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5.8 Alarm model ToC Previous Next

5.8.5 Silence Method ToC Previous Next

The Silence Method is used silence a specific Alarm instance. It is only available on an instance of an AlarmConditionType that also exposes the SilenceState. 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 Silence 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 40 – Silence arguments

Argument Description

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

Table 41 – 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.


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

Table 42 specifies the AddressSpace representation 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

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