Particular attention is devoted to the possibility of reconfiguring the logic of these devices, using programmable logic integrated circuits The technical difficulties in the problems which today stand in the way of using relay protection and automation systems are indicated and a new technology for solving these problems is presented. The advantages of choosing programmable logic integrated circuits to obtain adaptive technological algorithms in power system protection and control systems are pointed out. One of the most promising forms of developing the apparatus part of relay protection and automation devices is considered. Relay Protection and Automation Systems Based on Programmable Logic Integrated Circuits Evaluation of the results showed them to be equivalent to those obtained by well qualified designers. The effectiveness of the method with 150 rules was verified by its experimental application to some logic conversions in a real power plant design. Rules in the latter class use layout conditions to predict intersections among layout objects without their coordinates being fixed. In the generation of detailed logic schematics, knowledge is used as rules for deriving various kinds of layout conditions on schematics, and rules for generating two-dimensional coordinates of layout objects. Furthermore, the knowledge is expressed in terms of two classes of rules one for generating a hypothesis of individual synthesis operations and the other for considering several hypotheses to determine the connection ordering of elements to be added. The search order of the groups is given by upper-level knowledge. In logic synthesis, for building up complex synthesis procedures by combining generally-described knowledge, knowledge is applied by groups. The method uses connection data of function elements in the functional description diagram as input, and synthesizes a detailed logic structure by adding elements to the given connection data incrementally, and to generate detailed logic schematics. Wada, Yutaka Kobayashi, Yasuhiro Miyo, Tsunemasa Okano, Masato.Īn automated method is proposed for logic conversion from functional description diagrams to detailed logic schematics by incorporating expertise knowledge in plant controller systems design. (author)Īutomated logic conversion method for plant controller systems
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A considerable time would be required to design, test and commission the assembly and once it is in full working order any desired modification, even of minor nature, could require major hardware changes. This assembly would be cumbersome with a power consumption of 30-40VA. This assembly could comprise 60-80 relays, some counter/timers and a great deal of wiring. To illustrate the advantage of using a PLC over a traditional relay logic system, consider a control system with 20 input/output points. Due to the simplicity of entering and modifying the programmed instructions to suit the requirements of the process under control, the PLC is truly a versatile and flexible device that can be employed easily and efficiently to repeatedly control tasks that vary in nature and complexes.
As the structure of the PLC is based on the same principles as those employed in computer architecture, it is capable of performance not only relay switching tasks, but also other applications such as counting, calculating, comparing and the processing of analogue signals. Initially the PLC was used to replace relay logic, but is ever-increasing range of functions means that it is found in many and more complex applications. It now not only replaces the earlier relay logic controls but also has taken over many additional control functions.
In the world of automation the Programmable Logic Controller (PLC) has became for control. International Nuclear Information System (INIS) Integrated plant automation using programmable logic controllers
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