Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 10 Page 81 of 265
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.
5.6.4 Mode Operation
VA, Fixed Time, UTC, Hurry Call and Priority modes will normally operate
independently on each stream.
Linked Fixed Time, CLF, Manual and Part-Time modes will normally affect all
streams of the controller, unless individual streams have the mode disabled or are
running a higher priority mode, although CLF will only run on the streams that the
group influences affect.
Within the sections that describe each mode is a sub-section detailing the operation
of the mode when more than one stream is configured, see below:
13.2 – Start-up mode 18.3 – Manual mode
14.3 – Part-time mode 19.3 – Manual Step-On mode
15.10 – UTC mode 21.7 – Cableless Link Facility
16.4 – Priority mode 22.4 – Vehicle Actuated mode
17.4 – Hurry Call mode 23.4 – Fixed Time mode
5.6.5 Other Facilities
Parallel stage streams may also affect other facilities available in the traffic
controller.
Most facilities such as Call/Cancel units, Window Times and the Ripple Change
facility automatically run independently on each stream.
Others, such as SDE/SA, the Extend All-Red facility and the Red Lamp Monitor may
need to be configured carefully when more than one stream is configured.
See the following sections:
6.6.4 – Window Timers 10.2.3 – Extend All Red
8 – Call/Cancel Units 38.2 – Red Lamp Monitoring
9.5 – SDE/SA 39.4 – Ripple Change Facility