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Its development and application of DCS-DCS, Distributed Control Systems - Electrical industry by weqfwer rgetfg





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Its development and application of DCS-DCS, Distributed Control Systems - Electrical industry by
Article Posted: 02/25/2011
Article Views: 73
Articles Written: 1394
Word Count: 624
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Its development and application of DCS-DCS, Distributed Control Systems - Electrical industry


 
Business,Business News,Business Opportunities
Is a computer technology, control technology, network technology and CRT display technology as one of the high-tech products, with the controlling function, easy operation and high reliability, can be easily used for industrial equipment production control and management, in the chemical , electric power, metallurgy and other areas of process automation applications have been very popular. The past 20 years, as microelectronics and computer technology and the rapid development of industrial automation requirements gradually increase, DCS gone through several stages of development, the structure is getting more sophisticated technology is more mature, has become an indispensable controlled automation equipment . Especially the 90's, DCS hardware specifications widely used in more advanced high-grade industrial PC, and some have even adopted the RISC workstation, software, the introduction of a common commercial packages, the system of international standards regarding interconnection of the common network, step by step to the direction of information integration.

Structure DCS Although gone through several stages of development, but its hardware structure is always retained centralized management (including the operating station, engineer station and PC), monitor network traffic control and three parts, and in order to achieve decentralized control and central management capabilities as the goal. Surveillance control station consists of three functional areas:

* Site testing of analog, digital and pulse volume of input and output, and conversion processing; * All kinds of control loop operation (adjustment circuit, logic operations, etc.); * Control operation results of the direct output. Engineer will be responsible for system management, control configuration, the system generates and downloading. Operator Station is a man-machine interface, by the microprocessor, CRT monitor, keyboard and printer, etc., used in the production process control operations, process status display, alarm status display and real-time data and historical data printing. PC management of production scheduling, optimization, production and management and decision-making levels of management and computing. Network Communication part of the station is responsible for various functions of data communication and liaison between the. DCS network is gradually opening up. DCS manufacturers have also adopted common standards for networks to facilitate connections between different manufacturers products and communications.

Development 1. Control diverse DCS at the lowest level for the monitor controller (some call site control unit), usually with dozens of operational control algorithm and Other Some numbers and logic functions, such as arithmetic, logical operation, feedforward, PID control, adaptive control and lag time of compensation, some of them, including sequential control, interlock protection and alarm functions. Targets for the different requirements of different processes, to organically combine these functions to meet the requirements of the production system. This integrated feature of the configuration and system-generated methods for complex chemical reactor and the large combined unit more to demonstrate its superiority, especially with the fast loop, fast and complex interlocking requirements associated with the absolute security of complex control, DCS is essential, and often need to increase by DCS PLC Joint control device.

2. Easy to operate Operator station is a strong function of man-machine interface. Early DCS systems using dedicated input / output devices, due to lower production volume, not just the high cost and technological progress more slowly, are relatively simple functions. Today, DCS extensive use of common monitor, keyboard, or even a complete general-purpose computer. Process through the CRT display objects can be integrated centralized monitoring. Keyboard can be realized through a variety of operating functions. Printer can print a variety of timely data and reporting needs.

If RISC workstation as the operating station, the operator will feel more convenient and more handy.

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