Rockwell Automation 1756-CN2_CN2R, Series B ControlLogix ControlNet Interface Module - Manual (Page 16)

To avoid accidentally reversing the tap connections, before making
your connection, check the tap drop cable for the label indicating
the attached segment. Accidental connection reversals produce
incorrect status displays and require troubleshooting.
To use modules in a redundant-control chassis pair, you must
connect the primary and redundant partner modules to the same
network segment. If you are using redundant media, connect the
channel of each partner to the same network segment.
Segment 1
Tap Tap Tap
B
A
Segment 2
A
16 ControlLogix ControlNet Interface Module
Publication 1756-IN607A-EN-P - February 2008
3. Apply power to the module and check its status.
IMPORTANT