EIP 10 Commandments

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					The Ten Commandments of
Making EtherNet/IP Applications
Successful


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          EtherNet/IP – Quick Survey

• Who has done the following…
  – Used Ethernet for a computer network?
  – Used Ethernet to plug into a controller?
  – Used Ethernet for a control network?
  – Used EtherNet/IP enabled devices for messaging or programming?
  – Used EtherNet/IP enabled devices to control I/O?




                                                                     1
Network User Lifecycle


                   Design

   Upgrade                      Install

                    User
                  Lifecycle
                     Of a
 Maintain         Network          Configure


        Operate               Startup



                                               2
            #1 - Understand the System Requirements

• System Environment
  – Plant Floor I/O Control to IT Integration
  – Expandability
  – Security
• Performance
  – How much data? How fast?
• Infrastructure
  – Media, Switch, Router, Firewall, Remote Access, etc.



     The better you know the system’s requirements, the better chance you have
                            for a successful installation


                                                                                 3
       # 2 - Learn the System Environment

Critical Design Decision:




                                                           More significant impact on
   • Integrated




                                                            design considerations
                  OR
   • CIP Connected
                  OR
   • Isolated

    … with/from your corporate network


            You must choose how (and if) you want to connect your
                  control system to your corporate network



                                                                                        4
          Isolated – No Connection Between Control and
          Corporate Networks

              Enterprise Network
             Enterprise Network


                                        • Design Impacts:
                         Router            – Choose your own IP addresses
Corporate Network
                                           – Fewer performance
  Control Level                              considerations due to less traffic
                                           – Simpler security considerations


           TCP/IP




                       Switch




                                  CIP


                                                                                  5
          CIP Connected – Only CIP Traffic Moves Between
          Networks

              Enterprise Network
             Enterprise Network

                                          • Design Impacts:
                         Router
                                             – Some IP address assignment
Corporate Network                               coordinated with IT
                                             – Additional performance
  Control Level
                                                considerations
                          E     E            –• More security and access
                                                 IT and control networks
                          N     N
                          B
                          T
                                B
                                T
                                                considerationsCLX
                                                 separated by the
                                                  backplane
           TCP/IP
                                              •   CIP messages route through
                                                  the gateway
                                              •   All other types of traffic are
                       Switch                     blocked (e.g. HTTP, FTP, etc.).




                                    CIP


                                                                                    6
                Integrated – All Devices Connected to the
                Same Infrastructure

                    Enterprise Network



                                         Router
                                                        • Design Impacts:
Corporate Network                                           – High level of IP address
 Control Level
                                                              assignment coordinated with
                                                              IT                      Switch
           Switch
                                                            – High level of performance
                                                              considerations
                                                            – High level of security and
                                                              access considerations CIP

                                                         Switch
                           Switch
  TCP/IP

                                                  CIP




                                                                                               7
     #3 - Make IT Aware

                                         •   Impact of Controls traffic on the
                                             IT network
                                               – EtherNet/IP traffic type
                                                    • I/O = “implicit”
                                                    • Messaging = “explicit”
                                               – I/O traffic is multicast

                                         •   Now that EtherNet/IP is
                                             “running” the plant floor, who
                                             owns the networks?
                                               – IT staff vs. Control staff
                                               – Maintenance, upgrade,
                                                 troubleshoot
                                               – Assigning IP addresses


IT needs to know that I/O traffic is multicast packets at high continuous rates


                                                                                  8
            #4 Segment Networks Properly

• Why Segment Networks?
   –   Simplify network management
   –   Security
   –   I/O traffic vs. HMI Messaging
   –   Maximize backbone or Control network availability
• Segmentation Tools
   – Physical segment : a switch
   – Logical segment: VLAN and IP Subnets




             Proper traffic segmentation can enhance system performance


                                                                          9
           #5 - Never Use Hubs

• Hubs vs. Switches vs. Router
    – Hubs (repeaters)
       • Allow collisions
       • Broadcast all traffic to all ports
    – Switches
       • Eliminate collisions (very important for controls!!)
       • Segment traffic within an IP subnet
    – Router
       • Segregates traffic into different IP subnets




                            Always use switches and routers!!!


