Joint debugging of fieldbus control system
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Field bus control systems are known as the fifth generation of control systems, and they represent the future direction for the development of control systems. Some newly built oil refining and chemical processing plants in China now utilize field bus control systems; those who are familiar with these systems could please explain the applications of field bus instruments as well as the methods for their integration.
In fact, fieldbus instruments simply bring the intelligent module to the field; they transmit digital signals rather than 4–20mA signals. They carry more information, and it is possible to zero, adjust, and set the range of these instruments from the control room.
The fieldbus control system consists of three parts: the measurement system, the control system, and the management system. The hardware and software of the communication part are its most distinctive features. The fieldbus system FCS is referred to as the fifth generation of control systems. Generally, pneumatic signal control systems PCS from before the 1950s are considered the first generation, electric analog signal control systems such as those using 4–20mA signals are regarded as the second generation, centralized digital computer control systems are classified as the third generation, while distributed control systems DCS that have emerged since the mid-1970s are considered the fourth generation. As a next-generation control system, the Field Bus Control System FCS, on the one hand, overcomes the limitation of DSC systems that rely on dedicated communication networks by adopting open and standardized solutions, thereby eliminating the drawbacks associated with closed systems ； On the other hand, the distributed control system architecture that combines centralization and decentralization in DCS has been transformed into a new fully distributed structure, with control functions completely delegated to the field. It can be said that openness, decentralization, and digital communication are the most prominent features of fieldbus systems!
The fieldbus instrument I have come across is the 848T, but it is used in few places
The FF bus has been used in DeltaV control systems; for example, a pressure gauge connected to the bus allows engineers to see not only the pressure level but also the temperature of the medium in contact with the gauge as well as the temperature of its casing. There is no concept of range – as long as the values do not exceed the maximum range, it’s possible to carry out debugging on the engineer station. After configuring the units and the desired channels, the setup can be installed in the controller