UA Part 9: Alarms and Conditions

TheReset Methodis used reset a latched Alarminstance. It is only available on an instance of an AlarmConditionTypethat exposes the LatchedState. Normally, the NodeIdof the Objectinstance is passed as the ObjectIdto the Call Service. However, some Serversdo not expose Conditioninstances in the AddressSpace. Therefore, Serversshall allow Clientsto call the Reset Methodby specifying ConditionIdas the ObjectId.The Methodcannot be called with an ObjectIdof the AlarmConditionType Node.

Signature

Reset();

The parameters are defined in Table 40

Table 37– Reset arguments

Argument	Description

Methodresult codes in Table 41(defined in Callservice)

Table 38– Silence result codes

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

Table 42specifies the AddressSpacerepresentation 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