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T400 Controller Facilities Manual

667/EB/20200/000 Page 9-26 Issue 9

9.4.3 Basic Facilities

Reference should be made to Figure 21.16.

Both Priority and Emergency Vehicle modes have the same facilities unless otherwise

stated.

9.4.3(a) Priority Units

There are 8 Priority Units (0 to 7) available which may be divided in any proportion

between Priority and Emergency Vehicle Mode.

If both modes are used then the following conditions are applied:

(i) The Priority Units are allocated to Priority mode first.

(ii) Emergency Vehicle mode is higher than Priority mode in the mode

priority table.

9.4.3(b) Priority Phase

Each Priority Unit is allocated a Priority Phase which may either be a real phase or

dummy phase. The Priority Phase may either be in general use or used only for the

priority facility.

9.4.3(c) Priority Demand

A Priority Demand for a Priority Phase is either created by its Priority Unit from an

SVD input or from the Revertive Priority Demand facility. The priority input may also

be used to generate a V.A. demand for the same phase such that if Priority mode is

unavailable for any reason the phase will still be serviced.

(N.B. Both priority demands and associated VA demands are latched. An Unlatched

facility may be achieved by use of special conditioning, see Configurator handbook for

further details on conditioning libraries.)

If a Priority Demand is not required, it may be disabled so that only Priority Extensions

are created. This does mean that (although not Priority demanded), when the

associated Priority phase reaches green, the controller will switch to Priority mode as

Priority extensions are present and the Priority maximum timer will time off as normal.

If Priority mode is disabled, the associated VA demands will still be entered and

serviced, and if the standard facility which is latched Priority demands is used, the

Priority demands will be stored up until Priority mode is available again.

9.4.3(d) Revertive Priority Demand

When a Priority Phase terminates with a Priority Extension active, a Revertive Priority

Demand is inserted for that Priority Phase, providing the Priority Demand facility has

not been disabled.

If the Revertive Priority Demand facility is not required, it may be disabled without

affecting the Priority Demand facility.

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