Historian Creating History Blocks in the future

Richard Hart 22 days ago

I have an issue where my Historian has created 3 History blocks 4 months in the future.

It is storing a reasonable amount of valid process data there.

All platforms seem to have the correct time on them.

The Historian looks like it is struggling to manage this data and is responding poorly to data queries.

What would be the reason it stores data so far into the future.

AFAIK the time stamp of a Historized tag is determined at source on the application server where the data originates.

The Historian merges the data from all platforms and then stores the data into the appropriate block for the day.

Does anyone have any idea why this could be happening?

Thanks

Richard

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0 Phil Wood 20 days ago

Richard - did you check not only the times, but the time zones?

What PLC are you connecting to and what is the time on that?
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0 Richard Hart 15 days ago in reply to Phil Wood

Hi Phil

It is Schneider M580 PLCs and there is a possibility the RTCs in them were at their default date of some time in 1980 but I don't have confirmation of this. This has now been fixed. The time zones were also incorrect in the PLC which has also been fixed. Even so I would have thought the OPC server (OFS) would have time stamped the values with its time. Have asked if the issue is still present now.
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0 Phil Wood 15 days ago in reply to Richard Hart

So it's typically one of two things - the data source (PLC) is not providing the right time and PLC is a type that can propagate the VTQ information, as opposed to the OI server providing the time stamp.

The other thing it could be is time zone settings as the data is normally stored in UTC. Sometimes people will mess up the timezone, but put the same time, so the offset in UTC ends up being wrong.

4 months though? that seems very specific given now that we have another user mentioning it below. I'd call in to support.
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0 Richard Hart 15 days ago in reply to Phil Wood

Hmm thanks for the suggestions, will get them to check that.
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0 Richard Hart 15 days ago in reply to Phil Wood

Hmm thanks for the suggestions, will get them to check that.
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