Abstract
Sequential function charts (SFCs for short) is a modeling language defined in the IEC 1131-3 standard that can be used to drive programmable logic controllers (PLCs). It includes interesting concepts like hierarchy and history variables. As the typical application area of this language is the control of industrial processes, it is obvious that a clear understanding of the semantics of these languages is of interest. It is also of interest for the programmers as well as for the builders of development environments based on this standard to know which semantic ambiguities the standard leaves open. This paper addresses these points providing a clear and formal semantic framework for SFCs that can be used, for instance, as a sound basis for building validation tools.
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References
Bonfatti, R, Monari, P., and Sampieri, U. (1999). IEC 1131-3 Programming Methodology. CJ International, Fontaine, France, first edition.
IEC (1998). Programmable Controllers-Programming Languages, IEC 61131-3. International Electrotechnical Commission, Technical Committee No. 65, second edition. Committee draft.
Lewis, R. (1998). Programming industrial control systems using IEC 1131-3, volume 50 of Control Engineering Series. The Institution of Electrical Engineers, Stevenage, United Kingdom, revised edition.
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Bornot, S., Huuck, R., Lakhnech, Y., Lukoschus, B. (2000). An Abstract Model for Sequential Function Charts. In: Boel, R., Stremersch, G. (eds) Discrete Event Systems. The Springer International Series in Engineering and Computer Science, vol 569. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-4493-7_26
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DOI: https://doi.org/10.1007/978-1-4615-4493-7_26
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