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Appendix A
Understanding Other Application Options
DLR Network Topology
A DLR network topology is a single-fault-tolerant ring network in which DLR-capable
Allen-Bradley devices use embedded technology and dual EtherNet/IP ports to establish a
network that is resilient to single points of failure, recovers faster when single faults occur, and
does not require switches.
Configuring a DLR network topology requires you to complete a few tasks that do not apply to
using a CompactLogix 5370 L3 controller in a linear or star network topology. For example, a
DLR network topology requires that one supervisor-capable network device be configured as
the active ring supervisor. CompactLogix 5370 L3 controllers are supervisor-capable devices on a
DLR network.
This graphic shows a DLR network topology with a CompactLogix 5370 L3 controller.
Computer Connected via a
CompactLogix 5370
1783-ETAP EtherNet/IP Tap
L3 Control System
PanelView Plus Terminal
Kinetix 350 Drive
Connected via a1783-ETAP
Connected via a1783-ETAP
EtherNet/IP Tap
EtherNet/IP Tap
Kinetix 5500 Drives
1734-AENTR POINT I/O
EtherNet/IP Adapter with
PowerFlex 755 Drive Connected via a
POINT I/O Modules
1783-ETAP EtherNet/IP Tap
80
Rockwell Automation Publication IASIMP-QS023B-EN-P - December 2012
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