Specifications
ST900 Family General Handbook
667/HB/32900/000 Issue 11 Page 127 of 265
1
1
2
2
M
M
O
O
D
D
E
E
S
S
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 .................................................................................. see Section 17
Manual Operation ...................................................................... see Section 18
Manual Step-On, if fitted. .......................................................... see Section 19
VA, CLF or FT Operation (selected via mode switch) ............... see Section 20
Cableless Linking (CLF) ............................................................ see Section 21
Vehicle Actuated (VA) ............................................................... see Section 22
Fixed Time (FT) / Fixed Vehicle Period (FVP) .......................... see Section 23
The following factors influence the selection of the modes:
The status of the incoming ‘hurry call’ signals
The status of the UTC force signals
The status of the Priority Inputs
The status of the manual select buttons
Part-time requests
Time switch/CLF signals
Conditioning signals
Integrity of the hardware/software
The mode priorities are defined during controller configuration with the following
restrictions, assuming all stipulated modes are utilised:
Signals off / flashing periods during the Part-time cycle have highest priority
after start-up mode.
Cableless linking mode must be higher priority than VA mode.
Either VA or fixed time mode is always the lowest priority.
With the mode priorities defined, the controller adopts the highest priority mode for
which the following conditions of entry apply:
Part-time off (or flashing) period: Part-time off selected by master time clock
or special conditions such as queue detectors.
Hurry call mode: Hurry call applied and any call delay expired.
UTC mode: When the controller has received force bits.
Manual Control selection: MANUAL selected on the Manual Panel.
Cableless linking mode: A valid CLF plan is selected by the master time
clock.