Event=‘trigger_tag_name’ event_condition The trigger tag name must be in single quotes. For example,
Event=‘Sinuoid’ Anychange will trigger on any event to the PI Tag sinusoid as long as the next event is different than the last event. The initial event is read from the snapshot. Depending on the interface, developer-specific event conditions may be configurable. The tag name must be surrounded by the single quote and there can be no text between the second or closing single quote and the trigger keyword.
The keywords in the following table can be used to specify trigger conditions.
Trigger on any change as long as the value of the current event is different than the value of the previous event. System digital states also trigger events. For example, an event will be triggered on a value change from 0 to “Bad Input,” and an event will be triggered on a value change from “Bad Input” to 0.
Increment
Trigger on any increase in value. System digital states do not trigger events. For example, an event will be triggered on a value change from 0 to 1, but an event will not be triggered on a value change from “Pt Created” to 0. Likewise, an event will not be triggered on a value change from 0 to “Bad Input.”
Decrement
Trigger on any decrease in value. System digital states do not trigger events. For example, an event will be triggered on a value change from 1 to 0, but an event will not be triggered on a value change from “Pt Created” to 0. Likewise, an event will not be triggered on a value change from 0 to “Bad Input.”
Nonzero
Trigger on any non-zero value. Events are not triggered when a system digital state is written to the trigger tag. For example, an event is triggered on a value change from “Pt Created” to 1, but an is not triggered on a value change from 1 to “bad input.”
