Ring Topology - Danfoss EtherNet/IP iC7 Series Operating Manual

iC7 Series EtherNet/IP
Operating Guide
Overview
Illustration 3: Example of Star Topology

2.5.3 Ring Topology

Ring topology enables the same simpler cabling and reduced cabling costs as line topology, but also reduces the damage caused
by a single cable failure in a similar manner as star topology.
The ring topology protocol depends on the protocol in use.
For EtherNet/IP, the device level ring (DLR) is used. A DLR network consists of an active ring supervisor and any number of ring
nodes. The iC7 drive acts as a ring node with its 2 Ethernet ports X1/X2. The ring supervisor is typically a PLC and it is responsible for
generating a beacon at regular intervals. The DLR protocol contains several fault detection and ring recovery mechanisms. The ring
supervisor is capable of blocking traffic on 1 port to avoid loops, faults are detected when beacon traffic is interrupted, and/or link/
node failure is detected by adjacent nodes. Any DLR related settings are handled via the ring supervisor.
N O T I C E
Do not use non-DLR compliant devices throughout the DLR domain.
Illustration 4: Example of Ring Topology
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