Basic principle of fieldbus - Solutions - Huaqiang Electronic Network

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Fieldbus is the combination of 3C (Computer, Communication, Control) technology development, and the intersection of process control technology, automation instrumentation technology and computer network technology development. It is the concentrated expression of the development of information technology and network technology in the control field. It is the inevitable result of the extension of information technology and network technology to the scene.

According to the International Electrotechnical Commission (IEC) standard and the Fieldbus Foundation (FF), the fieldbus is a digital, bidirectional, multi-branch communication network that connects intelligent field devices and automation systems. Fieldbus technology places dedicated microprocessors into traditional measurement and control instruments, enabling them to have digital computing and digital communication capabilities, making them a network node that can perform certain inspection, control, and communication tasks independently. A network system in which a plurality of measurement control instruments, computers, etc. are connected as nodes through a common twisted pair cable; using a public and standardized communication protocol, between a plurality of microcomputerized measurement and control devices located at a production control site, and on-site instrumentation and use Data transmission and information sharing are realized between remote computers for monitoring and management, and various automatic control systems adapted to actual needs are formed.

Fieldbus is mainly oriented to process control. In addition to transmitting direct information of digital and analog signals, it can also transmit control information. The data unit exchanged by the network is a frame. Compared with the Distributed Control System (dcs), the Fieldbus Control System (FCS) has high reliability and better security, interchangeability and interoperability, openness, dispersion, etc. advantage.

In summary, the fieldbus is a real-time control communication network that interconnects the lowest-level field controller and field smart meter devices. It follows all or part of the communication protocol of the ISO/OSI open system interconnection reference model.