
3Ć2 Theory of Operation: Operating States
Original Ć June 1990CE4.2:CL6211
3.1.3 Overload
The Computing and Interactive controllers can reach an overload
condition, indicated by error -0-" on the Operator Station, or an
error" integrity condition shown on an operator's console. This
overload condition simply means that the controller has so much work to
do, that it is not able to complete the control algorithm processing in
each scheduled interval.
The overload condition could be caused by one or more of the following:
H Control Algorithm Loading (FST configuration)
H Communications Loading (Operator Stations, DCU Polling, or
Redundancy)
Recovery from a sustained controller overload condition requires
removal of the cause of the overload. This is most normally
accomplished by modifying and downloading the controller configuration
(such as either reducing the number of points configured in the
controller, or reducing the size/complexity of the FST configuration).
For further details concerning the cause and effect of overload, see
section 3.5.4 on page 3
52 titled Communications Trade-offs (with
Control).
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