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Make copy of OPC data access object


NewObj = copyobj(Obj)
NewObj = copyobj(Obj, ParentObj)


NewObj = copyobj(Obj) makes a copy of all the objects in Obj, and returns them in NewObj. Obj can be a scalar OPC Toolbox™ object, or a vector of toolbox objects.

NewObj = copyobj(Obj, ParentObj) makes a copy of the objects in Obj inside the parent object ParentObj. ParentObj must be a valid scalar parent object for Obj. If any objects in Obj cannot be created in ParentObj, a warning will be generated.

A copied toolbox object contains new versions of all children, their children, and any parents that are required to construct that object. A copied object is different from its parent object in the following ways:

  • The values of read-only properties will not be copied to the new object. For example, if an object is saved with a Status property value of 'connected', the object will be recreated with a Status property value of 'disconnected' (the default value). You can use propinfo to determine if a property is read-only. Specifically, a connected opcda object is copied in the disconnected state, and a copy of a logging dagroup object is not reset to the logging state.

  • A copied dagroup object that has records in memory from a logging session is copied without those records.

    OPC HDA objects do not support copyobj.


Create a connected Data Access client with a group containing an item:

da1 = opcda('localhost', 'Matrikon.OPC.Simulation');
grp1 = addgroup(da1, 'CopyobjEx');
itm1 = additem(grp1, 'Random.Real8');

Copy the client object. This also copies the group and item objects.

da2 = copyobj(da1);
grp2 = da2.Group

Change the first group name, and note that the second group name is unchanged:

grp1.Name = 'NewGroupName';
Introduced before R2006a