Deleting Digital States
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If digital states are deleted in the PI Collector, the corresponding enumerated sets in Historian are not automatically deleted without a restart of the PI collector. Unused enumerated sets cannot be automatically deleted, because the PI server does not notify the PI collector about delete activity.
To address this:
- Go to the Historian VB admin and delete the unused enumerated set at the Historian side.
For example, consider the following situation, where
PHsite1.PumpStatus in Historian is assigned to Tag1:
| PI Server | Historian |
|---|---|
Site1.PumpStatus |
PHSite1.PumpStatus |
ON= 0 |
OFF= 0 |
OFF= 1 |
ON= 1 |
If the digital state Site1.PumpStatus is deleted, then the enumerated set PHSite1.PumpStatus remains at the Historian side.
To address this:
- Go to the Historian VB admin and delete the
PHSite1.PumpStatusenumerated set, on the Historian side.