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EventQueueOverflow Events are generated when an internal queue of a MonitoredItem subscribing for Events in the Server overflows. OPC 10000-4 defines when the internal EventQueueOverflow Events shall be generated.

The EventType for EventQueueOverflow Events is formally defined in Table 55.

Table 55 – EventQueueOverflowEventType Definition

Attribute	Value
BrowseName	EventQueueOverflowEventType
IsAbstract	True
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseEventType defined in 6.4.2, which means it inherits the InstanceDeclarations of that Node.

This EventType inherits all Properties of the BaseEventType. Their semantic is defined in 6.4.2. The SourceNode Property for Events of this type shall be assigned to the NodeId of the Server Object. The SourceName for Events of this type shall be “Internal/EventQueueOverflow”.