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2. TechConnect Genius Webinar
Device Level Ring Topology
Dominic Castor
Support Engineer
June 2016

3. Introduction
A DLR network is a single-point fault tolerant ring network.
Products with EtherNet/IP embedded switch technology have two ports
Currently Rockwell supports up to 50 nodes max and up to 100 meters between devices.

4. Agenda 1. Topology 2. Device Level Ring
3. DLR Guidelines and Fault Recovery
4. DLR Diagnostic Tool for Studio 5000
5. Device Level Ring AOI and Faceplate

5. Agenda 1. Topology 2. Device Level Ring
3. DLR Guidelines and Fault Recovery
4. DLR Diagnostic Tool for Studio 5000
5. Device Level Ring AOI and Faceplate

6. Star Topology
Advantage: most efficient with bandwidth, little impact if device is disconnected
Disadvantage: more wiring and switches needed

7. Linear Device-Level Topology
Advantage: minimal wiring, no external Ethernet switches required
Disadvantage: tolerance for media and equipment faults is low

8. Ring Topology Advantage: resilient connectivity, fast recovery rate
Disadvantage: configuration required

9. Hybrid Topology
This topology you can mix of different topologies together for application needs

10. Agenda 1. Topology 2. Device Level Ring
3. DLR Guidelines and Fault Recovery
4. DLR Diagnostic Tool for Studio 5000
5. Device Level Ring AOI and Faceplate

11. Device-Level Ring Topology
DLR is a layer 2 protocol that provides link-level, physical redundancy
In a DLR network it is assumed that all nodes have at least two Ethernet ports as well as embedded switch technology
The Embedded Switch Technology implements Ethernet switch features in your hardware to support high performance applications
Embedded switch technology incorporates a three-port switch
Network traffic is managed to ensure timely delivery of critical data (QoS, IGMP supported)
Quality of Service (QoS):
Provides prioritization of some packets at the expense of others
The key to QoS is the policy that is being enforced

12. Device-Level Ring Topology
1588 PTP support ensures tight synchronization for motion and CIP Sync applications.
Non-DLR devices may also be included with a device that has ring capabilities.
A DLR network is a single-point fault tolerant network.
Network still functions if there is a single break on a network
Better fault tolerance over normal star topology

13. Embedded switch Products
ControlLogix EtherNet/IP module (1756-EN2TR/ EN3TR)
Point I/O Adapter (1734-AENTR)
ArmorPoint I/O Adapter (1738-AENTR)
Flex I/O Adapter (1794-AENTR)
EtherNet/IP Tap (1783-ETAP)
ETAP enables single-port Ethernet devices to join linear or ring topology
EtherNet/IP Tap (fiber offerings)
ArmorBlock I/O options (1732E)
Kinetix 6500
Kinetix 5500
1715-AENTR
PowerFlex Drives (75x Comm card for the family)
SLC 1747-AENTR
CompactLogix L3y, L2y and L1y controllers

14. Device Level Ring Topology
A Device Level Ring is made up of Ring Supervisor and Ring Nodes:
Ring Supervisor Node
A DLR network requires at least one node to be configured as ring supervisor.
Back-up Supervisor Nodes are optional – we recommend that you configure at least one back up supervisor for you network.
With multiple Ring Supervisors in the system it will use precedence values to determine the active Ring Supervisor.

15. Device Level Ring Topology
A Device Level Ring (cont);
Ring Node
Any node that operates on the network to process data.
Ring nodes can report fault locations

16. Device-Level Ring Topology
Supervisor blocks incoming traffic on one port
Sends Beacon frames on both ports to detect break in the ring
The active ring supervisor is charged with verifying the integrity of the ring

17. Device-Level Ring Topology
Beacon interval is how often the supervisor sends a beacon on the network
Default is 400 micro seconds
Beacon timeout is how long the supervisor will wait to see return

18. Device-Level Ring Topology
After failure detection, ring supervisor unblocks blocked port
Network configuration is now a linear topology
Fault location is readily available via diagnostics

19. Device-Level Ring Topology
Link Failure which can consist of a broken or missing cable
All faults that are detectable at physical layer
Physical layer failure detected by protocol-aware node
Status message sent by ring node and received by ring supervisor

20. Device-Level Ring Topology
Once ring is restored, supervisor hears beacons on both ports, and transitions to normal ring mode, blocking one port

