CANopen is a communication protocol based on CAN that has been widely used in the industrial field. CAN provides reliable low-level data transmission, while CANopen offers a standardized application layer protocol. In the CANopen protocol, each CANopen device has an object dictionary. The CANopen device model is shown in the figure below. The object dictionary … Read more
Industrial 4.0 Bus – Profibus What is Profibus? [PROFIBUS] PROFIBUS is a fieldbus standard used in automation technology, promoted in 1987 by Siemens and fourteen other companies along with five research institutes. PROFIBUS stands for PROcess FIeld BUS. PROFIBUS and PROFINET, which is used in industrial Ethernet, are two different communication protocols. PROFIBUS is an … Read more
From “Old Antique” to Intelligent System: A Record of the Transformation of the S7-400 Rolling Mill Control System in the Metallurgical Industry Do you remember the urgent call I received three years ago? “Engineer Li, the No. 3 rolling mill has stopped again, the old system just can’t hold up anymore!” At that time, I … Read more
PROFIBUS: Siemens PLC Distributed Control System Architecture for Building Scalable Automation Platforms unsetunsetIntroductionunsetunset In the field of industrial automation, an efficient and reliable communication network is the foundation for building intelligent production systems. PROFIBUS, as a standard fieldbus protocol launched by Siemens, has become an important link connecting various devices and control systems. This article … Read more
1. Introduction to PROFINET and PROFIBUS PROFINET and PROFIBUS are two fieldbuses launched by the PNO organization, first implemented by Siemens. The two are not comparable; PROFINET is based on industrial Ethernet, while PROFIBUS is based on RS485 serial bus. Due to the different media, the protocols of the two are completely different and have … Read more
Follow us | Discover more exciting content Alright, I will write this technical article about PLC communication protocols as “Pig Brother”. Hello everyone, today we will talk about the “nervous system” of industrial automation – PLC communication protocols. In the industrial field, data transmission between devices is as important as the human nervous system. This … Read more
For more exciting content, click to follow “PLC Enthusiasts” The Siemens S7-1200 can communicate via Modbus RTU through communication modules, with the PLC serving as the controller, typically acting as the Modbus master. When functioning as a Modbus master, it generally polls parameters from multiple slave devices. This article introduces the timed polling program for … Read more
Click 👆 above to follow Engineer Yan Ji and ★star★. Protocol Definition 1. Modbus is a request-response protocol implemented using a master-slave relationship. 2. The Modbus protocol introduces different application data units to change the packet format used in serial communication or to allow the use of TCP/IP and User Datagram Protocol (UDP) networks. Its … Read more
Click on the top “Technical Training” to select “Pinned Public Account” Over 110,000 industrial control professionals follow this WeChat platform: Technical sharing, learning exchange, industrial control videos Recently, many students have been asking about the MODBUS communication of the S7-200 series PLC, so today I will write an article to discuss how to use the … Read more
1. Design Philosophy of Modbus Protocol Modbus devices communicate using a master-slave (client-server) architecture, where only one device (the master/client) can initiate transactions (referred to as queries). Other devices (slave/server) respond by providing requested data or performing operations as requested in the query. Slaves are any peripheral devices (I/O converters, valves, network drives, or other … Read more