40 Rockwell Automation Publication 1756-UM004D-EN-P - August 2022
Chapter 3 Connect Redundant EtherNet/IP Adapters
PRP Architecture without
RedBox Switches
PRP must be properly designed, built, and configured based on CPwE
guidelines. For more information, see the Deploying Parallel Redundancy
Protocol within a Converged Plantwide Ethernet Architecture Technical Data.
With Studio 5000 Logix Designer application version 34 and later, and
1756-EN4TR firmware 4.001 and later, the 1756-EN4TR can be used in the
ControlLogix® 5580 redundant chassis pair.
• The 1756-EN4TR cannot be placed in a ControlLogix 5570 redundant
chassis pair.
• Redundant 1756-EN4TR adapters can also be placed in the remote I/O
chassis, as they could starting with firmware 3.001.
• RedBox switches are no longer needed because the 1756-EN4TR natively
supports PRP with firmware 4.001 and later.
Follow these guidelines:
• Use EtherNet/IP modules that support the redundant adapter feature.
• Connect the redundant adapters in the I/O chassis to LAN A and LAN B.
Figure 7 - PRP Network with Redundant Adapters
LAN A
LAN B
1756-EN4TR Redundant Adapter Pair
1756-EN4TR as a single adapter
1756-EN4TR
1756-EN4TR
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