Computer Control System (CCS) is a system that uses computers to participate in control and connects with controlled objects with the help of some auxiliary components to achieve certain control purposes.
What are the classifications of computer control system structures
Data acquisition system(recommended learning:PHP video tutorial)
In this application, the computer is only responsible for data collection and processing, but does not directly participate in control. It performs patrol inspection, processing, recording and over-limit alarm of various process variables in the production process. It also conducts cumulative analysis and real-time analysis of these variables to obtain various trend analysis and provide reference for operators.
Direct digital control system
The computer performs operations according to the control rules, and then passes the results through the output channel to the controlled object, so that the controlled variable meets the requirements performance indicators. The difference from the analog system is that in the analog system, the signal transmission does not need to be digitized; while the digital system must first undergo analog-to-digital conversion, and the output control signal must also undergo digital-to-analog conversion before the actuator can be driven. Because computers have strong computing power, it is easy to change the control algorithm.
Since the computer directly undertakes the control task, it requires good real-time performance, high reliability and strong adaptability.
Supervision computer control system
This system performs optimization analysis and calculation based on the working conditions of the production process and the established mathematical model, generates the optimal setting value, and sends it to Implemented by direct digital control system. The supervisory computer system undertakes advanced control and management tasks, requires strong data processing capabilities, large storage capacity, etc., and generally uses higher-end microcomputers.
Distributed Control System (DCS)
The distributed control system is based on a microprocessor and uses decentralized control functions, centralized display operations, and takes into account separate, autonomous and comprehensive Coordinated design principles for a new generation of instrumentation and control systems. Distributed control system, referred to as DCS, can also be literally translated as "distributed control system" or "distributed computer control system".
It adopts the basic design ideas of decentralized control, centralized operation and management, and adopts a multi-layer hierarchical, cooperative and autonomous structure. Its main features are its centralized management and decentralized control. At present, DCS has been widely used in various industries such as electric power, metallurgy, and petrochemicals.
Fieldbus control system
, also known as FCS, is a new generation of distributed control system. This system improves the weaknesses of DCS systems such as high cost and inconsistent product communication standards of various manufacturers, resulting in inability to interconnect.
In recent years, due to the development of fieldbus, intelligent sensors and actuators have also developed in the direction of digitalization, replacing 4-20mA analog signals with digital signals, laying the foundation for the application of fieldbus. Fieldbus is a fully digital, bidirectional, multi-site serial communication network connecting industrial field instruments and control devices. Fieldbus is called the industrial control network standard in the 21st century.
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