AVEVA™ PI System™ Feedback Portal

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Status Completed
Product AVEVA™ PI Server
Categories Analytics & Calculations
Created by jdjohnstn
Created on Aug 20, 2022

RELATED IDEAS

Delayed Triggers for Analytics

We have some data analyzers in the DCS system that provide results to PI tags in a delayed fashion. Sample use case: (t+0s) valve closes, (t+30s) measurement1 sent to the DCS tag m1 (t+60s) measurement2 sent to the DCS tag m2. We need to trigger a analysis off of the valve closure, but we need  Sleep(30) command in the analytic, or the ability to set per-analytic delays, so that some are delayed by 30 or 60  seconds. Or is this possible today by other means?
  • Attach files
  • Guest
    Reply
    |     Aug 20, 2022
    There are at least two things you can do. 1) for event triggered scheduling, you can configure the specific input that you would want to trigger on. In this case, you would configure "measurement2" as your trigger input. 2) you can also consider using the Auto-recalculation feature. Auto-recalculation was designed to support late-arriving data, which applies to your "measurement1" and "measurement2".
  • Laine
    Reply
    |     Aug 20, 2022
    It would be nice to have a 'time offset' feature for event triggers similar to how periodic has an offset. Essentially when the event occurs hold the actual trigger for x number of seconds etc.