64 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Chapter 2          Installation Instructions
5. Attach anchor end stops to the top of the DIN rails once all base units are 
mounted. 
Install Termination 
Assembly to I/O Base Unit
I/O termination assemblies determine the type of I/O modules that can be 
installed in a particular slot. The I/O termination assemblies provide the 
mechanism to connect the field wiring specific to the I/O module type to the 
back of one or more installed I/O modules. I/O termination assemblies are 
available in single-width and double-width varieties. A single-width I/O 
termination assembly connects the field wiring to one I/O module slot for 
simplex operation, where a double-width I/O termination assembly connects 
the field wiring to two I/O module slots for duplex/redundant operation. I/O 
termination assemblies can span I/O base unit boundaries, though the I/O 
base units must be connected directly. I/O termination assemblies are keyed so 
                I/O Base Unit
Retaining Clip
Retaining Clip
DIN Rails
Retaining Lever
Mating 
Connector
32087 M
32088 M
Typical types of end stops.