5.2.3 AggregateFilter structure overview

The AggregateFilter defines the Aggregate function that should be used to calculate the values to be returned. The AggregateFilter is formally defined in OPC 10000-4. Table 44 outlines the components of the AggregateFilter structure for the purposes of discussion in this document.

Table 44 – AggregateFilter structure
NameDescription
AggregateFilter

startTime

Beginning of period to calculate the Aggregate the first time.

aggregateType

The NodeIds of the AggregateFunction Objects that indicates the list of Aggregates to be used when retrieving processed data.

processingInterval

The period to be used to compute the Aggregate.

aggregateConfiguration

This parameter allows Clients to override the Aggregate configuration settings supplied by an AggregateConfiguration Object on a per monitored item basis.

useServerDefaults

If True the Server’s default values are used and any values specified for the other parameters are ignored.

treatUncertainAsBad

See 4.2.1.2.

percentDataBad

See 4.2.1.2.

percentDataGood

See 4.2.1.2.

useSlopedExtrapolation

See 4.2.1.2.