A hierarchy framework on compositional verification for PLC software

The correctness verification of embedded control software has become an important research topic in embedded system field. The paper analyses the present situation on correctness verification of control software as well as the limitations of existing technologies. In order to the high reliability and high security requirements of control software, the paper proposes a hierarchical framework and architecture of control software (PLC program) verification. The framework combines the technologies of testing, model checking and theorem proving. The paper introduces the construction, flow and key elements of the architecture.