RAPIEnet
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 transmission modes such as Unicast, Multicast and Broadcast.^[1]
• Supports "Store & Forward”and “Cut Through” switching.^[1]

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

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: 0x88FE^[9]

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]

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

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]