I'm using ACE to calculate special tags. Sometimes a tag has to be not valid for a while. Like the efficiency of a machine when it is not running. Just replacing it by 0 is not correct if you at a later stage take a average over time. What you need is a validation that does not take those values in account.
I would like to write to the "percent good" tag so I can block write zero's to the tag to disregard the corresponding values.
Is this possible from within PI ACE?