Imagine a DC power supply with an output socket interface that has three pins: positive, negative, and ground. Correspondingly, the load’s plug should also have three pins that correspond one-to-one with the power supply side to correctly obtain power supply. Note that there are three essential conditions that must be met: The first is that … Read more
Search on WeChat Technical Training In 1979, Schneider Electric established the Modbus protocol, a bus protocol used for industrial sites. Many industrial applications using RS485 communication adopt the Modbus protocol, so today we will explore RS485 communication and the Modbus communication protocol. 【1】/ Introduction In industrial control, power communication, and intelligent instruments, serial communication is … Read more
Search WeChat Technical Training Imagine a DC power supply with three pins on its output socket: positive, negative, and ground. Correspondingly, the load’s plug should also have three pins that correspond to the power supply, allowing it to receive the energy supply correctly. Note that there are three essential conditions: The first is that the … Read more
The TIA V13 SP1 software provides two versions of Modbus RTU commands: Figure 1. Two Versions of Modbus RTU Commands The earlier version of the Modbus RTU command (MODBUS (V2.2) in Figure 1) can only communicate via the CM1241 communication module or the CB1241 communication board. The new version of the Modbus RTU command (MODBUS(RTU) … Read more
RS485 and MODBUS communication are commonly used concepts in industrial control systems, but they are different. Below is a brief introduction. RS485 is a physical interface, simply put, it is hardware. MODBUS is an internationally standardized communication protocol used for device data exchange between different manufacturers (generally for industrial purposes); in industrial environments, data is … 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
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
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
Search on WeChat Technical Training 1. What is MODBUS? 1. Basic Concepts MODBUS is a communication protocol initially advocated by MODICON (now a brand of Schneider Electric). It has gradually been recognized as a standard communication protocol through practical applications by most companies. As long as data communication or transmission follows this protocol, different systems … Read more