Tag Historian Functions

Retain historical tag values to review, troubleshoot, or analyze data over time.

Note  

The 19.5 Tag Historian API does not work with 19.6 SystemLink Server or later. However, the 19.6 Tag Historian API works with all versions of SystemLink as well as the 19.5 Tag Historian API.

Defines the range of historical tag values to read with Read Tag History or Multi Read Tag History.

Returns the historical values from a single tag. The data type of the tag must match the polymorphic instance.

Returns the historical values from multiple tags in a single operation.

Defines how long a tag retains historical values.