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Modbus TCP/IP, Modbus UDP/IP, and Ethernet/IP Networks


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Learn how remote I/O are used and the importance of redundancy in Ethernet I/O networks.

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Modbus TCP/IP, Modbus UDP/IP, and Ethernet/IP Networks

  1. 1. ETHERNET I/O NETWORKS Modbus TCP/IP  •  Modbus UDP/IP  •  Ethernet/IP
  2. 2. How Remote I/O Are Used PLC DCS PC Sensors Displays Relays & Actuators Network Masters Remote Slaves Field Instrumentation
  3. 3. Ethernet Control & Automation Data logger Gateway Remote I/O Micro PLC HMI DCS I/O Motion controller Drive Ethernet Switches Redundant Ring
  4. 4. Ethernet Redundancy <ul><li>There are 2 forms of Redundancy: Duplicating HARDWARE and/or Duplicating the MEDIA (Communication) Path </li></ul><ul><li>Ethernet should NOT allow simultaneous </li></ul><ul><li>MULTIPLE COMMUNICATION PATHS. </li></ul><ul><li>Network devices need added INTELLIGENCE to manage communication over duplicate paths. </li></ul><ul><li>A HUB electrically repeats an incoming message to all of </li></ul><ul><li>it’s ports simultaneously, boosting and duplicating the </li></ul><ul><li>signal in order to add more devices and extend </li></ul><ul><li>transmission distance. </li></ul><ul><li>A SWITCH learns which devices are connected to each </li></ul><ul><li>port and forwards the message to one correct port, </li></ul><ul><li>reducing traffic and preserving bandwidth. </li></ul>
  5. 5. Ethernet Redundancy <ul><li>A managed switch can DETECT REDUNDANT MESSAGE </li></ul><ul><li>PATHS, disable them, and hold them as a backup if the </li></ul><ul><li>primary path fails. </li></ul><ul><li>With an EtherStax in hub mode, a message is internally repeated to it’s second port. The redundant switch will sense the two media paths going to the same IP Address and disable one preventing multiple message loops. </li></ul><ul><li>The methods used by network switches to manage redundant </li></ul><ul><li>paths refers to their REDUNDANCY PROTOCOL. </li></ul><ul><li>The EtherStax is interoperable with these protocols: SPANNING TREE (STP), RAPID SPANNING TREE (RSTP) and most PROPRIETARY RINGS. </li></ul>
  6. 6. Simple Redundancy Connections For this example, two redundant paths are present, one between the switches, another between a switch and the EtherStax. This connection would also employ an STP or RSTP protocol. A break in either path to the EtherStax will recover communication to the opposite path in less than 15 seconds with RSTP switches . A break in either path between network switches will recover communication to the opposite path less than 1-2 seconds .
  7. 7. Proprietary Ring Redundancy Connections Ring switches connect in “circular” fashion using a proprietary protocol. This simply means that one extra link connects the last switch back to the first . In this Example, an EtherStax unit, in hub mode, is connected directly to the ring, with each port connected to a different network switch. This method of redundancy gives the fastest recovery time when used with the EtherStax. A break in any ring segment will recover communications along the opposite path in about 300 milliseconds .
  8. 8. Redundant Ring With Wireless Link <ul><li>Using the proprietary ring redundancy and radios. If radios are the primary path, recovery to wired link is ≤300ms. If wired is primary path, recovery to the radios is @ 40s or less. </li></ul>Connecting an EtherStax via an alternate wireless path using redundant ring Switches
  9. 9. Ring Redundant Trends Fault Tolerant Ethernet (FTE) Architecture Honeywell Experion Process Knowledge System (PKS) Platform With Acromag EtherStax Remote I/O EtherStax at Controller level using Modbus TCP/IP protocol EtherStax as remote I/O (below Controllers) using Modbus TCP/IP protocol
  10. 10. Network Configuration Page
  11. 11. Advanced I/O Features <ul><li>High Speed Operation – Analog (<8 mSec) & Discrete (<1 mSec) </li></ul><ul><li>Analog Integration / Totalizer – Inputs sampled every 8mSec </li></ul><ul><li>Digital Counter / Totalizer – Input rate up to 200 Hz </li></ul><ul><li>32 Bit Floating Point Configuration – Indicates exact engineering </li></ul><ul><li>units that does not require additional scaling </li></ul><ul><li>Multiple Modbus Ports – Up to 65,535 ports available </li></ul><ul><li>Dual Protocol Communications – Many models communicate with </li></ul><ul><li>both Modbus TCP/IP and Ethernet/IP simultaneously </li></ul>
  12. 12. I/O Test Page
  13. 13. Database Back Office Operations Plant Network Masters Remote I/O Slaves Can only talk to Masters Simplified Enterprise Diagram
  14. 14. No network master, no HMI software, no special drivers required. Analog messaging based on time with a 1 – 90 second period. Discrete messaging based on time and/or change-of-state (COS). Combo modules are bi-directional i2o. i2o Ethernet Peer-to-Peer
  15. 15. Analog i2o Mapping Pages
  16. 16. Digital i2o Mapping Pages
  17. 17. Industries End-user Industries: ■ Power Gen & Distribution ■ Chemical & Petro-chem ■ Water & wastewater ■ Metals processing ■ Oil & Gas Refining ■ Pharmaceutical ■ Food, Dairy, Beverage ■ Military & Aerospace System Integrators: ■ SCADA Applications ■ Factory Automation ■ Building & Energy Mgmt ■ Specialty Machinery OEM Machinery: ■ Engine & Turbine Controls ■ Switch Gear Equipment ■ Packaging Equipment ■ Boilers & Furnaces ■ Semiconductor Fab ■ Material Handling