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T400 Controller Facilities Manual

667/EB/20200/000 Page 9-35 Issue 9

The reasons for a request being rejected may be:

(i) The prevent timer being active.

(ii) The delay timer for the higher priority hurry call (0) being active,

(iii) Hurry call mode being disabled. (Perhaps by special conditioning, see

(d) and (e) above.)

This output may be used to activate a switching mechanism which illuminates an

indicator at the origin of the hurry call request, e.g. Fire station, or it may be used as a

confirm signal for a UTC system.

9.5.1 Priority of One Hurry Call Over Another

There are two hurry call units available 0 & 1. 0 is the higher priority call. If a request

for hurry call 1 occurs whilst the delay for hurry call 0 is timing the request for 1 is

rejected (it is not latched in by the controller).

If a request for hurry call 0 occurs during the delay or hold period for Hurry Call 1,

Hurry Call 1 is interrupted and the controller moves to serve Hurry Call 0. After

serving Hurry Call 0, the controller will return to the stage requested by Hurry Call 1,

and the hold period

is re-started.

Special Conditioning may be used to further enhance this priority of Hurry Call 0 over

Hurry Call 1 as follows. Special Conditioning may be written to prevent the Hurry Call

1 input whilst Hurry Call 0 prevent timer is active. This may then be used to ensure a

gap between hurry calls so that a controller is not unduly held up.

N.B. If the Hurry Call is inserted from a momentary pushbutton it is advisable to use a

Hurry Call Confirm output in the above instances, so that the sender knows if the

Hurry Call has been accepted.

9.5.2 Hurry Call Parallel Stage Streaming Facilities

Two Hurry Call units will be available, numbered 0 and 1, and they may be allocated to

any stage on any stream.

If they are both allocated to different stages but in the same stream, they will be

actioned on the basis of Hurry Call 0 being of higher priority than Hurry Call 1.

However, if they are allocated to stages in different streams, they can both be actioned

simultaneously, neither having precedence over the other or affecting each other in any

way.

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Siemens EH.75M.11. Spezifikationen Seite 95