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5.8 Alarm model ToC Previous Next

5.8.4 Reset Method ToC Previous Next

The Reset Method is used reset a latched Alarm instance. It is only available on an instance of an AlarmConditionType that exposes the LatchedState. Normally, the NodeId of the Object instance is passed as the ObjectId to the Call Service. However, some Servers do not expose Condition instances in the AddressSpace. Therefore, Servers shall allow Clients to call the Reset Method by specifying ConditionId as the ObjectId. The Method cannot be called with an ObjectId of the AlarmConditionType Node.



The parameters are defined in Table 40

Table 37 – Reset arguments

Argument Description

Method result codes in Table 41 (defined in Call service)

Table 38 – Silence result codes

Result Code Description
Bad_MethodInvalid The MethodId provided does not correspond to the ObjectId provided. See OPC 10000-4 for the general description of this result code.
Bad_NodeIdInvalid Used to indicate that the specified ObjectId is not valid or that the Method was called on the ConditionType Node.
See OPC 10000-4 for the general description of this result code.
Bad_InvalidState The Alarm instance was not latched or still active or still required acknowledgement. For an Alarm Instance to be reset it must have been in Alarm, and returned to normal and have been acknowledged prior to being reset.

Table 42 specifies the AddressSpace representation for the Reset Method.

Table 39 – Reset Method AddressSpace definition

Attribute Value
BrowseName Reset
References NodeClass BrowseName DataType TypeDefinition ModellingRule
AlwaysGeneratesEvent ObjectType AuditConditionResetEventType Defined in 5.10.11    

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