DCS and its role in the CIMS system - Database & Sql Blog Articles

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Dcs is the abbreviation of Distributed Control System. It is commonly used in China as a distributed control system. It is a multi-level computer system composed of a process control level and a process monitoring level, which is a communication network. It integrates 4C technologies such as Computer, Communication, Display (CRT) and Control (Control). The basic idea is decentralized control, centralized operation, hierarchical management, flexible configuration, and convenient configuration.
DCS has the following characteristics:
(1) High reliability Because DCS distributes system control functions on various computers, the system structure adopts fault-tolerant design, so failure of one computer will not cause loss of other functions of the system. In addition, since the tasks undertaken by the computers in the system are relatively simple, a dedicated computer having a specific structure and software can be used for the functions to be implemented, so that the reliability of each computer in the system is also improved.
(2) The open DCS adopts open, standardized, modular and serialized design. Each computer in the system uses LAN to communicate and realize information transmission. When it is necessary to change or expand the system function, the newly added computer can be easily connected. Entering or removing from the system communication network hardly affects the work of other computers in the system.
(3) Flexibility The software and hardware configuration is performed according to different process application objects through the configuration software, that is, the measurement and control signals and the mutual connection relationship are determined, the applicable control law is selected from the control algorithm library, and the basic graphics are called from the graphics library. A variety of monitoring and alarm screens are required to conveniently construct the required control system.
(4) It is easy to maintain a single-function small or micro-dedicated computer with simple and convenient maintenance. When a certain part or a certain computer fails, it can be replaced online without affecting the operation of the whole system, and quickly eliminate the fault. .
(5) Coordination Each workstation transmits various data through the communication network, and the entire system information is shared and coordinated to complete the overall function and optimization of the control system.
(6) Control function complete control algorithm is rich, integrating continuous control, sequence control and batch control, which can realize advanced control such as cascade, feedforward, decoupling, adaptive and predictive control, and can be easily added Special control algorithm. The DCS is very flexible and can be composed of a dedicated management computer station, an operator station, an engineering station, a recording station, a field control station, and a data acquisition station. It can also be composed of a general-purpose server, an industrial control computer, and a programmable controller. The process control level at the bottom layer generally implements data acquisition and control on-site by distributed field control stations, data acquisition stations, etc., and transmits them to the production monitoring level computer through the data communication network. The production monitoring level performs centralized operation management on data from the process control level, such as various optimization calculations, statistical reports, fault diagnosis, and display of alarms. With the development of computer technology, DCS can achieve more advanced centralized management functions such as scheduling, warehouse management, and energy management by connecting to higher-performance computer equipment as needed.
Process Industry CIMS is a complex integrated automation system, which deals with the entire production activities of the entire enterprise. DCS is an effective tool and means of implementation. It completes important basic control and real-time production data collection and dynamics in process industry CIMS. Monitoring and other functions. Compared with management computers, DCS can provide more reliable production process data, making the optimization decisions made by CIMS systems more reliable.
From a functional point of view, the production automation system, dynamic monitoring system and online quality control in the process industry CIMS can be realized by DCS. From the hierarchical structure of process industry CIMS, DCS is mainly responsible for process control and process optimization tasks, and some production scheduling and production management tasks can also be completed on DCS.