Configure target deviation alarms

A target deviation alarm compares the current attribute value to a target Engineering Units value. Then, the absolute value of the difference is compared to one or more alarm deviation limits expressed in EngineeringUnits.

You can individually select and configure values and priorities for the minor deviation limit and the major deviation limit. You can set individual messages for the minor and major deviation alarm limits.

The deviation alarm’s settling period is the time allowed for the attribute value to reach an expected target value after a device starts. No alarm can occur during the settling period.

You can also configure a value for a deviation deadband, which is expressed in Engineering Units. The deadband range sets a threshold that an attribute value must change from a deviation limit to reset the alarm to the inactive state.

The timestamp when a deviation alarm becomes active or inactive is the most current timestamp of the corresponding input value. If there is no timestamp associated with the alarmed value, the AppEngine timestamp is used instead.