Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 68)

T400 Controller Facilities Manual

667/EB/20200/000 Page 9-8 Issue 9

9.3.3 Control Bits

See Figure 21.14

9.3.3(a) Demands - Common (DX) and Stage (D1,D2 etc.)

A ‘D’ bit simulates local demands, i.e. detectors or pedestrian push-buttons.

‘DX’ bit normally demands all phases and extends all extendible phases.

‘D’ bits normally demand and extend (where required) the phases within the specified

demand dependent stage.

The demands may be latched or unlatched as required, although normally they are

latched.

Demands for pedestrian phases do not normally illuminate the WAIT indicators,

although they may be programmed to if required.

Timing delays associated with call/cancel facilities are not applicable, although

demands may still be unlatched.

Any demands dependent on other demands may still be effective.

The demands may be programmed so that they are only effective if the appropriate ‘F’

bit is present with the ‘D’ or ‘DX’ bit.

If required it is possible to program the controller so that demands for phases may be

ignored for certain stages.

‘D’ bits may be used during CLF, VA, Bus Priority or Emergency Vehicle modes as

well as UTC mode.

In the example in Figure 21.14, ‘DX’ demands all phases and extends all extendible

phases. ‘D2’ demands and extends phase C and ‘D4’ demands phase H.

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Siemens EH.75M.11. Especificaciones Pagina 68