Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 123)

T400 Controller Facilities Manual

667/EB/20200/000 Page 10-2 Issue 9

10.1 PROHIBITED MOVES

When a move to a stage is prohibited and there is a demand for the prohibited stage,

the controller will not move to that stage and the current stage will remain active until

either of the following happens:

(i) the stage change conditions alter and a move can be made to a stage

before the prohibited stage.

(ii) the stage change condition is removed and replaced by another stage

change condition.

(iii) the stage change restriction is removed due to a mode change.

In (i), after the stage change occurs, a move to the original prohibited stage might now

be permitted.

In (ii), the only modes that could achieve this are:

Manual - by the operator seeing the prohibited move light illuminated and

selecting another stage by means of the appropriate push-

button.

UTC - by the force being removed and another one applied.

CLF - by another group influence becoming active.

In the example in Figure 21.6(a), the move 2-1 is prohibited in Manual mode, because

the indicative green arrow Phase C must terminate with Phase B (see section 3.2.3(b)),

and the move 4-3 is prohibited because of the required method of control.

10.2 ALTERNATIVE MOVES

When a move is not allowed it may be possible to specify an alternative move to a

nominated stage. The stage may either be one that is in general use or one that is used

only for the alternative move.

If the nominated stage is in general use, any move out of it will be subject to any

current stage change conditions and may not go directly to the original required stage.

If the nominated stage is used only for the alternative move then the only permitted

move to it will be from the original current stage and the only move out of it will be to

the original required stage. All other moves out of it will be restricted by specifying an

alternative move to the original required stage. This will ensure that the original

required stage is reached before any other stage change conditions are satisfied.

In the example in Figure 21.6(a), the move 4-3 is not allowed, but an alternative move

into stage 1 is required in VA, UTC and CLF modes. When Stage 1 gains ROW there

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Siemens EH.75M.11. Especificaciones Pagina 123