Allen-Bradley 1756-CNB - Placement of the I;O

Publication 1756-UM523F-EN-P - December 2006
Design the System 31
Placement of the I/O
In a ControlLogix redundancy system, place all I/O in only these
locations:
• Same ControlNet network as the redundant controllers (no
bridging to I/O modules on another ControlNet network)
• DeviceNet network
• Universal remote I/O network
IO Placement
HMI – Yes
Universal Remote I/O Network
I/O – Yes
HMI – Yes
DeviceNet Network
I/O – Yes
C
N
B
D
N
B
I/O Modules
C
N
B
E
N
B
D
H
R
I
HMI – Yes
EtherNet/IP Network
I/O – No
HMI – Yes
I/O – No
ControlNet Network
Redundant Chassis Pair
Remote Chassis
ControlNet Network