When you finish using your OPC
Toolbox™ Data Access objects,
delete function to remove them from memory.
After deleting them, clear the variables that reference the objects
from the MATLAB® workspace by using the
When you delete an
opcda client object, all
the group and item objects associated with the
object are also deleted. Similarly, when you delete a
daitem objects associated with that
To illustrate the deletion process, this example creates several
objects and then deletes them.
Step 1: Create several clients
This example creates several
objects using fictitious host and server ID properties.
da1 = opcda('Host1','Dummy.Server.1'); da2 = opcda('Host2','Dummy.Server.2'); da3 = opcda('Host3','Dummy.Server.3');
Step 2: Delete clients
Always remove toolbox objects from memory, and the variables that reference them, when you no longer need them.
You can delete toolbox objects using the
delete(da1) delete(da2) delete(da3)
Note that the variables associated with the objects remain in the workspace.
Name Size Bytes Class da1 1x1 636 opcda object da2 1x1 636 opcda object da3 1x1 636 opcda object
These variables are not valid OPC Toolbox Data Access objects.
ans = 0
To remove these variables from the workspace, use the
You can delete toolbox object vectors using the
You can also delete individual elements of a toolbox object vector.