Rockwell-automation 56RF RFID System User Manual User Manual download pdf (Page 37)

Rockwell Automation Publication 56RF-UM001A-EN-P - October 2011 37

EtherNet/IP Addressing Chapter 4

Device Level Ring (DLR)

Topology

A DLR network is a single-fault tolerant ring network intended for the

interconnection of automation devices. DLR topology is advantageous as it can

tolerate a break in the network. If a break is detected, the signals are sent out in

both directions. When this topology is used, both EtherNet connections are

used. The network connection to Link 1 or Link 2 does not matter.

Rockwell Automation recommends that you use no more than 50 nodes on a

single DLR, or linear, network. If your application requires more than 50 nodes,

we recommend that you segment the nodes into separate, but linked, DLR

networks.

With smaller networks:

• there is better management of traffic on the network.

• the networks are easier to maintain.

• there is a lower likelihood of multiple faults.

Additionally, on a DLR network with more than 50 nodes, network recovery

times from faults are higher. The maximum cable length between devices cannot

exceed 100 m (328 ft).

For more information on setting up and configuring a DLR network, please refer

to ENET-AP005.

Figure 11 - DLR Topology

RFID

Interface

Block

RFID

Transceivers

RFID

Transceivers

RFID

Interface

Block

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Rockwell-automation 56RF RFID System User Manual User Manual Page 37