The Modbus protocol​ is widely used in the field of industrial automation. Its main derivative forms are Modbus RTU (Remote Terminal Unit) and Modbus TCP (Transmission Control Protocol), which are used for serial bus and Ethernet transmission respectively. Although they both belong to the Modbus family, there are significant differences in the physical layer, data encapsulation, communication reliability, etc.

Modbus is a widely used communication protocol​ in industrial automation and control systems. It was originally developed by Modicon (now Schneider Electric) in 1979 to enable communication between programmable logic controllers (PLCs).

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With the development of IoT, more and more devices need to be remotely monitored and managed through the network. In the fields of industrial automation, energy management, smart buildings, etc., Modbus protocol, as a stable and widely used communication protocol, is widely used for data exchange between devices. In order to connect these Modbus devices with modern network infrastructure, Modbus gateway has become a key bridge. In this article, we will explore in detail the different modes of Modbus gateway and their differences in IoT applications.

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With the continuous improvement of industrial automation, the importance of industrial bus technology has become increasingly prominent. As one of the core technologies in the industrial field, the industrial bus plays an important role in achieving efficient communication and data exchange between devices.

The Modbus protocol has become an important bridge connecting different devices and systems in the industrial field due to its profound technical background and wide application scenarios. This article will briefly describe several key technologies and core elements in the Modbus protocol, including function codes, address allocation, data models, and security considerations, to provide readers with a comprehensive and in-depth understanding.

This case mainly explains the Modbus RTU parameter configuration connection routine of the serial IO series device (this time as a slave device) and the Siemens PLC S7-200smart (hereinafter referred to as Siemens PLC, this time as the host device). This case takes the serial IO series​ MA01-AACX2220 as an example.

With the continuous development of industrial automation and Internet of Things technology, the Modbus protocol is becoming more and more popular as a communication protocol. Among many communication protocols, why is Modbus so popular?

Modbus RTU and Modbus TCP are the two main variants of the Modbus protocol. Traditionally, Modbus RTU (the RTU required to transmit information back to a Modbus master or SCADA HMI) has been used by many different types of devices.