libmodbus

M-Bus Multi-Master to Modbus RS232 (RS485) – ADFWEB Converter – Guangzhou Xinyu IoT

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M-Bus Multi-Master to Modbus RS232 (RS485) - ADFWEB Converter - Guangzhou Xinyu IoT

M-Bus Multi-Master to Modbus RS232 (RS485) – ADFWEB Converter – Guangzhou Xinyu IoT Author: Zou Wuyi Mobile 185-020-77899Email: [email protected] 1 Product Features: HD67063-232-B2-xxx / HD67063-485-B2-xxx is a gateway device that supports Modbus slave and M-Bus master/slave communication. It has the following features: Electrical isolation between RS232C/RS485 and M-Bus ; Baud rate and parity can be … Read more

When Modbus Meets TCP/IP

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When Modbus Meets TCP/IP

Hello everyone, today we are going to discuss a topic that is both frustrating and rewarding in the industrial field—how to make the “old gentleman” Modbus and the “modern youth” TCP/IP shake hands and make peace. Last year, while debugging a sewage treatment plant project, I encountered a “generation gap” issue between these two protocols, … Read more

Implementation of Interconnectivity Technology in PLC Intelligent Manufacturing System Function Block Programming

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Implementation of Interconnectivity Technology in PLC Intelligent Manufacturing System Function Block Programming

Click the blue text to follow! Old Li Talks About PLC Function Block Programming: Making Devices “Understand Each Other” A few days ago, Xiao Wang asked me: “Old Li, why can’t our new Siemens PLC connect with that Japanese Mitsubishi one? I followed the manual, but it seems like the devices can’t ‘understand’ each other.” … Read more

J1939 to Modbus Master – ADFweb Gateway Converter – Guangzhou Xinyu IoT

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J1939 to Modbus Master - ADFweb Gateway Converter - Guangzhou Xinyu IoT

J1939 to Modbus Master – ADFweb Gateway Converter– Guangzhou Xinyu IoT Author: Zou Wuyi [email protected] 1、Product Features: Configurable J1939 to Modbus master gateway supports the following functions: Baud rate can be changed via software; Electrical isolation between the two buses; Can read data requested by the gateway from J1939 frames to Modbus devices; Power supply … Read more

Efficient Design of Modbus Communication Programs

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Efficient Design of Modbus Communication Programs

1. Introduction Modbus communication is a widely used communication protocol, commonly applied in variable frequency drives, smart instruments, and other intelligent devices. This article uses the S7-200SMART series PLC as the Modbus master and the Siemens V20 variable frequency drive and Omron E5EZ intelligent temperature controller as slaves to share how to use a custom … Read more

Siemens S7-1200: A Guide to Building an IoT Gateway

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Siemens S7-1200: A Guide to Building an IoT Gateway

Practical Sharing: How I Built the Siemens S7-1200 IoT Gateway Hello, old friends! Hello everyone, I am Engineer Wang, and I have been engaged in automation and IoT integration for over ten years. Today, I would like to share with you a project experience I recently completed—how to build a reliable IoT gateway using the … Read more

In the Ethernet Era, Modbus Still Thrives!!!

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In the Ethernet Era, Modbus Still Thrives!!!

As a classic communication protocol in industrial automation, Modbus has been widely used globally since its inception in 1979. From the initial serial communication to today’s high-speed Ethernet links, Modbus has undergone technological evolution and expansion, marking a milestone in the field of industrial communication. The Origin of the Protocol: The Beginning of Serial Communication … Read more

In-Depth Explanation of Modbus Communication: A Case Study of S7-200 SMART and Energy Meter Integration

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In-Depth Explanation of Modbus Communication: A Case Study of S7-200 SMART and Energy Meter Integration

Connecting a PLC to an energy meter? It sounds quite sophisticated, but it’s similar to connecting a Bluetooth headset to a phone; it’s just two devices communicating with each other. Modbus is the “language” they use to chat, which simply means sending and receiving data in a specific format. The S7-200 SMART is a compact … Read more

When RS485 Meets WiFi: Lessons Learned from Industrial IoT Gateway Transformation

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When RS485 Meets WiFi: Lessons Learned from Industrial IoT Gateway Transformation

unsetunsetIntroductionunsetunset Last week, I encountered a real project failure where Old Zhang’s robotic arm suddenly started dancing, and the PLC data could not be transmitted to the cloud. Today, let’s discuss how to use a $20 ESP32 module to handle both PLC’s RS485 communication and cloud data integration. No need for high-end gateways; follow me … Read more

FX5U: Beginner’s Guide to Mitsubishi PLC and Practical Modbus Communication

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FX5U: Beginner's Guide to Mitsubishi PLC and Practical Modbus Communication

FX5U: Beginner’s Guide to Mitsubishi PLC and Practical Modbus Communication Imagine you have just taken over an automation renovation project, with five frequency converters standing like silent soldiers waiting for orders. An operator points to the flashing screen in the control room and asks, “Can the data from these devices be displayed in real-time?” Don’t … Read more