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http://dx.doi.org/10.5207/JIEIE.2005.19.3.127

Improved Implementation of Interlock Using Management Step Described by SFC  

You, Jeong-Bong (공주대학교 전기전자공학부)
Publication Information
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers / v.19, no.3, 2005 , pp. 127-133 More about this Journal
Abstract
Programmable Logic Controller(PLC) is the most widely utilized and plays an important role in industrial control system. The study about a PLC language is performed actively. Ladder Diagram(ID) is the most widely used in PLC. In is not suitable for describing a complex sequential logic and is very difficult to grasp the sequential flow of control logic and has the disadvantage for a maintenance. On the other hand, Sequential Function Chart(SFC) is very easy to grasp the sequential flow of control logic and has the compatability for a maintenance but has the disadvantage for describing a condition and a interlock logic. In this paper, we propose the method that describe the interlock logic using management step, and confirm his feasibility through a actual examples.
Keywords
PLC; Ladder diagram; SFC; Interlock; Management Step;
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