9 Online Siemens TIA Portal PLC Training Camp Registration Open on August 7 Siemens PLC Practical Training Class in Qingdao on August 18 1. Overview of MODBUS Communication The MODBUS protocol is divided into two types: MODBUS protocol over serial links and MODBUS protocol based on TCP/IP. The serial link MODBUS protocol includes MODBUS ASCII … 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
Search on WeChat Technical Training Modbus TCP is a very traditional and widely used communication protocol, and many smart devices support this protocol. Siemens S7-200SMART and the 1200 and 1500 series support it for free (300 and 400 series incur high fees), and it has been made into a standard library, making it very convenient … Read more
The field of industrial control security is relatively closed, with few public resources available. I read “Hacking Exposed Industrial Control Systems,” a book from 2016, and selected some chapters for translation as a starting point. MODBUS Modbus is a serial communication protocol created in the late 1970s by Modicon (now Schneider Electric) for use with … Read more
Click the blue text above to follow us for more content Control Requirements: Use MODBUS TCP communication for data exchange between two PLCs 1. Read data from the server addresses 40001~40005 and store it in VW200~VW208; 2. Write data from VW210~VW218 into the server’s 40006~40010; 3. Write data from VB220 into 00001~00008. 1. Open 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
PLC Communication Protocol In modern industrial control systems, PLC is widely used. Programs can be easily modified and managed, thereby improving production efficiency, saving time and costs. The communication protocol of PLC is the communication support protocol for connecting different operating systems and hardware architectures. In simple terms, PLC usually controls the underlying layer, collects … 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
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