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5.12 DeviceHealth Alarm Types ToC Previous Next

5.12.2 DeviceHealthDiagnosticAlarmType ToC Previous Next index

The DeviceHealthDiagnosticAlarmType is a specialization of the InstrumentDiagnosticAlarmType intended to represent abnormal device conditions as defined by NAMUR NE 107. This type can be used in filters for monitored items. Only subtypes of this type will be used in actual implementations. The Alarm becomes active when the device condition is abnormal. It is formally defined in Table 31.

Table 31 – DeviceHealthDiagnosticAlarmType definition

Attribute Value
BrowseName DeviceHealthDiagnosticAlarmType
IsAbstract False

Subtype of the InstrumentDiagnosticAlarmType defined in OPC 10000-9.

References NodeClass BrowseName DataType TypeDefinition Modelling Rule
HasSubtype ObjectType FailureAlarmType Defined in clause 5.12.3    
HasSubtype ObjectType CheckFunctionAlarmType Defined in clause 5.12.4    
HasSubtype ObjectType OffSpecAlarmType Defined in clause 5.12.5    
HasSubtype ObjectType MaintenanceRequiredAlarmType Defined in clause 5.12.6    

Conditions of subtypes of DeviceHealthDiagnosticAlarmType become active when the device enters the corresponding abnormal state.

The Message field in the Event notification shall be used for additional information associated with the health status (e.g. the possible cause of the abnormal state and suggested actions to return to normal).

A Device may be in more than one abnormal state at a time in which case multiple Conditions will be active.

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