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Interpolation on back-filled archive

Question asked by PJANIN on Dec 1, 2017
Latest reply on Dec 4, 2017 by Steve Boyko


We put in place tags counter connected to an equipment in the plant.

As this equipment exists since 2012 we want to have in the history old counter values not recorded by PI archive.

We add archive for the past years (one archive file by 6 month).

We put a value at 0 when the counter start (i.e. 01/01/2012), but when we request an interpolated value for example in 01/01/2014 the returned value is 0 (the current value is 40297).

Have we missed anything ?

Do we need to put at least one value in each archive file ?