What is fieldbus? What is the historical background of the emergence of fieldbus?
Definition: A system that is applied in the production site to achieve bidirectional serial digital communication between microcomputerized measurement and control devices, also known as an open, digital, multipoint communication underlying control network. It is widely used in automation systems in manufacturing, process industries, buildings, transportation and other fields.
Background: A signal standard has been used from the 1950s to the present, that is, the analog signal standard of 4 one 2OmA. in the 1970s, digital computers were introduced to the measurement and control system, and at this time, the computers provided centralized control processing. in the 1980s, microprocessors were used in the field of control, and microprocessors were embedded in a variety of instruments and devices, forming the Distributed control system.
With the development and wide application of microprocessors, intelligent devices with IC instead of conventional electronic circuits and microprocessors as the core to implement the functions of information acquisition, display, processing, transmission and optimization control have been produced. Some of the expert-assisted analysis and decision-making capabilities of the digital intelligent instrumentation products, which itself has a sign such as automatic range conversion, automatic zero, self-calibration, self-diagnostics and other functions, but also provides fault diagnosis, historical information reports, status reports, trend charts and other functions of the development of communications technology, prompting the transmission of digital information network technology began to be widely used. At the same time, maintenance management based on quality analysis, test records of safety-related systems, and increased demand for environmental monitoring require instruments to be able to process information locally and allow it to be managed and accessed when necessary, and these have also led to a significant increase in the amount of communication between field instruments and higher-level control systems. In addition, from the point of view of practical applications, the control community has continued to make new demands in terms of control accuracy, operability, maintainability, portability, etc. This has led to the creation of field buses.
