16 Rockwell Automation Publication 442G-UM002B-EN-P - August 2021
Chapter 1 Product Overview
Device Level Ring (DLR) Topology
A DLR network is a single-fault-tolerant ring network that is intended for the
interconnection of automation modules without the need for more switches.
The ring topology offers these advantages:
• Media redundancy
• Fast-network fault detection and reconfiguration
• Resiliency of a single-fault-tolerant network
• Easy implementation without more hardware requirements
One DLR network can support as many as 50 nodes. A DLR network supports
copper connections (maximum of 100 m [328 ft]), fiber-optic connections
(maximum of 2 km), or a mix of copper and fiber.
Figure 12 - Example Device Level Ring Topology
IMPORTANT This section summarizes a DLR network. To plan, configure, and
monitor DLR networks, see publication ENET-AP005.
ATTENTION: The access box does not currently support time-sensitive
applications that are based on CIP Sync, including CIP Motion applications. Do
not use the access box in DLR topologies where other nodes are using CIP
Sync or CIP Motion. To be used in linear topologies, where other nodes are
using CIP Sync or CIP Motion, the access box must be connected at the end of
the line.
LNK1LNK2NET OK
EtherNet/IP
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