Rockwell Automation 1715-OF8I Redundant I/O System User Manual - Manual (Page 29)

Rockwell Automation Publication 1715-UM001C-EN-P - March 2014 29
Redundancy System Overview Chapter 1
Ethernet Topology
The 1715 Redundant I/O System supports DLR (Ring) and Star Topologies.
For a DLR (Ring) Topology, the adapter modules’ Ethernet ports are configured
with the outward-facing ports (Port 1 of Module A and Port 2 of Module B)
operating as a 2-port switch. Port 2 of Module A and Port 1 of Module B are
chained together.
Figure 9 - DLR (Ring) Ethernet Topology
Module Status
Redundancy Status
Network Status
Rack Status
Ethernet 1
Ethernet 2
Reset
Ethernet 1
Ethernet 2
Reset
Module A
Port 1
Port 2
Module B
Port 1
Port 2
Module Status
Redundancy Status
Network Status
Rack Status