UA Part 9: Alarms and Conditions - 5.8.5 Silence Method

TheSilence Methodis used silence a specific Alarminstance. It is only available on an instance of an AlarmConditionTypethat also exposes the SilenceState. 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 Silence Methodby specifying ConditionIdas the ObjectId.The Methodcannot be called with an ObjectIdof the AlarmConditionType Node.

Signature

Silence();

The parameters are defined in Table 40

Table 40– Silence arguments

Argument	Description

Methodresult codes in Table 41(defined in Callservice)

Table 41– 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.

Comments

If the instance is not currently in an audible state, the command is ignored.

Table 42specifies the AddressSpacerepresentation for the Silence Method.

Table 42– Silence Method AddressSpace definition

Attribute	Value
BrowseName	Silence
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule

AlwaysGeneratesEvent	ObjectType	AuditConditionSilenceEventType		Defined in 5.10.10