Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 120)

T400 Controller Facilities Manual

667/EB/20200/000 Page 9-60 Issue 9

Similarly to select Manual mode the MANUAL mode select button is selected and if

SELECTED MANUAL CONTROL is a higher priority than the current mode then

manual mode will become operational.

If when Fixed Time, CLF, VA or Manual have been selected, they are not a higher

priority than the current mode then no change of mode will occur.

EMERGENCY VEHICLE, HURRY CALL(S) and PRIORITY modes must always

have a higher priority than VEHICLE ACTUATED mode (or FIXED TIME mode if

there is no VEHICLE ACTUATED mode) but their priority above other modes is

dependent on the required method of control of the intersection.

In the example of a mode priority table in Figure 21.8, UTC mode is the top priority.

While there are force bits present from the UTC computer this will be the current

mode. A hurry call request, the correct time of day for CLF or selection of Manual,

Fixed Time or VA will have no effect. When the computer comes off line and drops

the force bits then CLF will become the current mode, if it is the correct time of day. If

it is not then Vehicle Actuated mode will become the current mode. If CLF is the

current mode then a hurry call request will still have no effect but, selection of Manual,

Fixed Time or VA will make the relevant mode operational. The hurry call request will

only be honoured when Vehicle Actuated is the current mode.

Several different stage change conditions for different modes may be active at the same

time, but the controller will only respond to the ones of the highest priority mode.

When a change of mode occurs, the controller will respond to the current stage change

conditions of the new mode. For example, during UTC mode a CLF plan will continue

to run with the group influences having no effect. When the mode changes to CLF the

current group influences will become effective.

Changing of modes cannot override minimum green and intergreen timings.

Note: The controller must never be without a mode requested. Therefore, either VA or

Fixed Time must always be configured in the mode priority.

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Siemens EH.75M.11. Especificaciones Pagina 120