7 OPC UA Types and Instances ToC Previous Next

7.11 WwEventsDispatcherType ObjectType Definition ToC Previous Next

The WwEventsDispatcherType represents a container that is an event dispatcher for machine events and is formally defined in Table 27.

Table 27 – WwEventsDispatcherType Definiton

Attribute Value        
BrowseName WwEventsDispatcherType        
IsAbstract False        
References Node Class BrowseName DataType TypeDefinition Other
Subtype of the BaseObjectType defined in OPC 10000-5          
0:GeneratesEvent ObjectType 0:BaseEventType      
0:GeneratesEvent ObjectType WwBaseEventType      

A wide variety of events and states can trigger messages on a plant, machine or component. Events and the associated messages are rather temporary and therefore cannot be subscribed directly.

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Figure 10 – Overview of Event Types

Woodworking machines do not need to provide the woodworking Types like WwBaseEventType. Instead it can be an object of any OPC UA 0:BaseEventType or a subtype of it and additionally can implement the interface IWwEventMessageType. So it is possible to use the full range of OPC UA AlarmTypes like 0:LimitAlarmType:

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Figure 11 – OPC UA AlarmTypes

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