Geodesic
Modeling, Specification and Construction of PLC-programs
Modelirovanie i analiz informacionnyh sistem, Tome 20 (2013) no. 2, pp. 104-120

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A new approach to construction of reliable discrete PLC-programs with timers — programming based on specification and verification — is proposed. Timers are modelled in a discrete way. For the specification of a program behavior we use the linear-time temporal logic LTL. Programming is carried out in the ST-language according to a LTL-specification. A new approach to programming of PLC is shown by an example. The proposed programming approach provides an ability of a correctness analysis of PLC-programs using the model checking method. The programming requires fulfillment of the following two conditions: 1) a value of each variable should be changed not more than once per one full PLC-program implementation (per one full working cycle of PLC); 2) a value of each variable should only be changed in one place of a PLC-program. Under the proposed approach the change of the value of each program variable is described by a pair of LTL-formulas. The first LTL-formula describes situations that increase the value of the corresponding variable, the second LTL-formula specifies conditions leading to a decrease of the variable value. The LTL-formulas (used for specification of the corresponding variable behavior) are constructive in the sense that they construct the PLC-program, which satisfies temporal properties expressed by these formulas. Thus, the programming of PLC is reduced to the construction of LTL-specification of the behavior of each program variable.
Keywords: programmable pogic controllers, software engineering, modeling and specification of PLC-programs. 
@article{MAIS_2013_20_2_a7,
     author = {E. V. Kuzmin and V. A. Sokolov},
     title = {Modeling, {Specification} and {Construction} of {PLC-programs}},
     journal = {Modelirovanie i analiz informacionnyh sistem},
     pages = {104--120},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAIS_2013_20_2_a7/}
}
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E. V. Kuzmin; V. A. Sokolov. Modeling, Specification and Construction of PLC-programs. Modelirovanie i analiz informacionnyh sistem, Tome 20 (2013) no. 2, pp. 104-120. http://geodesic.mathdoc.fr/item/MAIS_2013_20_2_a7/