A few days ago, I saw discussions in my technical group about the topic of “TTL, RS232, and RS485 transmission distances“. Today, I took some time to share relevant content. Overview Many readers might not know what TTL, RS232, and RS485 are, so this section provides a brief overview of them. 1. TTL Level TTL: … Read more
Follow the IoT Planet to track the latest developments in the Internet of Things! “IoT Planet” focuses on sharing technologies and applications related to the Internet of Things. In the Internet of Things, communication lines are used to transmit data, signals, and power to establish communication links between devices. Common communication lines include USB cables, … Read more
Communication Requirements and Functions: The firmware version of V90 is V1.05 and above; V90 communicates through the RS485 interface at the top of the drive’s front panel (no additional hardware required); Pin assignment of RS485; (Pin 3 and Pin 8) Parameters can be modified, such as speed/position/torque set values via ModBus; Parameters can be monitored, … Read more
Modbus Communication Protocol History Initially, factories controlled systems through what was known as large microprocessor systems in “Distributed Control Systems” or “DCS”. A central control system managed the entire setup (in the control room). All sensors and actuators were connected to the control system via point-to-point wiring. Alternatively, they could be added in a network … Read more
Hello everyone, good evening! Beginner’s Guide to TIA Portal: MODBUS-RTU Communication Configuration Continuing from the previous article, we will explain how to use MODBUS communication commands. MODBUS communication requires three commands: ① MB_COMM_LOAD command ② MB_MASTER command (Master command) ③ MB_SLAVE command (Slave command) The communication commands are located in Communication – Communication Processor – … Read more
Click Jicheng Training WeChat Follow me! ☀ Jicheng Training Network’s official WeChat is the most professional and concentrated in the industrial control field, providing technical sharing, free videos, and a communication platform. Follow Jicheng, and there will be no problem in improving your skills! 1. Overview All the content that needs to be discussed regarding … 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