Abstract
The article extends the cycle of papers dedicated to programming and verificatoin of PLC-programs by LTL-specification. This approach provides the availability of correctness analysis of PLC-programs by the model checking method. The model checking method application presupposes constructing a finite model of a PLC-program. For successful verification of the required properties it is important to take into consideration that not all combinations of input signals from the sensors can occur while PLC is working with a control object. This fact requires more advertence to the construction of the PLC-program model. In this paper we propose to describe a consistent behavior of sensors by three groups of LTL-formulas. They will affect the program model, approximating it to the actual behavior of the PLC-program. The idea of LTL-requirements is shown by an example. A PLC-program is a description of reactions on input signals from sensors, switches and buttons. In constructing a PLC-program model, the approach to modeling a consistent behavior of PLC sensors allows to focus on modeling precisely these reactions without an extension of the program model by additional structures for design of the realistic behavior of sensors. The consistent behavior of sensors is taken into account only at the stage of checking the conformity of the programming model to required properties, i.e. a property satisfaction proof for the constructed model occurs with the condition that the model contains only such executions of the program that comply with the consistent behavior of sensors.
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Kuzmin, E.V., Ryabukhin, D.A. & Sokolov, V.A. Modeling a consistent behavior of PLC-sensors. Aut. Control Comp. Sci. 48, 602–614 (2014). https://doi.org/10.3103/S0146411614070256
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DOI: https://doi.org/10.3103/S0146411614070256