The HA Data Client is a purpose-built application for demonstrating OPC Historical Data (see UA Specifications Part 11 - Historical Access (http://www.opcfoundation.org/ua/part11)), and provides you with all of the aggregates that are currently defined in UA Specifications Part 13 - Aggregates (http://www.opcfoundation.org/ua/part13).
Select the aggregate group by choosing an option from the "Read Type" dropdown:
Depending upon the "Read Type" selected, the options available under the "Aggregate" field will vary as shown here:
Read Type: Raw, Modified, At
Time, Insert, InsertReplace, Replace, Remove, DeleteRaw, DeleteModified,
DeleteAtTime.
Aggregates: None.
Read Type: Processed, Subscribe,
.
Aggregates: interpolative,
average, timeAverage, total, minimum, maximum, minimumActualTime, maximumActualTime,
range, annotationCount, count, numberOfTransitions, start, end, delta,
durationGood, durationBad, percentGood, worstQuality, timeAverage2, minimum2,
maximum2, range2, worstQuality2, total2, minimumActualTime2, maximumActualTime2,
durationInStateZero, durationInStateNonZero, standardDevationSample, standardDeviationPopulation,
varianceSample, variancePopulation, startBound, endBound, deltaBounds.
All aggregates are described in UA Specifications Part 13 - Aggregates (http://www.opcfoundation.org/ua/part13).
Once you have specified the parameters for the operation (read, update, delete etc.) then you simply press the Go button to execute.