Main Content


Event information for OPC callbacks




opccallback(Obj,Event) displays a message in the MATLAB® Command Window that contains information about an OPC event. The message includes the type of event, the time the event occurred, and the related data for that event.

Obj is the object associated with the event. Event is a structure that contains the Type and Data fields. Type is the event type. Data is a structure containing event-specific information.

opccallback is an example callback function. Use this callback function as a template for writing your own callback function. By default, @opccallback is the value for the ReadAsyncFcn, WriteAsyncFcn, and CancelAsyncFcn properties of a dagroup object, and for the ErrorFcn and ShutDownFcn properties of an opcda object.

Version History

Introduced before R2006a