How To Replace a Failed Allen Bradley Controllogix Controller

How To Replace a Suspected Failed Allen Bradley Controllogix Controller

To replace a failed controller, you should do the following.
1. Cycle the power to the chassis.
2. Make sure the OK status indicator is solid red, and note that if the OK status indicator is not solid red, the controller does not require replacement.
3. Match the catalog numbers of the controllers and memory boards, noting that 1756-Mxxx is the catalog number of the memory board, if one is installed, and 1756-Lxxx is the catalog number of the controller.
4. Insert the battery.
5. Insert the key, and turn it to the PROG position.
6. Insert the controller into the chassis.

Firmware Revisions
To update the firmware of a controller, install a firmware upgrade kit. An upgrade kit ships on a supplemental CD along with RSLogix 5000 software. To download an upgrade kit, go to http://www.ab.com and select Product Support and Firmware Updates.


Catalog Numbers 1756-L1, 1756-L1M1, 1756-L1M2, 1756-L1M3, 1756-L55, 1756-L55M12, 1756-L55M13, 1756-L55M14, 1756-L55M16, 1756-L55M22, 1756-L55M23, 1756-L55M24, 1756-L61, 1756-L62, 1756-L63, 1756-L64, 1756-L65, 1756-M1, 1756-M2, 1756-M3, 1756-M12, 1756-M13, 1756-M14, 1756-M16, 1756-M22, 1756-M23, 1756-M24, 1784-CF64, 1784-CF128