[ISS Support Case] Historian data not showing
Last updated: October 10th, 2025Description
No Historian data is displaying for any tags prior to 5/8 at about 11:00 AM. Found no errors in the SMC log or Windows System log from 5/8 at midnight through 5/10 at 11:59 PM. There was a Historian warning in the Windows App log on 5/9 at 1:00 AM "Null value / quality mismatch - value / quality is overwritten to conform with OPC specification". No events were known to have happened on 5/8 that would have caused this issue. Have requested a reboot of our Historian server at 4:30 PM this afternoon to see if the problem would be resolved by a reboot. Would just like to check and see if there is any other investigation that could be performed or any other remedy that we might be able to perform to resolve the issue in lieu of a Historian server reboot.
- Author: Kevin Modlin
- Published: October 10th, 2025
Details:
| Product: Historian |
| Version: 2020 R2 |
| Solution: [Solution is visible below when you're logged in and have a current subscription] |
| Date Created: | 05/18/2023 |
| Case: | 84460 |
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