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Does TagTot() in Asset-Based Analytics understand the units?

Question asked by AlistairFrith on Jan 23, 2015
Latest reply on Jan 27, 2015 by AlistairFrith

In traditional PI performance equations, TagTot has no knowledge of the actual units of the input rate tag and so makes the arbitrary assumption that the tag is in Units per DAY and the user then has to multiply the answer by the appropriate amount to convert to the real rate.


AF is supposed to be aware of the units of measure but when we use the TagTot() function in Asset Based Analytics, it seems to do the same thing as Performance Equations. Is this right?



Just found it in the AF system explorer help and yes my conclusion is correct that it is not aware of the units. I would paste the text but this text-box does not allow pasting!



The intellisense help and function description within PSE do not specify this, only the PI System Explorer help file. Are there any plans to fix this (or add "Assumes the input tag measures Units Per Day" to the intellisense and description) or provide an additional totalisation function that is units-aware?


Also, is there a function in Abacus that will simply add up the values of all the events in a time range rather than doing a time integral?


--- Alistair.