6 Historical Access specific usage of Services ToC Previous Next

6.2 Historical Nodes StatusCodes ToC Previous Next

6.2.3 Semantics changed ToC Previous Next

The StatusCode in addition contains an informational bit called Semantics Changed (see OPC 10000-4).

UA Servers that implement OPC UA Historical Access should not set this bit; rather they should propagate the StatusCode which has been stored in the data repository. The Client should be aware that the returned data values may have this bit set.

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