Rockwell Automation 1756-CNB ControlLogix ControlNet Bridge Module Installation Instructions - Manual (Page 6)

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Publication 1756-IN571B-EN-P - April 2001
Understanding Standalone and Redundant Control
You can use both the 1756-CNB and 1756-CNBR modules either
standalone or in a redundant control chassis pair. For standalone
control, only one set of modules is required. For redundant control,
two ControlLogix chassis are populated with identical pairs of
modules called partners. The chassis that performs active control is
called the primary chassis and the modules in the chassis are called
primary modules. The other chassis is called the secondary chassis
and the modules in the chassis are called secondary modules. These
installation instructions discuss both standalone and redundant
control; read them carefully to distinguish the procedures and
requirements for each type of control.
IMPORTANT
If you use redundant control, you must select the
same ControlNet Network address for each set of
partner modules. You must also place the partner
module(s) in the same corresponding slot(s) in
their respective redundant control chassis pair.
Primary Chassis
Secondary Chassis
Redundant Control
Chassis Pair
I/O Chassis
1756-SRM
1756-CNB/CNBR
ControlNet
Network
1756-SRM
1756-CNB/CNBR
1756-CNB/CNBR