. When the pedestrian phase G has finished its minimum green period in stage 2, it can be terminated and the left-turn green filter arrow F can be given right of way.
ST900 Family General Handbook The alternative is to add an intermediate stage to which the controller can ripple change during the move from stage 2 to stage 3, so allowing it to terminate phases A and B before phase F has actually appeared. Once phase F has appeared, the controller can move to stage 5, bringing on phases C and E when any inter-green times from A and B have expired.
ST900 Family General Handbook Since phase F is configured as a left-turn green filter arrow, it remains at green until its associated phase, i.e. phase E, appears at green even though its minimum green time is set to zero and stage 4 finished several seconds earlier. This move has allowed the controller to: Terminate the pedestrian phase G when its minimum green time expires, allowing the left-turn green filter arrow on as soon as possible.
ST900 Family General Handbook 40 INDEX 11” rack ............................................22 All-Red Stage .................................116 Alternative Cabinets ...................22, 44 Alternative Moves...........................183 Appearance Types ...........................90 Arterial Reversion ..........................177 Atmospheric Conditions .............38, 69 Audible Supplies ..............................37 ELV .............................................61 Battery safety ............
ST900 Family General Handbook Minimum Green ................................85 Modes ......................................73, 124 Monitor Time ..........................146, 147 Monitor Validation ..........................226 MOVA.............................................232 Near Side Pedestrian Crossing ........98 Non UK Controller ............................22 Non UK Fail Flashing .......47, 130, 229 Non UK On-Street Configuration....220 Non UK Signals ..........