Siemens EH.75M.11. Spezifikationen PDF herunterladen (Seite 102)

T400 Controller Facilities Manual

667/EB/20200/000 Page 9-42 Issue 9

need to be carefully considered, if synchronisation with the rest of the system is to be

achieved.

With the alternative method, when a plan is introduced, the controller works out which

group would be running if the Plan had been running (starting with group 0) from a

fixed time of the day, 2.00 a.m. The controller then starts at that group and continues

from there. Within 3 cycles, the controller should be synchronised with influences of

the Groups. Because every controller is introducing plans as if the Plans had all been

running since the same base time 2.00 a.m., the actual time of Plan introduction is no

longer critical.

(N.B. Certain contracts with this alternative method of Plan introduction require that

from introduction of a plan the controller be synchronised with the group influences

within 3 cycles of the Plan, and that during this Synchronising period, none of the stage

durations should be more than 1.5 times, their normal duration under the Plan. This

places certain constraints on the construction of the Plans, see section 9.9.8(e).)

For example, at a simple intersection (see Figure 9.5), a plan allocates 30 seconds

vehicle flow to the main road (Group 0) and 15 seconds to the minor road (Group 1)

for a cycle time of 45 seconds. Under this plan the controller cycles continuously

between main road and minor road flows at 30/15 second timings under precise mains

(or other source) synchronized control. Within the group timing allocated the

red/amber/green sequence is a function of the main controller software.

Figure 9.5 - SIMPLE INTERSECTION WITH CLF

MAIN RD

(30 Secs)

MAIN RD

(40 Secs)

MINOR RD

(15 Secs)

MINOR RD

(20 Secs)

PLAN 0 PLAN 1

GROUP 0 GROUP 0GROUP 1 GROUP 1

GROUP 0 GROUP 1

PLAN 0 30 SECS 15 SECS

PLAN 1 40 SECS 20 SECS

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 ... 307 308

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Siemens EH.75M.11. Spezifikationen Seite 102