Remove OPC objects from memory
delete(Obj) removes the OPC object
Obj from memory.
Obj can be an array of
objects. A deleted object becomes invalid and you cannot reconnect it to the server
after it has been deleted, so you should remove references to that object from the
workspace with the
clear command. Deleting an object
that contains children (groups or items) also deletes these children, so you should
remove references to these children.
If multiple references to a toolbox object exist in the workspace, then deleting one object invalidates the remaining references.
Obj is an
opcda object connected to the
delete disconnects and deletes the object.
Create an OPC HDA Client, delete the object, and clear the variable from the workspace:
hdaObj = opchda('localhost', 'Matrikon.OPC.Simulation'); delete(hdaObj); clear hdaObj
Delete a group and its children from memory:
da = opcda('localhost','Matrikon.OPC.Simulation'); connect(da); grp = addgroup(da,'DeleteEx'); itm = additem(grp,'Random.Real4'); r = read(grp) delete(grp); % deletes itm as well clear grp itm
Introduced before R2006a