Huichuan PLC

Testing Modbus RTU Communication Between Siemens PLC 1200 and 1500

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Testing Modbus RTU Communication Between Siemens PLC 1200 and 1500

10.25-29 Chongqing Suzhou No Tin Siemens S7-1200/1500 PLC TIA Technology Practical Class Enrollment Open Modbus RTU Communication Discussion on Modbus RTU Communication In modern highly integrated industries, communication between PLCs is frequently used. Common communication protocols include Modbus, Profibus DP, Profinet, CANOPEN, etc. Today, we will explain how two PLCs communicate using Modbus RTU on … Read more

Schneider PLC Modbus IO Scanner Function: Easy MODBUS Communication Without Programming

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Schneider PLC Modbus IO Scanner Function: Easy MODBUS Communication Without Programming

MODBUS is a very common communication method, widely used in frequency converters, servos, instruments, and PLCs due to its free nature. Typically, PLCs act as the master station to read data from slave stations. However, the differences among various PLCs can make MODBUS programming quite complex, which can be confusing for beginners. Japanese PLCs usually … Read more

Learn to Use Modbus Communication Protocol

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Learn to Use Modbus Communication Protocol

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

Key Points of Modbus-RTU Communication with S7-1200 CM1241

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Key Points of Modbus-RTU Communication with S7-1200 CM1241

Recently, I used the S7-1200 to collect data from a certain flow sensor via Modbus-RTU. The Siemens side chose the CM1241 (RS422/485) (order number 6ES7 241-1CH32-0XB0, firmware version V2.2), and the CPU is 1214C with firmware version V4.2. I thought the debugging would be simple, but it took a lot of time, and I consulted … Read more

Modbus-RTU Communication Example with Siemens PLC

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Modbus-RTU Communication Example with Siemens PLC

WeChat Search Technical Training 01 Hardware Setup The Modbus communication in the program is conducted between the 0 communication ports of two S7-200 CPUs (it is best if each CPU has two communication ports). On the master side, communication can also be established using the corresponding library files “MBUS_CTRL_P1” and “MBUS_MSG_P1” through communication port 1. … Read more

Controlling Inverters with Siemens PLC via MODBUS

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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

Beginner’s Guide to TIA Portal: MODBUS-RTU Communication Configuration

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Beginner's Guide to TIA Portal: MODBUS-RTU Communication Configuration

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

Steps and Key Points for Modbus TCP Communication with Siemens PLC S7-200SMART

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Steps and Key Points for Modbus TCP Communication with Siemens PLC S7-200SMART

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

Introduction to Industrial Control Security: Modbus

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Introduction to Industrial Control Security: Modbus

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

Case Program | MODBUS TCP Communication in Open Communication

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Case Program | MODBUS TCP Communication in Open Communication

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