Response Electronics CL6011B Especificações descarregar pdf (Página 81)

3Ć61 Theory of Operation: Self Test

Original Ć June 1990

CE4.2:CL6211

3.7.8 Recommended Minimum Free Time Value

The user should take precautions to assure that the controller free time

(loading) is never reduced below 20 percent free time. This idle time is

required to take care of the processor computations required under burst

load conditions. A burst load can be induced by many conditions, such

as the following:

H Communications load, such as asynchronous requests on multiple

communications channels happening to coincide in time.

H Controller tracking operations, which may require extra computations

internally to balance the control algorithms.

H Diagnostic and/or Tuning operations, which cause the controller to

perform extra computations concurrent with normal control algorithms.

H FST branching, where the user configuration may under certain

circumstances perform extra steps during a brief transition period.

Note that the simple fact that less than 20 percent free time has been

computed by the controller will NOT cause an integrity error to be

reported, (unless it should happen to have forced the FST execution to

exceed the FST scan rate, which would force an FST overload to be

signalled). Therefore, as part of the system configuration and

commissioning, the configuration engineer should insure that the

controller loading requirements have been met.

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Response Electronics CL6011B Especificações Página 81