RAPIEnet
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 transmission modes such as Unicast, Multicast and Broadcast.[1]
- Supports "Store & Forward”and “Cut Through” switching.[1]
RAPIEnet | |
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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 |
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.[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
Protocol Stack Structure
![](../I/m/RAPIEnet_%ED%94%84%EB%A1%9C%ED%86%A0%EC%BD%9C_%EA%B5%AC%EC%A1%B0.png)
Figure 1. RAPIEnet Protocol Stack Structure
Embedded dual port switch motion
![](../I/m/%EB%82%B4%EC%9E%A5_%EB%93%80%EC%96%BC_%ED%8F%AC%ED%8A%B8_%EC%8A%A4%EC%9C%84%EC%B9%98_%EB%8F%99%EC%9E%91.png)
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
![](../I/m/RAPIEnet_%ED%94%84%EB%A0%88%EC%9E%84_%ED%8F%AC%EB%A7%B7.png)
Figure 3. ISO/IEC 8802.3 RAPIEnet based RAPIEnet frame format
- RAPIEnet Ether type: 0x88FE[9]
Topology
![](../I/m/%EC%84%A0%ED%98%95_%ED%86%A0%ED%8F%B4%EB%A1%9C%EC%A7%80.png)
Figure 4. RAPIEnet chain topology
![](../I/m/%EB%A7%81%ED%98%95_%ED%86%A0%ED%8F%B4%EB%A1%9C%EC%A7%80.png)
Figure 5. RAPIEnet ring 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 ms[1]
![](../I/m/%EB%A7%81%ED%98%95%EC%97%90%EC%84%9C%EC%9D%98_%EB%B3%B5%EA%B5%AC.png)
Figure 6. RAPIEnet recovery system in a ring topology
- Transmits signal from Device 1 to Device 3.
- A fault occurs between Device 2 and Device 3.
- Notify the fault from Device 2 to Device 1.
- Transmits signal back from Device 1 to Device 3.
Flexible Hybrid Structure
![](../I/m/%EA%B5%AC%EB%A6%AC%EC%84%A0%EA%B3%BC_%EA%B4%91%EC%84%A0%ED%98%BC%ED%95%A91.png)
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
![](../I/m/RAPIEnet%EC%9D%84_%EC%9D%B4%EC%9A%A9%ED%95%9C_%EC%8B%9C%EC%8A%A4%ED%85%9C%EA%B5%AC%EC%84%B1%EB%8F%84.png)
Figure 8. System diagram using RAPIEnet
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)[10]
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References
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