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(To be removed) Disconnect and delete all OPC objects

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


opcreset -force


opcreset disconnects and deletes all OPC objects. This command flushes any data stored in the buffer, cancels all asynchronous operations, and closes any open log files.

You cannot reconnect a toolbox object to the server after you delete the object. Therefore, you should remove these objects from the workspace with the clear function.

Note that you cannot call opcreset if an OPC Data Access Explorer session is open, or if Simulink® models containing OPC blocks are open. Before calling opcreset, close all OPC Data Access Explorer sessions and all open Simulink models containing OPC blocks.

opcreset -force closes all OPC Data Access Explorer sessions and all Simulink models containing OPC blocks, without prompting to save those sessions and models. If you use the -force option, you lose any unsaved changes to those sessions and models. Use the -force option only as a last resort.


Create an opcda object, and add a group to that object. Then delete the OPC objects using opcreset, and clear all variables from the workspace.

da = opcda('localhost','Dummy.Server');
grp = addgroup(da);
opcreset;  % Deletes all objects
% Clear the variables
clear da grp

Version History

Introduced before R2006a

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See Also