AnsweredAssumed Answered

Difference in Data between Historical and Analysis preview

Question asked by Faizal on Sep 4, 2019
Latest reply on Sep 13, 2019 by Faizal



I'm relatively new to PI and would like to know more about how PI stores its data.


If you currently see attached, in the first picture is data extracted using the Analysis Preview function. As you can see, value for the Batch Number is visibly available for the timestamp 8.6.2019 6:16:34.523 onwards where FVF_CIP_SIPxxxx is the value. 


If you look at the second picture which is taken from the historical screenshot for the duration, the timestamp 8.6.2019 6:16:34.523, the tag does not exist, hence no value is available. 


So, I was just wondering how is it possible that the analysis preview is able to produce the value?