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T400 Controller Facilities Manual

667/EB/20200/000 Page 9-29 Issue 9

9.4.4 Visual Indications

A separate indicating light emitting source is normally provided, behind the police

facility door of the controller. Whilst a priority vehicle is detected, the handset may be

used to determine which priority unit has been demanded.

For each priority stage equipped with an inhibit period, a display is available on the

handset to indicate that an inhibit period is running.

For each priority stage equipped with a compensation period, a display is available on

the handset to indicate a compensation period is running.

Note: The indicators above may alternatively be provided by the handset.

Handset facilities are provided at the controller to enable:

(a) A permanent priority demand to be inserted.

(b) The priority facility to be permanently disabled.

9.4.5 Interfaces

For controllers modified in accordance with MCE 0106, inputs and outputs to the

OTU will be provided as in 6.3 and 6.4. These will comply with the requirements of

MCE 0106 Section C7 and C8 respectively.

For controllers used in linked systems, and output as in section 9.4.4 will be provided.

9.4.5(a) Inputs

Optionally, an input 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.

9.4.5(b) Outputs

An output channel will be provided to indicate that stage confirmation signals may not

be as required by the computer/linking plan. Condition ‘0’ will be returned to indicate

that the controller is operating at a priority level (either bus or emergency vehicle).

A separate output channel for each bus priority stage may be specified. Condition ‘0’

will be returned to indicate the presence of a bus demand or extension.

A separate output channel for each emergency vehicle priority phase may be specified.

Condition ‘0’ will be returned to indicate the operation of an emergency vehicle

detector. (This may be used to synchronise a “green wave”).

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Siemens EH.75M.11. Spezifikationen Seite 89