Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 11 Page 226 of 265
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. not Pelican
 No SDE
 No alteration of configured identity code
 No dummy phases*
 Lamp sequences are fixed
 Mapping of phases to LSLS Outputs is fixed
 No alteration of opposing phases - all phases oppose each other
 Revertive termination always reverts to the same phase
 No unlatched demands and no call/cancel facilities
 Start up demands fixed for all phases (also for leaving manual and FT modes)*
 Allocation of prohibited move tables to modes is fixed (and only two tables
available)
 No hold inter-green or extend all reds
 Start up and part-time stage is fixed
 Demand and extension inputs are fixed
 All 8 manual stage select buttons always available for stages 0 to 7 - selecting a
stage not configured will light the prohibited move LED
 Three auxiliary switches fixed function selected by the Configurator
 Fixed mode priority
 No switched signs available
 Timing limit values set to their widest range
 CLF base time fixed
 UTC available but fixed control and reply layout
 No hurry call facilities
 Fixed event switch definitions (e.g. alt max, part-time operation, etc.)
 No Red Lamp Monitoring (although lamp monitoring can be enabled by the
Configurator)
 Optional phases always appear in manual mode
 Signals ON sequence is fixed
 Flashing period (i.e. on/off ratio and flash rate) is fixed
 Fault log flags to cause flashing or o/p bit being set, are fixed
* Since no dummy phases are available and demands for all phases are inserted on
start-up, a dummy phase cannot be configured in the all-red stage to provide a
minimum timing period. Therefore, special conditioning should be used to prevent all
moves out of stage 0 for a configurable period (using conditioning timers).