Rockwell Automation 57C400-1 115V AC/DC Input Module - Manual (Page 33)

EĆ3
Remote I/O Definition
This section describes how to configure the module when it is located in a rack
that is remote from the processor module referencing it. Refer to the figure below.
Processor Module
Remote I/O Master
Drop 0
I/O Module
Remote I/O Slave Drop 7
Master Rack
Remote I/O Slave Drop 2
Remote I/O Slave Drop 1
Module in a Remote Rack