Rockwell Automation Publication 1769-UM021I-EN-P - May 2018 59
Install the CompactLogix 5370 L2 Controller Chapter 3
5. Push the locking tabs in.
6. If you are not using local expansion modules, slide the 1769-ECR end
cap onto the right side of the controller.
IMPORTANT You must install an end cap onto the right side of the
CompactLogix 5370 L2 controller system either at the end of the
controller. You must also install an end cap at the end of any local
expansion modules that can be installed onto the controller.