UTC System Handbook - Siemens

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System Handbook for an STC UTC System 666/HE/16940/000 faulty, to force a stage during a green wave or for traffic engineering reasons. The System allows a maximum of two (or eight) demand dependent stages per controller and the "n" is used to indicate the stage letter. The "Dn" bits can form part of a plan or can be set by operator command. (4) Part time signals - SL The "SL" control bit is used to switch part time signals on or off and the "OL" reply bit to confirm that this has happened. The facility is available through the timetable or by operator command. The System allows the sense of the "SL" bit to be configured for each junction such that one junction may use SL set to 1 to switch the signals and another use 0. (5) Solar Switch Override - SO The "SO" control bit is used to switch all the signal aspects at a junction from the dim state (normal during the day) to the bright state. This is normally used during bright sunlight to make them more visible. The facility is available through timetable, CAST or operator command. (6) Local Link inhibiting - LL The "LL" control bit is used to modify the operation of a junction that is not currently controlled. Normally it forces the junction controller from its normal off-line mode to the vehicle-actuated mode. It is available by timetable or operator command. (7) Synchronise Controller time - TS The "TS" control bit allows the System to synchronise the real time clocks of all suitably equipped MCE 0141 controllers, thus ensuring that coordination is maintained when the System is off-line. At a pre-defined time the bit is cycled through a "101" sequence by the System, and those controllers with this facility set their internal clocks to the pre-defined time on the leading edge of the second "1". This action is confirmed with the "CS" reply bit. The pre-defined times are configured for each junction individually. An additional facility can be configured for each controller such that the number of seconds' reply of the TS bit determines the day-of-week in the controller's internal clock. (8) Fallback Mode - FM This facility causes the "FM" control bit to be sent that allows the CLF mode of a controller to be disabled such that it works in VA mode when no control bits are being sent. It can be set by timetable of operator command. The controller may be configured so that the "FM" bit selects any of the fallback modes. (9) Synchronise Group Timers - SG 666-HE-16940-000.doc Issue 31 Page 34
System Handbook for an STC UTC System 666/HE/16940/000 This facility allows the synchronisation of group timers of the type fitted to STC Type 90 controllers or those of other manufacturers conforming to the same specification 9 . It switches the "SG" control bit in a similar manner to the Synchronise Controller Time Facility. However, the System uses configured information to determine when the "101" sequence should be sent to ensure synchronised control over the System. In order to use this facility the following items of data are required: (i) The time at which synchronisation occurs for all junctions in the System. (ii) The cycle time for each suitably configured junction controller (iii) The required offset from an arbitrary start point for each suitably configured junction controller. Starting at the junction with the lowest IRN 10 the System synchronises one controller at a time. For each controller it determines when the next occurrence of the required offset is due. It then toggles the SG bit in a "101" sequence so that the leading edge of the second "1" occurs on the required time. The "SR" reply bit confirms that controller has synchronised to the "SG" bit and if configured is looked for after the "SG" "101" sequence. The "GR1" bit is returned for the whole of group 1. (10) Gap Out - GO Note: licensed facility - see section 2.3. When the "GO" control bit is sent to a controller together with multiple stage force (F) bits this permits the controller to move to any of these force bits without causing a plan compliance fault to be raised. A similar effect can be achieved by inhibiting plan compliance checks in plan preparation. However, use of the Gap Out facility is normally preferable as plan compliance inhibit signifies the UTC System has reduced control over the controller. (11) Green-Wave Active - GA The "GA" control bit is sent to a junction configured with this bit whenever a green-wave is active on that junction. Its function is to inhibit any local hurry call that may override the green-wave. (12) Flashing Amber Mode - FF The "FF" control bit is sent to a junction configured with this bit to force the flashing amber mode. If configured with the FR reply bit this should be 9 The original specification was the UK DTP spec. FEB70. The current version is contained in MCE 0141. 10 The IRN is the Internal Reference Number for that equipment. It is the number by which the equipment is known within the System. If required, the IRN can be obtained by listing the data or through an operator command. 666-HE-16940-000.doc Issue 31 Page 35
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