The AggregateFilter defines the Aggregate function that should be used to calculate the values to be returned. The AggregateFilte r is formally defined in OPC 10000-4. Table 7 outlines the components of the AggregateFilter structure for the purposes of discussion in this document.
Table 7 – AggregateFilter structure
|
Name |
Description |
|
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. |