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Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

ISO Journal TitleJ Korean Inst. IIIum. Electr. Install. Eng.
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Title Improvement of Memory Efficiency for Alternative Sequence in Process Control System Described by SFC
Authors Jeong-Bong You
DOI http://dx.doi.org/10.5207/JIEIE.2010.24.5.055
Page pp.55-61
ISSN 1225-1135
Keywords Control System ; PLC ; LD ; SFC ; Memory Efficiency
Abstract When we design the control system used Programmable Logic Controller(PLC) by Sequential Function Chart(SFC), if we use a SFC, it is easy to know the sequential flow of control, to maintenance the controller and to describe a program. We program a SFC by a unique sequence , an alternative sequence and a parallel sequence. If we program a SFC by a alternative sequence, the memory size of a alternative sequence must be larger than the memory size of a unique sequence. Therefore this thesis show an efficient method to reduce a memory size and we confirmed its feasibility through actual example.