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I have created a PE tag that is to provide the data results for a tag as a fifteen second total. Shouldn't the tag that the PE tag writes to have the same current value as the PE tag?

BrianEBolton

We are trying to evaluate the flow with a tag that returns the flow in cfm in real time. We have a tag that does that. We created a performance equation tag that takes uses the flow tag divided by 240 to give us the 15 second flow rate. The PE tag is supposed to write the 15 second total to a tag that has the same name but with an underscore FST added to the tag name. Shouldn't the Flow_FST tag return the same value as the PE_Flow tag?

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    We are not using PItoPI or AF at this facility. I am working on trying to convince the decision makers to add AF. There is an old system in place that I am trying to mimic using the PI Historian. There is instrument tags that return data each minute and there is a script written that divides that value by 240 to give the fifteen second total. I have scan classes that are 4=15 seconds and 7=1 minute. That gives me a tag IPS:IPS_Data.I4_PLC.I4_Stack_O2_Raw_B that is for the one minute data, a PE tag PE:IPS_Data.I4_PLC.I4_Stack_O2_Raw_B_FST that I need to write the results to IPS:IPS_Data.I4_PLC.I4_Stack_O2_Raw_B_FST. I hope that makes sense.

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    We are not using PItoPI or AF at this facility. I am working on trying to convince the decision makers to add AF. There is an old system in place that I am trying to mimic using the PI Historian. There is instrument tags that return data each minute and there is a script written that divides that value by 240 to give the fifteen second total. I have scan classes that are 4=15 seconds and 7=1 minute. That gives me a tag IPS:IPS_Data.I4_PLC.I4_Stack_O2_Raw_B that is for the one minute data, a PE tag PE:IPS_Data.I4_PLC.I4_Stack_O2_Raw_B_FST that I need to write the results to IPS:IPS_Data.I4_PLC.I4_Stack_O2_Raw_B_FST. I hope that makes sense.

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