science

RAPIEnet

RAPIEnet is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand RAPIEnet rather than just read about it. In short: 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.

Key takeaways

RAPIEnet belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect RAPIEnet to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of RAPIEnet from memory before moving on to harder problems.

Reference excerpt

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)

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. 100 Mbit/s - 1 Gbit/s transmission speed, allowing electrical and optical media to be used together. Supports transmission modes such as Unicast, Multicast, and Broadcast. Supports "Store & Forward”and “Cut Through” switching.

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

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

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

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

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)

References

Illustrations

RAPIEnet: Figure 2. RAPIEnet Embedded dual port switch motion — Figure 2. RAPIEnet Embedded dual port switch motion

RAPIEnet: Figure 4. RAPIEnet chain topology — Figure 4. RAPIEnet chain topology

RAPIEnet: Figure 5. RAPIEnet ring topology — Figure 5. RAPIEnet ring topology

Worked examples

Example 1 — a first encounter with RAPIEnet

Start with the simplest possible case. Write down what RAPIEnet claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to RAPIEnet before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about RAPIEnet ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of RAPIEnet

In research: RAPIEnet appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses RAPIEnet in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: RAPIEnet is common in secondary-school and first-year university syllabi. It links to neighbouring topics Industrial Ethernet, so understanding it makes those chapters shorter.
In everyday life: Look for RAPIEnet outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “RAPIEnet” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study RAPIEnet in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what RAPIEnet means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain RAPIEnet out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is RAPIEnet in simple terms?

Why does RAPIEnet matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study RAPIEnet?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on RAPIEnet.