集散型计算机控制系统

Distribution control system

一、A brief introduction of the distributed control system

Distributed control system, also called distributed control system, is a new computer control system for centralized control system. It is a centralized decentralized control system based on multi processor based, is currently in process control, especially in large and medium-sized production device to control the application of the most and the highest reliability control system. In the traditional process control introduction of computer technology, using software composed of various functional modules, instead of the past conventional instrument function, to realize the control of production process of pressure, temperature, liquid level, flow, composition and mechanical quantities such as parameters, and the screen of CRT display, communication applications linked network technology component system. The features of DCS field control station of distributed control, real-time data transmission through the cable sent to the control room operator station, realize the centralized monitoring and management, decentralized control, the control function, load and risk diversification.

Distributed control system of information management is "set", "scattered" is to control function, DCS system can realize decentralized control and centralized monitoring and management can be realized. In the aspect of system function, DCS and centralized control systems are not very different, but in the realization of system functions methods are completely different. Centralized control system only needs a computer and the I / O devices and CRT, keyboard, printer, etc. peripheral equipment can be complete system functionality and DCS would normally have to by the four basic parts: the system network, I / O control station, operator station and engineer station. In DCS, the field I/O control station, operator station and engineer station is composed of independent computers, respectively, to complete data acquisition and control; monitoring, alarm and recording; system configuration, system management and other functions. These specific features of the computer are referred to as "nodes", and all of these nodes and through network system connected together, become a complete and unified system, in order to achieve decentralized control and centralized monitoring, centralized operation. DCS system is with the modern large-scale industrial production automation continued to rise and process control requirements of increasingly complex emerges as the times require comprehensive control system, it is the product of computer technology, system control technology, network communication technology and multimedia technology combined, can provide window friendly interface and powerful communication function. Is a sophisticated equipment to complete process control and management.

二、The history of the development of distributed control system

DCS since its inception in 1975, has experienced thirty years of development. In thirty years, although DCS has not been a major change in the structure of the