Alarm shelving restrictions and notes
This reference summarizes current restrictions, supported system scenarios, and operational notes for the IEC 62682 alarm shelving feature.
Distributed systems
Distributed systems (DIST) are not supported.
The AlertService operates only within a single WinCC OA system.
Redundancy
Redundant systems are fully supported.
The AlertService is based on the Manager Service API (MSA). It runs on both sides of a system configured for Redundancy.
The state is synchronized between redundancy partners.
After a failover, all shelving, suppression, and out-of-service states are preserved.
Sum alerts
Sum alerts are not considered for alarm shelving.
Shelving a base alert does not automatically shelve the associated sum alert.
Multi-instance alerts
For datapoints with multiple alert instances, out-of-service can only modify the alert class configuration.
The runtime behavior of existing alert instances is not affected by out-of-service for multi-instance alerts.
This is a known limitation of the current implementation.
CNS consistency
When engineering changes are made to the CNS structure, suppression and out-of-service assignments are not propagated automatically.
The AlertService provides inconsistency detection capabilities.
Verify and update suppression and out-of-service assignments after structural changes to the CNS.
