Rockwell Automation Publication 1756-UM004D-EN-P - August 2022 35
Chapter 3 Connect Redundant EtherNet/IP Adapters
Redundant Architecture The following figures show DLR and Star Topology with the 1756-EN4TR
module. DLR provides higher resiliency than a single star. Linear topologies
are not recommended because any break or firmware updating of devices in
the line causes loss of communications to downstream devices.
Figure 2 - Redundant 1756-EN4TR Adapters in DLR Topology
1756-EN2TR
(can also be a 1756-EN4TR)
1756-EN4TR pair
Configure all DLR devices on the ring to be at the same speed on all links as
defined in the Deploying Device Level Ring within a Converged Plantwide Ethernet
Architecture design and implementation guide, ENET-TD015.
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