Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 134)

T400 Controller Facilities Manual

667/EB/20200/000 Page 13-1 Issue 9

13. LINKING

13.1 PELICAN CONTROLLER

A link to an adjacent Pelican Controller may be provided for the purpose of inhibiting

the appearance of its pedestrian stage until certain conditions occur within the Type

400 Controller, in order to prevent the intersection becoming congested.

The inhibit facility is incorporated within the Pelican Controller and the Type 400

Controller provides a signal for connection to it.

The normal method of operation is that the start or end of a nominated phase or stage

in the Type 400 Controller starts a DELAY timer, the expiry of which starts a LIFT

INHIBIT timer. The value of the DELAY timer is dependent on the layout of the

intersection but the LIFT INHIBIT timer normally has a small value (e.g. 1 or 2

seconds) and acts as a window period for demands for the pedestrian stage of the

Pelican Controller.

If a demand exists or matures during the window period, then the pedestrian stage is

allowed to gain ROW subject to the method of control of the Pelican Controller. The

inhibit is re-applied at the termination of the window period, but this will not affect the

pedestrian stage if it has gained ROW.

If the Type 400 Controller is liable to rest on a phase or stage for long periods then an

OVERRIDE timer may be provided in order to lift the inhibit in the event of the

nominated phase or stage not starting or ending.

If the lifting of the inhibit is associated with the start of the nominated phase or stage

then the OVERRIDE timer will commence timing at the end of the phase or stage and

will be reset at the start.

If the lifting of the inhibit is associated with the end of the nominated phase or stage

then the OVERRIDE timer will commence timing at the start of the phase or stage and

will be reset at the end.

The expiry of the OVERRIDE timer starts the LIFT INHIBIT timer and the process is

the same as before. The OVERRIDE timer will continue to run until reset.

The link may only be effective during certain times of the day if required.

A control bit (LL) may be transmitted from the UTC computer in order to remove the

link if required.

If the Type 400 Controller fails or is switched off then the inhibit will be lifted.

Figure 21.19 illustrates a request for a link with an adjacent Pelican Controller. Figure

21.12 and Figure 21.13 illustrate applying and removing the link at certain times of the

day (see section 12.2).

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Siemens EH.75M.11. Especificaciones Pagina 134