Configure a trend using event tags

A trend can be configured to show event data from the internal Historian Event Detection/Action subsystem.

Note: This is different than Alarms and Events, which can be associated with tags received and stored in the Historian. See View alarms and events for details.

An event is the set of attributes describing the moment of satisfaction of a set of criteria on historical tag values in the AVEVA Historian. Attributes of an event include the date and time that the event occurred and the criteria that were satisfied.

An event tag is a name for an event definition in the system. Whereas these tag types are the definitions of types of variables to be stored, an event tag is a named reference for the description of how a specific change is detected and what to do if it is detected.

You can select and trend event tags like any other tag in the system. Events can also be displayed along with analog and discrete tags.