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Parameter activity prior to last measurement

Q: Our application is monitoring rainfall.

Is it possible to calculate if it was raining in the last 30 minutes prior to the last measurement?

A: This can be done by using a Rolling Aggregation.


Rainfall is detected by a tipping bucket.

The tipping bucket is connected to a digital input port.

Data Log interval set to 10 min.

Aggregation channel is fed by digital counter value.

Aggregation period is 30 min.

Detection output:

Use “Average” [4] or ”Rate Change” [A] for detection.

Rain in last 30 minutes is True if (one of these values) not equals to “0”.

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