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expression periodic every 5 seconds I read an source tag and write it to an output tag

Question asked by RonaldDuinmeijer on Nov 15, 2016
Latest reply on Nov 16, 2016 by Guilherme Ferreira

I have an periodic expression running every 5 seconds which reads an source tag and write this value to an output tag.
After that I compare the source tag and the output tag.
I expect them to be almost the same but I get a bigger difference then I expected.
What is the best way to do this?