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Study on Expansion of Output Point for PLC Output Unit  

You Jeong-Bong (Division of Electrical & Electronics Eng, Kongju National University)
Jeon Ho-Ik (Dept. of Computer Eng, Hyejeon College)
Nam Sang-Yep (Dept. of Information & Communication Eng, Kyungmoon College)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.42, no.3, 2005 , pp. 25-32 More about this Journal
Abstract
PLC is the most widely utilized among many sorts of existing controller for the design of process control system, and study about a PLC language is performed actively. In this paper, we proposed the method that we increase an output points when increased of the output machine which is going to control it in the FA design that used PLC. Output point is going to be extended with 2-3 points in the state that cannot equip output unit in basic base any more. Then an extension base, a power supply, an extension cable and an output unit must be equipped particularly. Then a cost must be added very much. This paper propose the method which extended an output in a small quantity. We designed the expansion unit that received the points of output unit and decoded the signal and the program module that finally extended output points by encoding and decoding, and we confirmed his feasibility through a experiment.
Keywords
PLC; Ladder diagram; Expansion module; Output unit; Decoder;
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