21. Device-Level Ring Topology
You can obtain network diagnostic information programmatically via MSG
Request all ring diagnostic information
Request a ring participant list
Request the active supervisor information
Clear rapid ring faults
Verify a fault location
Reset a fault counter
Enable and configure a ring supervisor
Initiate the Restart_Sign_On service

22. Device-Level Ring Topology
Create a MSG instruction to retrieve ring diagnostic information
Make sure destination tag is correct size to retrieve data you want
Example below is to retrieve all ring diagnostic’s
See also Literature Library, Embedded Switch Technology, RA Publication ENET-AP005

23. Agenda 1. Topology 2. Device Level Ring
3. DLR Guidelines and Fault recovery
4. DLR Diagnostic Tool for Studio 5000
5. Device Level Ring AOI and Faceplate

24. Guidelines and Fault Recovery
Use fewer then 50 nodes on a single DLR network
Configure multiple supervisor nodes per ring
Do not physically close a DLR network without a Supervisor configured on the network
Use default values for Beacon Interval, Beacon Timeout, and Ring Protocol VLAN ID.
These default values are optimized for the following configuration
50 or fewer nodes
All nodes at 100Mbps/ full-duplex
50% of the network traffic bandwidth being Ethernet/IP traffic

25. Guidelines and Fault Recovery
DLR supervisor reports a Rapid Ring Fault
5 disconnections / reconnections of a node with in 30 seconds
A duplex mismatch between devices
Electromagnetic noise on the network
Unstable physical connections
The supervisor will turn off port 2 and remain in that state even after the actual fault is no longer present.
Per ODVA standards the network with a Rapid Ring Fault cannot function properly

26. Guidelines and Fault Recovery
You can clear the rapid ring fault programmatically with a CIP generic message instruction.

27. Guidelines and Fault Recovery
You can clear the rapid ring fault in the software graphical interface by clicking Clear Fault

28. Agenda 1. Topology 2. Device Level Ring
3. DLR Guidelines and Fault Recovery
4. DLR Diagnostic Tool for Studio 5000
5. Device Level Ring AOI and Faceplate

29. Device Level Ring Tool
The Rockwell DLR tool is a free Windows based diagnostic tool
Released and distributed with Studio 5000 version 27 and up
Integrated in the Studio 5000 Tools menu
Can also be launched directly from Rockwell Automation tools folder
Can be installed later if not selected during Studio V27, V28 installation

30. Device Level Ring Tool
Tool displays the network layout with all ring participants graphically in the Ring Or Wrapping formats

31. Device Level Ring Tool
Selecting any device will display DLR configuration parameters used by that device.
In the event of a fault on the ring, the tool provides a number of visual indicators and additional options.
Selected Node Information
Supervisor Information and Capabilities
Network Fault Indicators

32. Supervisor Takeover Order Indicator
Device Level Ring Tool
Takeover Order Indicator provides visual interpretation of the Supervisor precedencies if multiple DLR nodes have Supervisor function enabled.
Supervisor Takeover Order Indicator

33. Agenda 1. Topology 2. Device Level Ring
3. DLR Guidelines and Fault Recovery
4. DLR Diagnostic Tool for Studio 5000
5. Device Level Ring AOI and Faceplate

34. Device Level Ring AOI and Faceplate
DLR_AOI is a add-on instruction that is used to gather information for a DLR network programmatically
Logic code (encapsulated in an Add-On Instruction) allows the controller to retrieve real-time DLR network status information

35. Device Level Ring AOI and Faceplate
HMI faceplate graphics allow the data to be visualized on an operator interface.
The main screen can display up to 24 nodes with optional secondary screen providing max capacity up to 46 nodes total

36. Device Level Ring AOI and Faceplate
Network Tab provides information about the network status including beacon parameters

37. References
Literature Library, Embedded Switch Technology, RA Publication ENET- AP005
Literature Library, Ethernet Design Considerations, RA Publication ENET- RM002
Rockwell Automation Knowledgebase Tech notes:
– Device-Level Ring (DLR): Diagnostic Information , Retrieving Programmatically
Using Device Level Ring Redundant Gateway
Stratix 5700 with Device Level Ring
DLR Supervisor reports a "Rapid Fault/Restore Cycle"

38. Thank You!