Rockwell Automation 1756-RMxx ControlLogix Enhanced Redundancy System User Manual - Manual (Page 37)

Rockwell Automation Publication 1756-UM535D-EN-P - November 2012 37
Design an Enhanced Redundancy System Chapter 2
This example graphic shows the recommended method to connect an HMI to a
redundant chassis pair if connection drops are a concern in your application. In
this graphic, the remote chassis contains I/O modules in addition to the
EtherNet/IP and ControlNet communication modules. The I/O modules are
not required and included here for example purposes only.
Figure 5 - Configuration Used to Eliminate Communication Delays on Switchover
CH2 CH1 OK CH2 CH1 OK
ControlNet
EtherNet/IP
HMI
Redundant Chassis Pair