DCS and its role in CIMS system

DCS is the abbreviation of Distributed Control System, which is commonly used in China as a distributed control system. It is a multi-level computer system composed of process control level and process monitoring level with communication network as the link. It integrates 4C technologies such as Computer, Communication (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 disperses the system control function on each computer, the system structure adopts a fault-tolerant design, so a computer failure will not cause the loss of other system functions. In addition, because the tasks undertaken by each computer in the system are relatively simple, a dedicated computer with a specific structure and software can be used for the function to be implemented, so that the reliability of each computer in the system is also improved.

(2) The open DCS adopts an open, standardized, modular and serial design. Each computer in the system uses a local area network to communicate to achieve information transmission. When it is necessary to change or expand the system function, the new computer can be easily connected Into the system communication network or off the network, almost does not affect the work of other computers in the system.

(3) Flexibility Configure software and hardware configuration according to different process application objects through the configuration software, that is, determine the measurement and control signals and the connection between each other, select the appropriate control law from the control algorithm library, and call the basic graphics from the graphics library The various monitoring and alarm screens required to easily form the required control system.

(4) It is easy to maintain a small or micro special computer with a single function, which has the characteristics of simple and convenient maintenance. When a certain part or a certain computer fails, it can be replaced online without affecting the operation of the entire system to quickly eliminate the fault .

(5) Coordination Various data are transmitted between the various workstations through the communication network. The entire system shares information and coordinates work to complete the overall function and optimization of the control system.

(6) Complete control functions and rich control algorithms, integrating continuous control, sequential control and batch control, can realize advanced control such as cascade, feedforward, decoupling, adaptive and predictive control, and can easily add the required Special control algorithm. The structure of DCS is very flexible. It can be composed of a dedicated management computer station, an operator station, an engineer station, a recording station, a field control station, and a data collection station. It can also be composed of a general-purpose server, industrial control computer, and programmable controller. The process control level at the bottom is generally implemented by scattered field control stations, data collection stations, etc., and is collected and controlled on-site, and transmitted to the production monitoring level computer through the data communication network. The production monitoring level performs centralized operation management on the data from the process control level, such as various optimization calculations, statistical reports, fault diagnosis, and display alarms. With the development of computer technology, DCS can connect with higher-performance computer equipment through the network as needed to achieve more advanced centralized management functions, such as planning and scheduling, warehouse management, and energy management.

Process industry CIMS is a complex and comprehensive automation system that deals with all production activities of the entire enterprise. As an effective tool and implementation method, DCS 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 and make the optimization decisions made by the CIMS system 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 perspective of 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 can also be completed on DCS.

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