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RAPIEnet
RAPIEnet
Protocol Information
Type of NetworkOpen Real-time Ethernet
Physical LayerIEEE 802.3, Ethertype 0x88fe
Network TopologyRing or Line topology
Device AddressingDIP switch or hardware/software
Network ConfigurationAutomatically done by protocol

RAPIEnet (Real-time Automation Protocols for Industrial Ethernet) was Korea's first Ethernet international standard for real-time data transmission. It is an Ethernet-based industrial networking protocol, developed in-house by LSIS offers real-time transmission and is registered as an international standard. (IEC 61158-3-21: 2010, IEC 61158-4-21: 2010, IEC 61158-5-21: 2010, IEC 61158-6-21: 2010, IEC 61784-2: 2010, IEC 62439-7)

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Features

  • An embedded Ethernet switch with two ports enables the network expansion in a daisy chain without the need for an additional external switch, easy installation and wiring reduction.3
  • 100 Mbit/s - 1 Gbit/s transmission speed, allowing electrical and optical media to be used together.45
  • Supports transmission modes such as Unicast, Multicast, and Broadcast.6
  • Supports "Store & Forward”and “Cut Through” switching.7

RAPIEnet Technology

Protocol Stack Structure

Embedded dual port switch motion

  • An embedded hardware-based switch is adopted for real-time data transmission.
  • With the full-duplex communication support, each node has dual link routes in a ring topology.

Frame Format

  • RAPIEnet Ether type: 0x88FE8

Topology

Recovery System

  • With an embedded switch and full-duplex, it has dual link routes and communication fault tolerance, enabling fast recovery capabilities.
- Recovery time < 10 ms9
  1. Transmits signal from Device 1 to Device 3.
  2. A fault occurs between Device 2 and Device 3.
  3. Notify the fault from Device 2 to Device 1.
  4. Transmits signal back from Device 1 to Device 3.

Flexible Hybrid Structure

  • Fiber Optics/Copper Media
- Copper: Low installation costs with relatively big noise. - Optics: High installation costs with low noise and relatively long wiring.
  • Simple and efficient wiring is available by combining the features of two wires that have advantages and disadvantages.

System Diagram Using RAPIEnet

Acquired Standards

International Standards

  • IEC 61158-3-21: 2010, Industrial communication networks - Fieldbus specifications - Part 3-21: Data-link layer service definition - Type 21 elements.10
  • IEC 61158-4-21: 2010, Industrial communication networks - Fieldbus specifications - Part 4-21: Data-link layer protocol specification - Type 21 elements.11
  • IEC 61158-5-21: 2010, Industrial communication networks - Fieldbus specifications - Part 5-21: Application layer service definition - Type 21 elements.12
  • IEC 61158-6-21: 2010, Industrial communication networks - Fieldbus specifications - Part 6-21: Application layer protocol specification - Type 21 elements.13
  • IEC 61784-2: 2010, Industrial communication networks - Profiles - Part 2: Additional fieldbus profiles for real-time networks based on ISO/IEC 8802-3.14
  • IEC 62439-7, Industrial communication networks - High availability automation networks - Part 7: Ring-based Redundancy Protocol (RRP) 15

Others

Other international standards in process

  • IEC 61784-5-17, Industrial communication networks - Profiles - Part 5-17: Installation of fieldbuses - Installation profiles for CPF 17 (to be registered as an IEC international standard in 2012)16

References

  1. IEC 61158-4-21: 2010 http://webstore.iec.ch/preview/info_iec61158-4-21%7Bed1.0%7Den.pdf ↩

  2. RAPIEnet related articles http://www.upkorea.net/news/articleView.html?idxno=19909 ↩

  3. IEC 61158-4-21: 2010 http://webstore.iec.ch/preview/info_iec61158-4-21%7Bed1.0%7Den.pdf ↩

  4. IEC 61158-4-21: 2010 http://webstore.iec.ch/preview/info_iec61158-4-21%7Bed1.0%7Den.pdf ↩

  5. ISO/IEC 8802-3: 2000 http://webstore.iec.ch/preview/info_isoiec8802-3%7Bed6.0%7Den.pdf ↩

  6. IEC 61158-4-21: 2010 http://webstore.iec.ch/preview/info_iec61158-4-21%7Bed1.0%7Den.pdf ↩

  7. IEC 61158-4-21: 2010 http://webstore.iec.ch/preview/info_iec61158-4-21%7Bed1.0%7Den.pdf ↩

  8. IEEE - Ether type https://standards-oui.ieee.org/ethertype/eth.txt ↩

  9. IEC 61158-4-21: 2010 http://webstore.iec.ch/preview/info_iec61158-4-21%7Bed1.0%7Den.pdf ↩

  10. IEC 61158-3-21: 2010 http://webstore.iec.ch/preview/info_iec61158-3-21%7Bed1.0%7Den.pdf ↩

  11. IEC 61158-4-21: 2010 http://webstore.iec.ch/preview/info_iec61158-4-21%7Bed1.0%7Den.pdf ↩

  12. IEC 61158-5-21: 2010 http://webstore.iec.ch/preview/info_iec61158-5-21%7Bed1.0%7Den.pdf ↩

  13. IEC 61158-6-21: 2010 http://webstore.iec.ch/preview/info_iec61158-6-21%7Bed1.0%7Den.pdf ↩

  14. IEC 61784-2: 2010 http://webstore.iec.ch/preview/info_iec61784-2%7Bed2.0%7Den.pdf ↩

  15. IEC 62439-7[permanent dead link] http://www.iec.ch/cgi-bin/restricted/getfile.pl/65C_656e_RVC.pdf?dir=65C&format=pdf&type=_RVC&file=656e.pdf ↩

  16. IEC 61784-5-17[permanent dead link] http://www.iec.ch/cgi-bin/restricted/getfile.pl/65C_641ea_CD.pdf?dir=65C&format=pdf&type=_CD&file=641ea.pdf ↩