Linear topology, Device level ring topology, Linear topology device level ring topology – Rockwell Automation 842E EtherNet/IP Absolute Encoder User Manual User Manual
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Rockwell Automation Publication 842E-UM001A-EN-P May 2012
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EtherNet/IP overview
Chapter 3
Linear topology
The linear topology uses the embedded switching capability to form a daisy-
chain style network that has a beginning and an end. Linear topology simplifies
installation and reduces wiring and installation costs, but a break in the network
disconnects all devices downstream from the break. When this topology is used,
both ethernet connections on the encoder may be used. For the network
connection use Link 1, Link 2, or both.
Device level ring 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 a break in the network. If a break is detected, the signals are sent out in
both directions. With this topology, use both the Link 1 and Link 2 ethernet
connections on the 842E encoder.