Event-based scheduling

Event-based scheduling triggers calculations when a specified point is updated with a new event value (based on snapshot events).

• Event Tag

  Enter the name of a PI point to act as the trigger tag for calculation, or click to search for tags on the Data Archive server. The event tag must be selected from the same server as the PE point being created.

  Whenever the event tag receives a new value, the PE subsystem performs a calculation and updates the value of the PE point. For example, you might want a calculation performed whenever the point sinusoid gets a new value.

• Set timestamp of resulting expression to

  Select one of two options to determine the source of the timestamp associated with each calculated PE value. In both cases the expression is computed based on current snapshot values:

  • Set the PE point timestamp to the time at which the expression is evaluated.

  • Set the PE point timestamp to match the time of the triggering event.