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Alarm Server DigitalAlarmEvaluator Error

Richard J
Getting this error in the trace logs of the alarm server
0 Error AlarmEngine DigitalAlarmEvaluator::Evaluate CLE.Tag1 Error evaluating 450
which means INVALID_TAG_DATA in the variable tag A column of the alarm config, from the preceding warning log. Tag Debug'd the tag and getting good quality and valid reads. checked everything else i could think of , can't see why the alarm server is unable to evaluate the tag.
Anyone encountered this before and resolved it ?
The post HERE seems to touch on the same but no resolution
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  • One theory is that the alarm server is overloaded and can't process the tag subscriptions in time (alarm scan time defaults to 500ms). Or it could be on the IO Side, it isn't providing the data in time, e.g. it is stale data being provided to alarm server. Check the CPU and memory usage of Alarm server IO Server. Try adjust the parameter [Alarm]Scantime to say 1000ms and see if it makes any difference.

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  • One theory is that the alarm server is overloaded and can't process the tag subscriptions in time (alarm scan time defaults to 500ms). Or it could be on the IO Side, it isn't providing the data in time, e.g. it is stale data being provided to alarm server. Check the CPU and memory usage of Alarm server IO Server. Try adjust the parameter [Alarm]Scantime to say 1000ms and see if it makes any difference.

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