This part of the IEC 62541 series specifies the representation of Alarms and conditions in the OPC unified architecture. Included is the Information Model representation of Alarms and conditions in the OPC UA address space.
IEC 62541-9:2012 history
0000 IEC 62541-9:2020 RLV
2015IEC 62541-9:2015 OPC Unified Architecture - Part 9: Alarms and conditions
2012IEC 62541-9:2012 OPC Unified Architecture - Part 9: Alarms and Conditions