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• OPC-10000-13 – OPC Unified Architecture - Part 13: Aggregates
  5.4.2.2 Generating intervals
  intervals for each Start and End time combination. The range is defined to be |End - Start|. All Aggregates return a timestamp of the start of the interval unless otherwise noted ... particular Aggregate . Table 49 - History Aggregate interval information Start/End Time Interval Resulting intervals Start = End Int = Anything No intervals. Returns a Bad_InvalidArgument StatusCode , regardless of whether there is data