|cbTimeWeighted||Weight the values in the calculation by the time over which they apply. Interpolation is based on the step attribute of the point. Interpolated events are generated at the boundaries if necessary.|
Evaluate values with equal weighting for each event. No interpolation is done.
There must be at least one event within the time range to perform a successful calculation.
Two events are required for standard deviation.
In handling events at the boundary of the calculation, PISDK uses following OPC standard:
1) use events at both boundaries when there is only one calculation interval;
2) include events at start time in multiple intervals and the intervals are in ascending time order;
3) include events at the end time in multiple intervals and the intervals are in descending time order.
|cbTimeWeightedContinuous||Apply weighting as in cbTimeWeighted, but do all interpolation between values as if they represent continuous data, (standard interpolation) regardless of the step attribute of the point.|
|cbTimeWeightedDiscrete||Apply weighting as in cbTimeWeighted but interpolation between values is performed as if they represent discrete, unrelated values (stair step plot) regardless of the step attribute of the point.|
|cbEventWeightedExcludeMostRecentEvent||The calculation behaves the same as cbEventWeighted, except in the handling of events at the boundary of summary intervals in a multiple intervals calculation. Use this option to prevent events at the intervals boundary from being double count at both intervals. With this option, events at the end time(most recent time) of an interval is not used in that interval.|
|cbEventWeightedExcludeEarliestEvent||Similar to the option cbEventWeightedExcludeMostRecentEvent. With this option, events at the start time(earliest time) of an interval is not used in that interval.|
|cbEventWeightedIncludeBothEnds||With this option, events at both ends of the interval boundaries are included in the event weighted calculation.|