Construction of CFC-Programs by LTL-Specification
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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 behaviour 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. It was previously shown how ST-, LD- and 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. PLC-program representation on CFC within the approach to programming by LTLspecification differs from other representations. It gives the visualization of a data flow from inputs to outputs. The influence and dependence among variables is explicitly shown during the program execution within one PLC working cycle. In fact, CFC-program is a scheme of PLC-program data flow.
Keywordsprogrammable logic controllers (PLC) construction and verification of PLC-programs LTL-specification CFC-diagrams
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- 4.Kuzmin, E.V., Sokolov, V.A., and Ryabukhin, D.A., Construction and verification of PLC LD-programs by LTL-specification, Model. Anal. Inf. Sist., 2013, vol. 20, no. 6, pp. 78–94.Google Scholar
- 6.Kuzmin, E.V. and Sokolov, V.A., Modeling, specification and construction of PLC-programs, Model. Anal. Inf. Sist., 2013, vol. 20, no. 2, pp. 104–120.Google Scholar
- 9.CoDeSys, Controller Development System. http://www.3s-software.com/.Google Scholar
- 14.SMV, The Cadence SMV Model Checker. http://www.kenmcmil.com/smv.html.Google Scholar
- 15.Wardana, A., Development of Automatic Program Verification for Continuous Function Chart based on Model Checking, Kassel University Press GmbH, 2009.Google Scholar
- 16.Ovataman, T., Aral, A., Polat, D., and Unver, A.O., An overview of model checking practices on verification of PLC software, in Software and Systems Modeling, 2014.Google Scholar
- 17.Pakonen, A., Matasniemi, T., Lahtinen, J., and Karhela, T., A toolset for model checking of PLC software, Proceedings of 18th IEEE International Conference on Emerging Technologies and Factory Automation, ETFA2013, Cagliari, 2013.Google Scholar
- 18.Parr, E.A., Programmable Controllers. An Engineer’s Guide, Newnes, 2003.Google Scholar
- 19.Petrov, I.V., Programmiruemye kontrollery. Standartnye yazyki i priemy prikladnogo proektirovaniya (Programmable Controllers. Standard Languages and Techniques for Applied Design), Moscow: SOLON-Press, 2004.Google Scholar