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

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.

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

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

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

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

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

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

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

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

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

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

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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

References Literature Library, Embedded Switch Technology, RA Publication ENET- AP005 Literature Library, Ethernet Design Considerations, RA Publication ENET- RM002 Rockwell Automation Knowledgebase Tech notes: 452172 – Device-Level Ring (DLR): Diagnostic Information , Retrieving Programmatically 731689 - Using Device Level Ring Redundant Gateway 674013 - Stratix 5700 with Device Level Ring 494704 - DLR Supervisor reports a "Rapid Fault/Restore Cycle"

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