What is a fieldbus?
What is a fieldbus?
Definition: A system applied to the production site to realize bidirectional serial digital communication between microcomputerized measurement and control devices, also known as an open, digital, multi-point 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 in use from the 1950s to the present, which is the analog signal standard of 4 to 2OmA. 1970s, digital computers were attracted to the measurement and control system, and at this time the computer provided centralized control processing. 1980s, microprocessors were used in the control field, and microprocessors were embedded in various instruments and equipment, forming a Distributed control system.
With the development and wide application of microprocessors, intelligent devices with ICs instead of conventional electronic circuits and microprocessors as the core, implementing functions such as information acquisition, display, processing, transmission and optimal control, were produced. Some digital intelligent instrument products with expert-assisted inferential analysis and decision-making capabilities, which itself has functions such as automatic a sign is range conversion, automatic zeroing, self-correction, self-diagnosis, etc., and can also provide fault diagnosis, historical information reports, status reports, trend graphs and other functions The development of communication technology has led to the transmission of digital information network technology began to be widely used. At the same time, the increase in demand for maintenance management based on quality analysis, test records for safety-related systems, and environmental monitoring, all of which require instruments to be able to process information locally and allow for management and access when necessary, has also led to a significant increase in communication between field instruments and higher-level control systems. In addition, from the perspective of practical applications, the control community is constantly putting forward new demands in terms of control accuracy, operability, maintainability, portability, etc. This has led to the creation of fieldbuses.
