What Are the Different Types of Digital Process Control?

An automatic control system that takes the parameters of the production process as controlled quantities to bring it close to a given value or keep it within a given range. Here, "process" refers to the process of the interaction and conversion of matter and energy in a production plant or equipment. The main parameters of the characterization process are temperature, pressure, flow rate, liquid level, composition, and concentration. Through the control of process parameters, the output of the product can be increased, the quality can be increased, and the energy consumption can be reduced during the production process. The general process control system usually adopts the form of feedback control, which is the main way of process control.

Process control system

(Terminology)

In the industrial production of petroleum, chemical industry, metallurgy, electric power, light industry and building materials, etc.

With the improvement of people's material living standards and the increasingly fierce market competition, the quality and functions of products have also developed to a higher level. The process of manufacturing products has become more and more complicated. Requirements for safe production and environmental protection, as

The world's first electronic digital computer came out in the United States in 1946. After more than ten years of research, the world's first process control computer (TRW) 300 was launched in the United States in 1959.

Classification of computer process control systems

The computer control system has a wide range of applications.The computer can control a single motor, valve, or the entire factory.The control method can be single-loop control or complex multi-variable.

Computer control system has been widely used in the field of process control with its unique advantages and powerful functions. At the same time, with the rapid development of computer software and hardware technology and communication technology, new control theories and new control methods are emerging. Looking into the future, its development trend has the following aspects.
(1) Vigorously promote and apply mature advanced technologies. Popular application of programmable logic controllers (PLCs) with intelligent I / O modules, powerful functions and high reliability. Intelligent regulators are widely used, and advanced network communications such as bitbus and fieldbus technologies New technology-based DCS and FCS control systems.
(2) Vigorously research and develop intelligent control systems. Intelligent control is a process that can autonomously drive intelligent machines to achieve their goals without human intervention. It is also another important area for using machines to simulate human intelligence. The types of intelligent control systems mainly include: hierarchical stepwise intelligent control systems, fuzzy control systems, expert control systems, learning control systems, artificial neural network control systems, and rules-based artificial intelligence control systems.
(3) Control and management are combined to develop towards Low Cost Automation (LCA). LCA is a type of automation system that realizes the main and key functions of conventional automation systems with modern technology, and has a lower investment. On the basis of DCS and FCS, advanced control strategies are adopted to take into account production process control tasks and enterprise management tasks together to form a computer integrated control system (CIPS), which can realize the development of low-cost integrated automation systems.
In short, due to the significant advantages of computer process control in terms of control, management functions, and economic benefits, it has been widely used in many industrial fields such as petroleum, chemical industry, metallurgy, aerospace, electric power, textiles, printing, medicine, and food. The computer control system will be further developed with the further development of computer software and hardware technology, control technology and communication technology, and will go deeper into the production departments.