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About the Tags Used by the Calculation Collector

The Calculation collector uses the following types of Historian tags in a calculation:

One or more source tags: These tags are used in the calculation formula.
One or more trigger tags: These tags trigger the calculation. Triggers can be polled (schedule-based) or unsolicited (event-based).
A single destination tag: This tag stores the result of the calculation. It is also called a calculation tag. It must be different from the source tags of the calculation. However, a destination tag can be a source tag for another calculation.

The following image shows how you can use the Calculation collector to perform a more complex calculation with several tags and multiple calculations resulting in one output tag. It also shows how the output of one calculation can be used as an input to another.