5.8.22.2 NonExclusiveDeviationAlarmType
The NonExclusiveDeviationAlarmType is a special level Alarm utilized with one or more non-exclusive states. If for example both the High and HighHigh states need to be maintained as active at the same time then an instance of NonExclusiveDeviationAlarmType should be used.
The NonExclusiveDeviationAlarmType is based on the NonExclusiveLimitAlarmType. It is formally defined in Table 101.
| Attribute | Value | ||||
| BrowseName | NonExclusiveDeviationAlarmType | ||||
| IsAbstract | False | ||||
| References | NodeClass | BrowseName | DataType | TypeDefinition | ModellingRule |
|---|---|---|---|---|---|
| Subtype of the NonExclusiveLimitAlarmType defined in clause 5.8.20. | |||||
| HasProperty | Variable | SetpointNode | NodeId | PropertyType | Mandatory |
| HasProperty | Variable | BaseSetpointNode | NodeId | PropertyType | Optional |
| ConformanceUnits | |||||
|---|---|---|---|---|---|
| A & C Non-Exclusive Deviation |
The SetpointNode Property provides the NodeId of the setpoint used in the deviation calculation. In cases where the Alarm is generated by an underlying system and if the Variable is not in the AddressSpace, a NULL NodeId shall be provided.
The BaseSetpointNode Property provides the NodeId of the original or base setpoint. The value of this node is the value of the setpoint to which an AdaptiveAlarm can be reset if rolling back algorithmic changes is desired. The value of this node usually contains the originally configured setpoint.