The Modbus RTU communication protocol uses a master-slave response method for data communication. Requests can only be initiated by the master (PC, HMI, etc.) through a unique slave address, and the slave (terminal device) responds to the master’s requests, thus enabling half-duplex communication. This protocol only allows the master to initiate requests, and the slave … Read more
1. Introduction The HMI (Human-Machine Interface) is increasingly used in industrial automation systems and devices due to its small size, high performance, and strong real-time capabilities. It features various displays such as letters, Chinese characters, graphics, and images, with a simple and user-friendly interface. Equipped with long-lasting membrane button keyboards, it is easy to operate. … Read more
Before we start this topic, we should understand a commonly confused issue. The difference between RS485 and MODBUS: RS485 is a physical interface, simply put, it is hardware. MODBUS is an internationally standardized communication protocol used for data exchange between devices from different manufacturers (generally for industrial purposes); the so-called protocol can also be understood … Read more
Imagine a DC power supply with an output socket that has three pins: positive, negative, and ground. Correspondingly, the load’s plug should also have three pins that match the power supply side, allowing for correct energy supply. Note that there are three essential conditions to meet: The first is that the shape, size, and pin … Read more
Search on WeChat Technical Training This article will introduce the detailed steps for Modbus communication between the S7-1200 PLC and the V20 frequency converter. 1. Find an S7-1200 PLC with an RS485 communication module and a V20 frequency converter. 2. Connect the RS485 module to the V20 frequency converter. The wiring method is to connect … Read more
1. Overview of MODBUS Communication The MODBUS protocol consists of MODBUS protocol over serial links and MODBUS protocol based on TCP/IP. The serial link MODBUS protocol includes MODBUS ASCII (string) and MODBUS RTU. The MODBUS protocol library provided by 200SMART supports MODBUS RTU communication. MODBUS RTU sends data in hexadecimal values. MODBUS ASCII sends data … Read more
Modbus Simulation – Essential Skills for Beginners In the field of industrial automation, we often encounter various communication protocols, such as Profibus, ControlNet, Ethernet, Canopen, and Modbus. Among these, the Modbus protocol is the most widely used, free, and open-source, and is supported by almost all manufacturers’ industrial equipment. When working on engineering projects, we … Read more
Modbus Introduction A brand new, customizable Modbus. This is a version you have never seen before. Easy to port and easy to use, with plenty of comments that you will love. The Modbus protocol is the standard communication protocol for industrial control devices, details can be found in the encyclopedia description. Simply put, the Modbus … Read more
Search on WeChat Technical Training In actual industrial automation applications, various communications are essential, such as PN communication, S7 communication, MODBUS TCP communication, and MODBUS communication, among others; however, the most widely used is MODBUS communication, as it is an open, free, and universal communication protocol. Often, during equipment debugging on the industrial site, communication … Read more
Introduction In 1979, Schneider Electric established the Modbus protocol, a bus protocol for industrial sites. Today, many industrial applications using RS485 communication adopt the Modbus protocol. So today we will learn about RS485 communication and the Modbus communication protocol. 1 Preface In fields such as industrial control, power communication, and intelligent instrumentation, serial communication is … Read more