Deviation tag
When we are interested in the delta between two metrics, we can create a formula tag calculating the difference. Some typical calculations are given below.
Process value and setpoint
Process value and limit value
Process KPI and target
Process value and model prediction
Redundant sensor values
Astuce
Depending on the use case you might want to work with the absolute value of the difference. A typical example would be when we want to quantify the average or total deviation later.
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