# Global Sync Mode Library - Removing a Global Sync Mode Subscription From the Distribution List

The global Sync Mode distribution list is like a subscription list. Whenever a change is made to a global Sync Mode, the change is propagated to all subscribers. The distribution list manages the subscription.

Select one Global Sync Mode check box to view the content of the distribution list. The distribution list shows all controllers subscribing to the selected Sync Mode.

To remove the subscription of a Global Sync Mode from one controller:

1. Select a controller in the Plant structure workspace .

2. Go to Sync Mode .

   The Sync Mode workspace shows a list of Sync Modes.

   The entry in the column Library link is marked with Yes for the distributed Sync Mode.

3. Select the check box for the selected Sync Mode.

4. Select Manage then Unlink from the drop-down menu.

   The entry in the column Library link is cleared for the selected Sync Mode.

5. Select Library in the left-side menu bar.

6. Go to Sync Mode library .

7. Select the check box of the removed Sync Mode.

   The distribution list is updated and the controller name is removed from the list.