Rockwell Automation 1756-ENET/B ControlLogix Ethernet Communication Interface Module User Manual - Manual (Page 27)

Publication 1756-UM051B-EN-P - November 2000
Installing the Ethernet Module 2-3
Determining Module Slot Location
You can install the module in any slot in the ControlLogix chassis. You
can also install multiple ENET/B modules in the same chassis. The
figure below shows chassis slot numbering in a 4-slot chassis. In a
ControlLogix chassis slot 0 is the first slot and is always the leftmost
slot in the rack (the first slot to the right of the power supply).
Power Supply
Slot 0
Slot 1
Slot 2
Slot 3
Chassis