This EventType is defined in OPC 10000-3. Its representation in the AddressSpace is formally defined in Table 51.

Table 51 – SystemStatusChangeEventType Definition

Attribute			Value
BrowseName			SystemStatusChangeEventType
IsAbstract			True
References	NodeClass			BrowseName	DataType		TypeDefinition		ModellingRule
Subtype of the SystemEventType defined in 6.4.28, which means it inherits the InstanceDeclarations of that Node.
HasProperty		Variable		SystemState		ServerState		PropertyType	Mandatory

This EventType inherits all Properties of the SystemEventType. Their semantic is defined in 6.4.28. The SourceNode Property and the SourceName shall identify the system. The system can be the Server itself or some underlying system.

The SystemState specifies the current state of the system. Changes to the ServerState of the system shall trigger a SystemStatusChangeEvent, when the event is supported by the system.