                                                                 10
                 #6 - Select the Switch with Proper Features

•   Choose a switch with industrial rating
                                                                           Unmanaged switches are
•   Unmanaged Switches can be used Only When:                              less expensive and often
     –   The features listed below are not needed                                  simpler
     –   No potential to overload a device with traffic
     –   Performance with multicast traffic on the network is acceptable
     –   See white paper for more info:
         http://www.ab.com/networks/ethernet/get/UnmanagedSwitches_07252005.pdf
•   Recommended Managed Switch Features
     ― Port mirroring – ability to duplicate the frames being transmitted from one port to another for
       troubleshooting
     ― IGMP Snooping – constrains multicast traffic to ports associated with particular IP multicast
       group
     ― Port diagnostics – allows troubleshooting and access to pertinent network stats
     ― Web browser – allows web access to view configuration and diagnostics                   Click For More
                                                                                                     Features


                       Ignoring the required switch features could potentially
                                          lead to problems
                                                                                                                11
             #7 - Select and Install the Right Media

• Copper
   – CAT 5e and 6 cables and connectors are recommended for industrial applications
   – UTP is generally recommended
   – STP is recommended for metal conduits and noisy environment
        • Ground one end ONLY!!!!!!!
• Fiber
   – Fiber is good for noise immunity and long distance
        • Single mode (high performance, $$)
        • Multi-mode (general purpose)
• Grounding and Noise
   – Same basic guidelines apply as other network installations
   – Refer to the EtherNet/IP Media and Installation Guide for more info (Pub #: ENET-
     IN001)

                                                                                    Click For More
                                                                                          Info




          Standard Ethernet rules and practices apply… but design carefully


                                                                                                 13
            #8 - Understand End-device Capacities

• The “bottlenecks” of a EtherNet/IP system are almost always in
  the end devices
    – Traffic usually consumes very little of the infrastructure bandwidth @
      100Mbps
• Examples of Product Capacities:

                                                                  Max
                               TCP              CIP
                                                              Frames/Sec
                            Connections      Connections
                                                                for I/O
            1756-ENBT            64              128              5000
            1756-EN2T            64              256              10000
            1734-AENT            32               20              5000




                        Not all end devices are created equally

                                                                               15
            #9 - Be Aware of Potential Security Issues

• Common Practices today:
  – Logically separate the IT / Corporate Network from the Control Network
  – Severely limit logical and physical access to the Control Network to those
    with a legitimate need (strict access policies)
  – Implement plant floor security processes, policies and procedures
  – Utilize your IT department’s standard security technology to enforce
    access policies

• Consult with the experts (RA GSS Network Services)




                     Deny access by default, permit by exception

                                                                                 16
   #10 - Don’t Hesitate to Get Help



  If you need help with…                         Go to…
Product Specific system                Solutions Architect / GSS
architecture                           Network Services
Network Concept Design
Network Installation Validation        GSS Network Services
Security, Media
Infrastructure Product Details         Switch/Router Vendors




      Time and money spent upfront will avoid heartache later!!

                                                                   17
               GSS Network Services Overview

• Key Areas Addressed                                    Common Engineering
   – Physical Media: Design, Installation                    Processes
   – Application: Performance, Validation
   – Commercial: Project Cost, Acceptance                          Design
                                                             Design per specs &
• Networks Supported
                                                             Basis for Validations
   – Ethernet, EtherNet/IP, DeviceNet, ControlNet, DH+
   – Coax, Fiber, Redundant Systems                             Installation
   – FieldBus                                            Validate installations against
• Family of Services                                       design & network specs
   –   Consulting & Design
   –   Media Validation
   –   Maintenance &Troubleshooting                              Operation
   –   Baseline Documentation                              Validate system signal
   –   Training                                            quality during operating
                                                                  conditions
                                                             Documentation

                                                                                          18
           Reference Documents

• Publications
  – ENET/IP Performance and Application Guide (Pub#: ENET-AP001)
  – ENET/IP Media Planning and Installation Guide (Pub#: ENET-IN001)
  – ENET/IP Modules in Logix5000 Control Systems User Manual (Pub#:
    ENET-UM001)
• EtherNet/IP - Take the Next Step Website:
           http://www.ab.com/networks/ethernet/next-step.html

• Check Tech Support Knowledge Base for additional information




                                                                       19
     The Ten Commandments for EtherNet/IP


1.   Understand the             6.  Select the switch
     system                         with proper features
     requirements               7. Select and install
2.   Learn the system               the right media
     environment                8. Understand end-
3.   Make I T aware                 device limitations
4.   Segment networks           9. Be aware of
     properly                       potential security
5.   Never use Hubs                 issues
                                10. Don’t hesitate to get
                                    help



      EtherNet/IP is not difficult, It’s just different!!!



                                                             20

				
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posted:10/1/2012
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