6 Historical Access specific usage of Services ToC Previous Next

6.5 HistoryData parameters returned ToC Previous Next

6.5.1 Overview ToC Previous Next

The HistoryRead Service returns different types of data depending on whether the request asked for the value Attribute of a Node or the history Events of a Node. The historyData is an Extensible Parameter whose structure depends on the functions to perform for the HistoryReadDetails parameter. See OPC 10000-4 for details on Extensible Parameters.

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