RAPIEnet

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RAPIEnet
RAPIEnet 로고.png
Protocol Information
Type of Network Open Real-time Ethernet
Physical Layer IEEE 802.3, Ethertype 0x88fe
Network Topology Ring or Line topology
Device Addressing DIP switch or hardware/software
Network Configuration Automatically done by protocol

RAPIEnet (Real-time Automation Protocols for Industrial Ethernet) is Korea's first Ethernet international standard for real-time data transmission.

  • An Ethernet-based industrial networking protocol [1] developed in-house by LSIS guarantees real-time transmission and is registered as an international standard.[2] (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)
  • 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.[1]
  • With 100Mbit/s/1Gbit/s transmission speed, electrical and optical media can be used together.[1][3]
  • Supports "Store & Forward”and “Cut Through” switching.[1]

Acquired Standards[edit]

International Standards[edit]

  • IEC 61158-3-21: 2010, Industrial communication networks - Fieldbus specifications - Part 3-21: Data-link layer service definition - Type 21 elements.[4]
  • IEC 61158-4-21: 2010, Industrial communication networks - Fieldbus specifications - Part 4-21: Data-link layer protocol specification - Type 21 elements.[1]
  • IEC 61158-5-21: 2010, Industrial communication networks - Fieldbus specifications - Part 5-21: Application layer service definition - Type 21 elements.[5]
  • IEC 61158-6-21: 2010, Industrial communication networks - Fieldbus specifications - Part 6-21: Application layer protocol specification - Type 21 elements.[6]
  • IEC 61784-2: 2010, Industrial communication networks - Profiles - Part 2: Additional fieldbus profiles for real-time networks based on ISO/IEC 8802-3.[7]
  • IEC 62439-7, Industrial communication networks - High availability automation networks - Part 7: Ring-based Redundancy Protocol (RRP) [8]

RAPIEnet Technology[edit]

Protocol Stack Structure[edit]

Figure 1. RAPIEnet Protocol Stack Structure


Embedded dual port switch motion[edit]

Figure 2. RAPIEnet 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[edit]

Figure 3. ISO/IEC 8802.3 RAPIEnet based RAPIEnet frame format


  • RAPIEnet Ether type: 0x88FE[9]

Topology[edit]

Figure 4. RAPIEnet chain topology


Figure 5. RAPIEnet ring topology


Recovery System[edit]

  • With an embedded switch and full-duplex, it has dual link routes and communication fault tolerance, enabling fast recovery capabilities.
- Recovery time < 10 ms[1]


Figure 6. RAPIEnet recovery system in a ring topology


  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[edit]

Figure 7. RAPIEnet 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[edit]

Figure 8. System diagram using RAPIEnet


Others[edit]

Other international standards in process[edit]

  • 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)[10]

References[edit]

  1. ^ a b c d e f g IEC 61158-4-21: 2010
  2. ^ RAPIEnet related articles
  3. ^ ISO/IEC 8802-3: 2000
  4. ^ IEC 61158-3-21: 2010
  5. ^ IEC 61158-5-21: 2010
  6. ^ IEC 61158-6-21: 2010
  7. ^ IEC 61784-2: 2010
  8. ^ IEC 62439-7
  9. ^ IEEE - Ether type
  10. ^ IEC 61784-5-17