Event tags

An event tag is a name for an event definition in the system. For example, if you want to detect an event when a tank temperature reaches 100 degrees, you can define an event tag and name it "TankAt100." Event tags differ from the other tag types in the AVEVA Historian (analog, discrete, and string). Analog, discrete, and string tag types are the definitions of variables to be stored. In contrast, an event tag is a named reference for the definition of the specific event you want to detect, including an optional action to perform when the event is detected. An event tag provides a way to reference all event definition information in the system.

Event tags are created and maintained using the Operations Control Management Console. When you define an event tag, you must specify:

• A name, description, and other general configuration information.

• The event criteria, which describes the conditions that must exist for the event and how often the Classic Event subsystem checks to see if an event occurred.

• Whether or not to log the event detection.

• Whether or not to enable or disable event detection.

• An optional action that is triggered when an event is detected.