Rockwell Automation Publication 1756-UM004C-EN-P - June 2021 29
Chapter 3
Connect Redundant EtherNet/IP Adapters
Redundant 1756-EN4TR adapters can be used for added resiliency at the
adapter level. One adapter acts as the primary and controls the I/O, while the
other adapter acts as a secondary and can take over as the primary if needed.
Redundant Adapter functionality is available starting in revision 3.001
firmware.
Redundant Design
Considerations
There are some details and rules to consider with redundant design
considerations in the following list.
• Only I/O modules are supported in the redundant adapter chassis. The
redundant chassis does not support the following.
-motion modules
- communication modules such as DHRIO and DeviceNet
- controllers
• Redundant adapters must reside in slots 0 and 1 only.
• The fourth rotary switch on the redundant 1756-EN4TR adapter needs to
be set to number 7 for redundant adapter with DLR or single-port
topologies. Position 6 is for a redundant adapter with PRP, which will be
supported in a future firmware version.
Topic Page
Redundant Design Considerations 29
Redundant System Components 30
Redundant Switchovers 30
Configure a 1756-EN4TR Redundant Adapter Pair 32
Redundant Architecture 39
Redundant Architecture Network Considerations 41
Redundant PRP Architecture with Redbox Switches 43
ATTENTION: For redundant adapter functionality, two 1756-EN4TR adapters
must have matching configurations, including IP addresses and rotary switches,
in both slot 0 and 1.
If you are using one 1756-EN4TR adapter, it functions as one adapter.
If a redundant adapter is in slot 0 or slot 1, then both of those slots must contain
a redundant adapter. No other types of modules can be part of the pair.
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