Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 122)

T400 Controller Facilities Manual

667/EB/20200/000 Page 10-1 Issue 9

10. STAGE MOVEMENT RESTRICTIONS

When a specific stage change is required not to occur for safety or traffic control

reasons, it is possible to restrict the move.

The type of restrictions available are:

(a) PROHIBITED MOVE:

This is the most restrictive and the effect is for the controller to stay on the

same stage and not look for other moves until the stage change conditions are

altered.

(b) ALTERNATIVE MOVE:

With this, the restricted move is not made but an alternative stage is specified

and a move to that stage takes place.

This is less restrictive than a Prohibited Move in that the restricted move is

ignored, but the controller looks for another satisfactory stage change.

The above movement restrictions can apply in one or more modes, as specified on the

configuration sheets. Four sets of alternative and/or ignore move tables are available,

and 8 sets of Prohibited move tables.

Within the controller itself, there are two sets of movement tables, one set with the

Prohibited/Allowed moves and another set which define those prohibited moves which

are to be Ignore moves and which have alternatives. When configuring a controller, the

configuring engineer must translate the data on the customer spec sheets as follows:

For every Prohibited, Ignore or Alternative move the move should be made prohibited

in the “Prohibited/Allowed moves table”. Then in the appropriate “Alternative moves

table” the Ignore and Alternative moves should be defined.

If, in deciding a stage change, the controller encounters a prohibited move, it then

looks in the appropriate Ignore/Alternative move table to see if another movement is

possible.

WARNING

To avoid the possibility of locking-up the controller, PROHIBITED MOVES should

not be applied during modes other than Manual, UTC or CLF - IGNORE or

ALTERNATIVE MOVES should be used instead.

If SMOOTH PLAN CHANGES are required in UTC and CLF Modes, (e.g. Hong

Kong Controllers), Prohibited and Ignore moves should not be used. See Sections 9.3

and 9.9.

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