Is it possible within an AF Analysis to check for the existance of a PI tag?
We have a requirement for an analysis of the form
IF TagExists('statusAttribute') THEN <use status attribute value> ELSE <use backup method>
but I can't see a way to do this, so I have had to revert to something like...
tagCalc = <calculation using 'statusAttribute'> backupCalc = <calculation using backup method> result = IF (BadVal(tagCalc)) THEN backupCalc ELSE tagCalc
But if the tag doesn't exist, the first calculation throws an error and the analysis gets a yellow triangle. Is there any way to do this without getting warnings?