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How to add values of a tag of a specific time range?

Question asked by Sandra_Torres on Mar 13, 2020
Latest reply on Mar 13, 2020 by Sandra_Torres

Good morning everyone


I'm currently working in a PI Processbook display, in wich one of the elements has to be the acumulated values of a tag from the beggining of the month to the current time. I added a PI Calculation Data with this expression  



But is not giving me the right value. 

For reference, the value should be a number above this one; 

Am I using the right function? If not, wich one I should be using? 

I searched through the Help section of PI Processbook but I didn't found what I need,.


Thank you very much in advance


-Sandra Torres