What is Modbus and How does it Work? | Summary and Q&A

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December 3, 2018
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RealPars
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What is Modbus and How does it Work?

TL;DR

Modbus is the oldest and most widely used automation protocol for process automation, allowing devices to communicate and integrate seamlessly with each other.

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Key Insights

  • 🥶 Modbus is the oldest and most popular automation protocol in process automation and SCADA systems.
  • 💦 It enables integration of devices from different manufacturers, making it a valuable skill for electrical technicians and engineers working in the field.
  • ❓ The Modbus organization manages the development and update of Modbus protocols.
  • 🔉 Modbus supports various physical media, such as serial communication (RS-232, RS-485, RS-422) and Ethernet.
  • 💁 Modbus messages can be sent in plain form over dedicated networks or embedded in Ethernet packets for more versatile network systems.
  • 😥 The main message structure of Modbus is peer-to-peer, supporting both point-to-point and multi-drop networks.
  • 🛟 Modbus communication follows a master/slave client-server technique, where only the master initiates transactions.

Transcript

in the real world of device-to-device process automation communication a dialogue or conversation between devices occurs systematically in many cases over different types of communication networks and in different languages depending on the process automation equipment manufacturer a very specific or proprietary language is used or it may be a lang... Read More

Questions & Answers

Q: What is Modbus and why is it important in the field of process automation?

Modbus is a communication protocol that enables devices and equipment to communicate and integrate in process automation systems. It provides a common language for devices, allowing seamless data exchange and control.

Q: What are the advantages of using Modbus in process automation?

Using Modbus allows for integration of devices from different manufacturers, creating a wider choice for users. It is supported by multiple manufacturers, software vendors, and service organizations. Additionally, it has active community groups for support and the ability to add capabilities in the future.

Q: What are the different types of Modbus communication?

The different types of Modbus communication include Modbus RTU (serial communication), Modbus ASCII (similar to RTU but using ASCII encoding), Modbus TCP (used over Ethernet), and Modbus Plus (used for high-speed, large-scale systems).

Q: How does Modbus communication work between devices?

Modbus communication follows a master/slave architecture, where one device (master) initiates transactions called queries, and other devices (slaves) respond by supplying data or taking requested actions. Slaves do not initiate messages on their own and only respond to queries transmitted from the master.

Summary & Key Takeaways

  • Modbus is the go-to communication protocol in the field of process automation and SCADA systems, enabling seamless communication between different devices and equipment.

  • It provides a common language for devices to exchange information, allowing data acquisition and control.

  • Modbus has different versions for serial port and Ethernet communication, such as Modbus RTU, Modbus ASCII, Modbus TCP, and Modbus Plus.

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