Multistate symbol with AF attributes

Discussion created by izaias on Jul 31, 2012
Latest reply on Aug 1, 2012 by izaias

Hi guys,




I'm passing through the problem below.


I have an AF element with the attributes:


Flow: Flowtag (it’s a PI Point);


MaxProj: 50 (the maximum value the flow could reach, set manually);


 MaxHist: obtained using the flow tag with value retrieval method to get the max value that the flow tag has reached in its history. (TimeMethod=TimeRange;RelativeTime=-5y;TimeRangeMethod=Maximum)


So, Im trying to do a visual alarm in ProcessBook, using multistate symbol, based on some calculations, using those AF attributes.


I would like to use something like:


IF  Flow.tag > = MaxHist and < MaxProj then “multistate symbol get yellow”


Else if Flow.tag >= MaxProj then “multistate symbol get red”


Else “multistate symbol get green”




But Im not finding a way to implement that logic in a symbol. How should I do that?




Thank you.