Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 206)

T400 Controller Facilities Manual

667/EB/20200/000 Page 20-1 Issue 9

20. SPECIAL CONDITIONING

20.1 INTRODUCTION

There are often special requirements for the operation of a controller which are not

covered by its normal methods of working. This is normally due to the peculiarities of

a particular intersection. For example it may be a requirement that demands for a

particular phase are inhibited during the first six seconds of appearance of another

phase, or a demand for a particular phase is inserted when there is a demand on

another phase and an extension on another, etc. This type of facility can be catered for

by Special Conditioning.

The operation required by Special Conditioning is specified at configuration and the

data is located in the configuration PROM. This data forms a special software

language which is interpreted by the T400. The types of functions that can be

performed are described below.

20.2 SPECIAL CONDITIONING OPERATORS

A large selection of controller variables can be read from Special Conditioning, and a

smaller selection of variables can be written to which will then modify the operation of

the controller. A number of logical operations can be performed on variables which

have been read. These include the logical operations of ‘NOT’, ‘AND’, ‘OR’ and

‘EXCLUSIVE OR’. Conditional and unconditional jumps can be performed. The

values of certain variables can be tested to see if they are ‘EQUAL’ to a specified value

or ‘GREATER’ than a specified value. There are Special Conditioning timers which

can be run and tested from within Special Conditioning.

20.3 SPECIAL CONDITIONING EXAMPLES

The following list is included to indicate the type and range of facilities that can be

provided by Special Conditioning:-

• Fixed time to current max

• Stages appearing more than once per cycle if many stages

• Intergreens extended by curtailed extensions

• LRT prevent moves

• Ped audibles deleted by time of day

• Dimming by time of day

• Linking to remote pedestrian controllers or other controllers

• Fault recognition of pedestrian controllers

• Limit Green timer

• Hurry call watchdog

• CLF plans affecting VA operation

• Instigation of Flash Amber Mode due to Fault

• Pelican Link

• Holding a stage with a Special Conditioning timer

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Siemens EH.75M.11. Especificaciones Pagina 206