AnsweredAssumed Answered

PI Tag Value substituted after around 7 days.

Question asked by saraibosea on Apr 1, 2019
Latest reply on Apr 2, 2019 by LalBabuShaik

I have two tags in two PI servers(local/remote) showing the same information. They work in real time without any issues. We upto around 7 days.

When looking at historical trends, the tag value gets substituted in one of the servers with some random value. It has this problem only with this tag, other tags work fine.

This is frustrating as I had built several AF analysis based on this tag and they fail when i back populate the analysis beyond 7 days.

See the trend below , they show the same information, but stored as two tags from two servers. As you can see around the *-7d mark, one of the tags have substitute flag on them.

Bit more detail. The data gets substituted on one tag at around *-7d

Point detail . This is the good one.

This is the one getting substituted.


What can cause this behaviour? Is this related to any archiving/compression settings?