Abstract
One of the main obstacles of using formal verification for complex PLC (Programmable Logic Controller) programs is the lack of formal requirements. There are no widely used specification methods that could serve as input for formal verification; also that could help the developers to capture the behaviour and handle the complexity of these programs. The goal of this research is to bring formal specification closer to the PLC domain in order to help the development, verification and maintenance. This paper aims to briefly overview the particularities of the PLC domain and the state of the art in formal specification. Then it collects the requirements towards a PLC-specific formal specification language based on general works, comparative case studies and own experiences at CERN. Also, it draws up a sketch of a possible specification method that follows the collected requirements.
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