![]() 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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