About this task
Each field controller has an EOL switch, which, when set to ON, sets the controller as a terminating device on the bus. See Removing the Controller cover for the EOL switch location. The default EOL switch position is Off.
To set the EOL switch on a field controller:
- Determine the physical location of the field controller on the FC bus.
Determine if the controller must be set as a terminating device on the bus.
Note: Refer to the MS/TP Communications Bus Technical Bulletin (LIT-12011034) for detailed information regarding EOL termination rules and EOL switch settings on FC buses.
If the controller is a terminating device on the FC bus, set the EOL switch to ON. If the controller is not a terminating device on the bus, set the EOL switch to Off.
When a controller is connected to power with its EOL switch set to ON, the amber EOL LED on the controller cover is lit.