Rockwell Automation 1756-RMxx ControlLogix Enhanced Redundancy System User Manual - Manual (Page 83)

Rockwell Automation Publication 1756-UM535D-EN-P - November 2012 83
Configure the EtherNet/IP Network Chapter 4
This figure shows an example enhanced redundancy system, revision 19.052 or
later, using CIP Sync technology.
Use of ControlNet is not required when using CIP Sync technology in an
enhanced redundancy system. It is included in this figure for example purposes.
Figure 20 - Enhanced Redundancy System, Revision 19.052 or later, Using CIP Sync Technology