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Tag resolution

Question asked by tolisrouf on Feb 13, 2015
Latest reply on Mar 16, 2015 by Eugene Lee

Hello all,

 

For some tags, PI is filtering and compressing the data in such a fashion that we lose the needed resolution in the tag.Our observation is that it is for the tags that deviate very little over their full scale.An example would be a propagation feed flow meter.The feed flow is controlled +- 0.01 gpm.We change this set point in increments of 0.01 gpm.What we see on the DCS HMI is normal deviation of the flowrate around the set point.What we see in PI is a smoothed line that essentially says there is no change in flow.When we are making fine adjutments in the flow rate (0.05 gpm or less),PI does not even record the change.It simply gives us a flat, smooth line.Does anyone knows why this happens and how can we correct the problem?

 

Thank you

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