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• OPC-10000-11 – OPC Unified Architecture - Part 11: Historical Access
  6.5.4.2 Read processed functionality
  within the next ProcessingInterval . For example, this function can provide hourly statistics such as Maximum, Minimum, and Average for each item during the specified time domain when ProcessingInterval ... arrays, for example calculated value Aggregates can not be performed on arrays (e.g. Minimum , Maximum , Average …). Any Aggregate that can not be applied to an array, shall report Bad _ NotSupported
• OPC-10000-13 – OPC Unified Architecture - Part 13: Aggregates
  5.4.3.11 Maximum
  Maximum The Maximum Aggregate defined in Table 59 retrieves the maximum Good raw value within the interval, and returns that value with the timestamp at the start of the interval ... Note that if the same maximum exists at more than one timestamp the MultipleValues bit is set . Unless otherwise indicated, StatusCodes are Good, Calculated. If the maximum value