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Construction of CFC-programs by LTL-specification

By D. A. Ryabukhin, E. V. Kuzmin and V. A. Sokolov

Abstract

<p class="p1"><span class="s1">This article continues a cycle of papers, which describe an approach to construction and verification of discrete PLC-programs by an LTL-specification. The approach provides a possibility of PLC-program correctness analysis by the model checking method. For the specification of the program behavior the linear-time temporal logic LTL is used. The correctness analysis of an LTL specification is performed automatically by the symbolic model checking tool Cadence SMV. </span></p><p class="p1"><span class="s1">Previously it was shown how ST-, LDand IL-programs are constructed by a correct (with verified program properties) LTL-specification. In this article a technology of CFC-program construction by an LTL-specification is described. The language CFC (Continuous Function Chart) is a variation of FBD (Function Block Diagram). FBD is a graphical language for microcircuits. CFC provides a possibility of free allocation of program components and connections on a screen. The approach to construction of CFC-programs is shown by an example. </span></p><p class="p1"><span class="s1">PLC-program representation on CFC within the approach to programming by LTL-specification differs from other representations. It gives the visualisation of a data flow from inputs to outputs. Influence and dependence between variables is explicitly shown during program execution within one PLC working cycle. In fact, CFC-program is a scheme of PLC-program data flow.</span></p

Topics: программируемые логические контроллеры (ПЛК), построение и верификация ПЛК-программ, LTL-спецификация, CFC-диаграммы, Information technology, T58.5-58.64
Publisher: Yaroslavl State University
Year: 2016
OAI identifier: oai:doaj.org/article:ba78421a0a3d40beb46b6778fbb4e9a4
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