The HelpOffNormalAlarmType can be used by devices, to inform the client about a Condition that is considered to be not normal. It is a subtype of the OffNormalAlarmType defined in OPC UA Part 9 and adds the Property Helptext to give some additional information to the operator.
Figure 19 – HelpOffNormalAlarmType Overview
Table 141 – HelpOffNormalAlarmType Definition
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Attribute |
Value |
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BrowseName |
HelpOffNormalAlarmType |
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IsAbstract |
False |
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References |
Node Class |
BrowseName |
DataType |
TypeDefinition |
Other |
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Subtype of 0:OffNormalAlarmType defined in OPC UA Part 9 |
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0:HasProperty |
Variable |
HelpText |
0:LocalizedText |
0:PropertyType |
M |
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0:HasSubtype |
ObjectType |
MonitoredParameterAlarmType |
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Servers can use the Property HelpText also in other server specific alarms which are not derived from OffNormalAlarmType.
The MonitoredParameterAlarmType is a subtype of the HelpOffNormalAlarmType and is used, if the cause of the alarm is a process variable expressed as MonitoredParameterType. It adds the Variable Status. As values, the same as defined in Table 127 are used.
Table 142 – MonitoredParameterAlarmType Definition
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Attribute |
Value |
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BrowseName |
MonitoredParameterAlarmType |
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|
IsAbstract |
False |
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|
References |
Node Class |
BrowseName |
DataType |
TypeDefinition |
Other |
|
Subtype of HelpOffNormalAlarmType |
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0:HasComponent |
Variable |
Status |
0:UInt16 |
0:MultiStateValueDiscreteType |
M |
The InputNode (defined in the AlarmConditionType) shall be set to the NodeId of the element of the MonitoredParameterType which causes the error (e.g. UpperTolerance2 if this value is exceeded by the ActualValue).