Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 106)

T400 Controller Facilities Manual

667/EB/20200/000 Page 9-46 Issue 9

9.9.6 Examples Of Plans

See Figure 21.11.

9.9.6(a) Plan 0

The sequence will commence with an immediate move to Stage 1 during Group 0. If

during Group 1 there is no demand for Stage 2 then Group 2 will force an immediate

move to Stage 3 and Group 3 will hold it there. If there was a demand for Stage 2

during Group 1 (in this case just Phase C would be considered) then ROW would

change to Stage 2 and the influence of Group 2 would be overridden by inter-green

and minimum green timings. Group 3 would now hold Stage 2.

If at the start of Group 4 ROW was on Stage 3 then the influence would hold it there.

If ROW was on Stage 2 then Group 4 would force an immediate move to Stage 3.

If during Group 5 there was no demand for Stage 4 and during Group 6 there was no

demand for Stage 4 or 1 then ROW would remain on Stage 3 and Group 7 would hold

it there. If there was a demand for Stage 1 during Group 6 then ROW would change to

Stage 1 and Group 7 would hold it there. If during Group 5 or 6 there was a demand

for Stage 4 then ROW would go there and Group 7 would hold it.

This set of influences could also be used with Plans 2 and 3 with different group times

for different times of the day. (see Figure 21.10).

9.9.6(b) Plan 1

This plan would normally be used as an off-peak plan. The sequence will commence

with an immediate move to Stage 1 during Group 0 followed by an isolate period

during Group 1 in which ROW will change according to local demands and extension.

If the isolate period of Group 1 was followed directly by an immediate move to Stage

1 then it is possible that at the start of Group 0 a move had begun to a stage other than

Stage 1. Group 0 would then be taken up by an intergreen and minimum green period

which would override the influence of Group 0 and Stage 1 might never gain ROW

during Group 0. The ‘prevent’ influence during Group 2 is used to prepare for the

move to Stage 1 by holding the current stage and only allowing a move to Stage 1 if

no current extensions exist and there is a demand for Stage 1.

9.9.7 Influence Set Combinations

Because the Influence Set Combinations (see section 9.9.4) all run at identical times,

i.e. on each group output, it is possible to run more than one influence at the same

time. This has a number of uses, e.g:

1) On Parallel Stage Streaming, each stream would normally be allocated a

separate combination (see section 2.6.4) to allow different influences to

work on different streams simultaneously and to simplify identification

of each streams influences.

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