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Marco Brombacher

Compare tag data current vs previous scan

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I need to calculate the difference between the current tag value and its value during the previous scan.

The tag value originates from a Formula using analogue data from  a UIA-0402N Analog input and stores a Real value.

Is there a easy way to do this without using a Data Table or other FB that uses the SD card memory? 

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Hi Marco,

I am not sure about what you need...but you can use a second variable to store the value, afer that you done all that you need, or previously, then you will have an ActualValue and an OldValue

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