Response Electronics CL6011B Especificaciones descargar pdf (Pagina 71)

3Ć51 Theory of Operation: Communications

Original Ć June 1990

CE4.2:CL6211

3.5.2 Maintenance Data Communications

Certain request messages can be categorized as related to maintenance

of the controller operation. These request messages are called

Maintenance Data communications. Some examples include:

H Tuning

H Trace

H Download / Upload

When the Regulatory Controllers receive a request for Maintenance Data,

this message is processed at a lower priority internally than the Control

Task. This allows the normal control action of the Regulatory Controller

to be performed without being interrupted by the overhead necessary to

respond to the maintenance request message. (Note that certain

maintenance request messages will interact directly with the execution of

the Control Task, such as the Trace single-step function and download.)

Any Maintenance Data request that simply accesses information will

cause the Regulatory Controller to respond with the latest information

recorded within the controller. Any Maintenance Data request that will

cause a change to one of the controller's internal parameters (e.g. DDP

change request) will cause a response message to be generated to the

requestor and, if the change request was successful, this changed

parameter will be buffered internally to be acted on by the Control Task at

then next opportunity (e.g. the next FST scan cycle).

3.5.3 Task Priorities

The Regulatory Controllers treat each action that is required under the

following priority structure. Any higher priority action will interrupt" a

lower priority action in progress.

Priority Rank Internal Task to Perform

Higher Priority Process Data Communications Task

Control Task

Maintenance Data Communications Task

Lower Priority Self Test Task

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Response Electronics CL6011B Especificaciones Pagina 71