Allen-Bradley E Series Installation Instructions Manual page 20

20 ControlLogix ControlNet Interface Module
To prevent inadvertent reversal of the tap connections (resulting in
IMPORTANT
incorrect status displays requiring troubleshooting), check the tap
drop cable for the label indicating the attached segment before
making your connection.
To work properly, when you use modules in a redundant control
chassis pair, the primary and redundant partner modules must be
connected 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
Publication
1756-IN604A-EN-P - February 2006
Segment 2
A
Tap
A
B
Tap