Rockwell Automation 1756-CNB ControlLogix ControlNet Bridge Module, Series E Installation Instructions - Manual (Page 7)

ControlLogix ControlNet Interface Module 7
Publication 1756-IN604A-EN-P - February 2006
Understand Standalone and Redundant Control
You can use the 1756-CNB and 1756-CNBR Series E modules as standalone
or in firmware version 11.xx as redundant control. 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 modules in the same corresponding slots 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
1756-CNBR
1756-CNB
1756-CNBR
1756-CNB
1756-CNBR