opccallback

(Not recommended) Event information for OPC callbacks

Support for the OPC Data Access (DA) standard will be removed in a future release. Instead use OPC Unified Architecture (UA). See Compatibility Considerations.

Syntax

opccallback(Obj,Event)


Description

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

R2023b: OPC DA Support to Be Removed

Support for the OPC Data Access (DA) standard will be removed in a future release.

To access live OPC data, use the OPC Unified Architecture (UA) standard instead. See Unified Architecture.