Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 46)

T400 Controller Facilities Manual

667/EB/20200/000 Page 5-1 Issue 9

5. CALL/CANCEL

5.1 GENERAL

There are up to 8 call/cancel units (0 to 7) available which may be used for turning

movements or in conjunction with queue loops or switched facilities.

The input to a unit must remain active for the call period before the output goes active,

and inactive for the cancel period before the output returns to the inactive condition.

If the call/cancel unit is used for a turning movement, then the output would be

configured to insert an unlatched demand for the appropriate phase to allow for it to be

cancelled.

The call and cancel delay times that are programmed may be changed via the handset

using the DCL and DCN commands.

The timing range of both the call and cancel period is 0 to 255 seconds in 1 second

steps.

In the example in Figure 21.7, detector loop C1 must be occupied for 3 seconds for the

demand for Phase C to be inserted and unoccupied for 3 seconds for the demand to be

cancelled.

5.2 CALL/CANCEL - METHODS OF USE

BHS

AHS

STAGE 1

STAGE 2

(Only phases and

stages relevant to

call/cancel are shown)

In this situation the controller can be configured to operate in various ways as shown,

where

AX - always calls and extends phase A.

BX - 1) extend stage 1 only, or

2) extend stage 1 until call for stage 2 then extend stage 2, or

3) extend stage 1 and stage 2

CX - a call/cancel that demands and extends stage 2

Note:- A demand for stage 2 may or may not be dependant on a side road demand. If it

is not, then a backwards move from stage 2 to 1 via all red must be allowed.

For details on the high-speed detectors AHS and BHS, see section 6.11.

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Siemens EH.75M.11. Especificaciones Pagina 46