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• OPC-10000-11 – OPC Unified Architecture - Part 11: Historical Access
  5.4.4 HistoricalEventNode Attributes
  HistoricalEventNode Attributes The Attributes of Objects or Views that have importance for historical Events are specified in detail in OPC 10000-3 . The following Attributes are particularly important ... HistoricalEventNode: EventNotifier OptionSet bits: HistoryRead 2 Indicates if the history of the Events is readable. (0 means not readable, 1 means readable). HistoryWrite 3 Indicates if the history