Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 110)

T400 Controller Facilities Manual

667/EB/20200/000 Page 9-50 Issue 9

should be specified. If alternatives are specified, it is preferable for the

alternative stage to be one or two stages ahead in cyclic order of the original

target stage. For example:

If the move 1-2 is not allowed

the alternative could be 1-3 or 1-4.

2. The use of the following group influences should be avoided if possible, but if

not their use, i.e. the group time and Group position within the plan, must be

considered carefully.

i) Hold

ii) Prevent

The “GO VA” influence should not be used at all as this will nearly always

cause disruption to the Synchronisation of Controller and Plan, even when used

in CLF in general.

3. Group times should be a minimum of the maximum intergreen between the

stage associated with the group influence and the stage associated with the

previous group influence. Plus the longest minimum green of the phases

appearing in the stage associated with the group.

For example, if Group 0 is an immediate move to stage 1 and Group 1 is an

immediate move to stage 2, then the minimum time for group 1 should be

longest phase intergreen between Stage 1 and 2 and longest minimum green of

phases appearing in Stage 2. Longer Group times will obviously aid

synchronisation.

9.9.8(f) Grouptime Changes

A grouptime for any group within a plan which is not in operation can be altered by

handset at anytime during the day and when the plan is subsequently introduced, it will

immediately be synchronised with any other controllers which are running the cycle

time of the new plan.

If the grouptime for a group within a plan is changed by the handset whilst the plan is

actually running, i.e. current, then in the normal CLF system, this would mean that the

controller would not be synchronised with another controller which was running the

new cycle time, unless there was a plan change away from current plan and

subsequently back to the same plan. This problem is solved in two ways.

1) Use ‘CCP’ Command (Handset)

If the operator after changing a grouptime within the current plan, enters a

‘CCP = 1’ handset command this will cause the controller to introduce the

current plan thus introducing the new grouptime(s).

2) Use Background Timer (Automatic)

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