Condition refresh
- Last UpdatedJun 26, 2025
- 1 minute read
- PI System
- Adapter for OPC UA 1.6
- Adapters
The adapter is capable of resynchronizing the latest condition states that are of interest within the server through the Condition Refresh functionality in the OPC UA specification.
This typically occurs during start-up but it is also done whenever event types are modified in the data selection or in cases such as failover.
The OPC UA adapter initiates Conditions Refresh in the following scenarios:
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After event subscription creation or modification
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Adapter startup, adapter restarts or the adapter component restarts
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After client failover
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If a RefreshRequiredEventType event notification is received by the adapter
The Condition Refresh also includes event filters already created by the adapter and results in a list of events returned by the Server, which are then processed by the adapter and egressed as a string like real-time events.