Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 25)

T400 Controller Facilities Manual

667/EB/20200/000 Page 2-5 Issue 9

All stages contained within a stream must be numbered consecutively starting at Stage

0 for Stream 0.

If a stream requires an all red condition then a separate all red stage must be provided

for that stream. No phase may appear in more than one stream.

2.6.3 Mode Selection

Each stream will independently run the highest priority mode for which a request

exists, except in the case of Manual and Part Time modes. (See also section 9.12).

Manual mode will be operated on all streams simultaneously and will be operative only

if Manual has been selected from the Manual Panel and no higher priority mode is

running on any stream. If Manual Mode has been selected and one or more streams

runs a higher priority mode, then Manual Mode will not be operational on any stream.

Any stream not running a higher than Manual priority mode will run a lower than

Manual priority mode.

Part Time Mode will always be placed in the top priority position and, when requested,

will be implemented on all streams simultaneously.

Each mode, with the exception of Manual and Part Time, may be configured so that it

is disabled on an individual stream. Manual and Part Time may be disabled but would

be disabled on all streams simultaneously. The modes may be disabled as a standard

configuration item but may also be enabled or disabled on a per stream basis via

Special Conditioning.

Forms IX & IXa allow for modes to be disabled permanently, and operation of certain

mode select buttons to be made inoperative permanently.

However, some situations do not require the above-mentioned items deleted on a

permanent basis, rather only under special conditions.

For example, on a two stream controller, if VA was not required on Stream 1 but was

required on Stream 2, the mode could be permanently disabled for Stream 1. However,

the selected VA position of the mode select buttons could not be made permanently

non-operative, and similarly neither could the ‘Selected Fixed Time/VA’ mode on form

IXa. As Selected Fixed Time will be required on Stream 1 (where VA is not required)

and both selected VA and Selected Fixed Time may be required on Stream 2. In this

instance, Special Conditioning is required to disable the ‘Selected Fixed Time/VA’

mode on Stream 1 when the VA mode select button is pressed (see also Section 4.4.4).

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