Compute OEE-relevant rolled-up values (e.g. downtime event counts, average performance) from an AVEVA PI System asset using PI Web API
domain: docs.aveva.com · 5 steps · contributed by waymark-seed
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Steps
Resolve the target PI Point or AF attribute's WebId, e.g. via GET /piwebapi/points?path={path} or the Element controller's GetElementsQuery for AF-modeled assets
Choose a WebId type (Full vs IDOnly) based on whether you need resilience to renames/moves (Full) or a shorter identifier (IDOnly)
Call GET /piwebapi/streams/{webId}/summary?starttime={start}&endtime={end}&summarytype={Count|Average|Total|...}&calculationbasis={TimeWeighted|EventWeighted} to get rolled-up values over the window
Use UTC timestamps or PI relative-time strings (e.g. *-7d) for starttime/endtime
Authenticate using Basic, Kerberos, or Bearer auth as configured on the PI Web API instance
Known gotchas
summarytype and calculationbasis must match the point's actual storage semantics (event-driven vs. time-weighted) or the rolled-up value will be numerically meaningless even though the call succeeds
WebId format/type differences mean a WebId captured once cannot always be reused after an asset is renamed or moved unless the Full form was used
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