OPC Unified Architecture – Part 9: Alarms & Conditions
5.8.24.5 InstrumentDiagnosticAlarmType
The InstrumentDiagnosticAlarmType is a specialization of the OffNormalAlarmType intended to represent a fault in a field device. The Alarm becomes active when the monitored device experiences a fault such as a sensor failure. It is formally defined in Table 108. This Type is mainly used for categorization.