Determine module slot location – Rockwell Automation 1756-CNB ControlLogix ControlNet Bridge Module Installation Instructions User Manual
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Publication 1756-IN571B-EN-P - April 2001
Determine Module Slot Location
The figure below shows chassis slot numbering in a 4-slot 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). You can use any size 
ControlLogix chassis and install the module in any slot. You can also 
install multiple 1756-CNB/R modules in the same chassis. You can 
install as many modules as your power supply can accommodate 
(i.e., number for which the power supply is rated).
IMPORTANT
If you plan to install a redundant system, you 
must place the primary and redundant module(s) 
in the same corresponding slot in their respective 
chassis. For example, if you place a 1756-CNBR 
module in slot 3 (from the left) in the primary 
chassis, you must also place a 1756-CNBR module 
in slot 3 in the redundant chassis.
Chassis
Power Supply
Slot 0
Slot 1
Slot 3
Slot 2