About control triggers

There are two time triggers in the control palette: Interval and Daily. These objects do not represent data, but instead regularly fire a topic.

Figure 1. Control triggers


The two control trigger types are:

  • Interval fires at a regular, repeating intervals specified in its Trigger Mode property. For example, every n minutes, n hours, or whatever combination is needed.

  • Daily fires once a day at a specific time and day of the week, as specified in its Trigger Mode property. For example, at 00:00:00 (midnight) all days of week except Sunday.

Each type has even more configuration capabilities to further define the fire time.

To use a trigger, you typically link it to a selected action of a point extension (for example a control, alarm, and history) to automate an action. Often, you use a trigger as a child of a particular point (sibling to the linked extension). Or, you can have a trigger in the same container as multiple points and link it to more than one point or point extension.

For example, a Daily trigger (defined for midnight) can be linked to the Reset Elapsed Active Time action of a Discrete Totalizer extension on a Boolean writable point. In this case, that point’s Discrete Totalizer extension would only show runtime accumulated during the current day.

Other objects with trigger functions are found in various palettes. The most closely related is the TriggerSchedule object, found in the schedule palette.