This EventType is defined in OPC 10000-3. Its representation in the AddressSpace is formally defined in Table 26.

Table 26 – AuditChannelEventType Definition

Attribute	Value
BrowseName	AuditChannelEventType
IsAbstract	True
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the AuditSecurityEventType defined in 6.4.4, which means it inherits the InstanceDeclarations of that Node.
HasSubtype	ObjectType	AuditOpenSecureChannelEventType	Defined in 6.4.6
HasProperty	Variable	SecureChannelId	String	PropertyType	Mandatory

This EventType inherits all Properties of the AuditSecurityEventType. Their semantic is defined in 6.4.4. The SourceNode Property for Events of this type shall be assigned to the Server Object. The SourceName for Events of this type shall be “SecureChannel/” and the Service that generates the Event (e.g. SecureChannel/OpenSecureChannel or SecureChannel/CloseSecureChannel). If the ClientUserId is not available for a CloseSecureChannel call, then this parameter shall be set to ”System/CloseSecureChannel”.

The SecureChannelId shall uniquely identify the SecureChannel. The application shall use the same identifier in all AuditEvents related to the Session Service Set (AuditCreateSessionEventType, AuditActivateSessionEventType and their subtypes) and the SecureChannel Service Set (AuditChannelEventType and its subtypes).