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PLC-automata: A new class of implementable real-time automata. (English) Zbl 0954.68085
Summary: We introduce PLC-automata as a new class of automata which are tailored to deal with real-time properties of Programmable Logic Controllers (PLCs). These devices are often used in industrial practice to solve controlling problems. Nevertheless, PLC-automata are not restricted to PLCs, but can be seen as a model for all polling systems. A semantics in an appropriate real-time temporal logic (duration calculus) is given and an implementation schema that fits the semantics is presented in a programming language for PLCs. A case study is used to demonstrate the suitability of this approach. We define several parallel composition operators, and present an alternative semantics in terms of timed automata for which model-checkers are available.

##### MSC:
 68Q45 Formal languages and automata
##### Keywords:
real time; specification; formal methods; duration calculus; PLC
Kronos; Uppaal
Full Text:
##### References:
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