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The Historian stores tag values historically and provides an audit of important events through the event log.

Historic Tag Data

Any Data Tag can be configured to store values historically. You can control the volume and frequency of data stored using configuration options: Significant change deadband, Sample Interval, Number of samples stored, and so on.

A dedicated trend display allows you to view tag data historically:

Trend showing two tags

You can also access time-stamped data from:

Event Log

Viewing the Event Log:

Three types of event are recorded in the event log:

You can access the Event Log from: