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Data behavior when getting data for regular archive points not yet arrived

Question asked by intercap on Feb 19, 2016
Latest reply on Mar 7, 2016 by pthivierge

We are creating an application that predicts a tag's next value. One of the inputs to the algorithm is based on several of the tag's recent values. As I understand it, if I as for the value of a regular archived point for "now" or for "now+ some small delta", I get Pi's estimate for the value as long as the last good value in the cache is "close enough" to "now+delta". In other words:

 

given a good reading at time T1 < '*', I can still ask for (and receive) the value TagVal(mytag,'*') as long as '*'-T1 is < some maximum delta (call it Max_delta).

 

So:

 

1) What is Max_delta?

2) How big can delta be to create a No Data error for TagVal(mytag,'*+d')?

 

Thanks.

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