Deleting Digital States
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.