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PI DataLink Calculated Data filtering problem

Question asked by mbex7am5 on Nov 5, 2016
Latest reply on Nov 29, 2016 by mbex7am5

Hi PI team,

 

I am having a problem with filter expression implementation for totalization with calculated data.

The totalization is for flow rates. When there is no flow some of the flow meters indicate negative values which are just noise.

So I usually use filter expression to filter out negative values because PI totalizer adds up negative values as well e.g. 'tagname'<0 . But sometimes there are bad values during the totalization period and calculated data function throws "[-11101] All data events are filtered in summary calculation".

 

is there any filter expression i can use to filter out negative values and bad (nonnumeric) values as well?

 

Thanks in advance. Really looking forward for you help.

Adilbek

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