Author: Darvas, D.
Paper Title Page
THPHA159 What is Special About PLC Software Model Checking? 1781
  • D. Darvas, I. Majzik
    BUTE, Budapest, Hungary
  • E. Blanco Viñuela
    CERN, Geneva, Switzerland
  Model checking is a formal verification technique to check given properties of models, designs or programs with mathematical precision. Due to its high knowledge and resource demand, the use of model checking is restricted mainly to core parts of highly critical systems. However, we and many other authors have argued that automated model checking of PLC programs is feasible and beneficial in practice. In this paper we aim to explain why model checking is applicable to PLC programs even though its use for software in general is too difficult. We present an overview of the particularities of PLC programs which influence the feasibility and complexity of their model checking. Furthermore, we list the main challenges in this domain and the solutions proposed in previous works.  
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THPHA161 Applying Model Checking to Critical PLC Applications: An ITER Case Study 1792
  • B. Fernández Adiego, E. Blanco Viñuela, D. Darvas
    CERN, Geneva, Switzerland
  • B. Avinashkrishna, Y.C. Gaikwad, S. Sreekuttan
    Tata Consultancy Services, Pune, India
  • G.S. Lee
    Mobiis Co., Ltd., Seoul, Republic of Korea
  • R. Pedica
    Vitrociset s.p.a, Roma, Italy
  • I. Prieto Diaz
    IBERINCO, Madrid, Spain
  • Gy. Sallai
    BUTE, Budapest, Hungary
  The development of critical systems requires the application of verification techniques in order to guarantee that the requirements are met in the system. Standards like IEC 61508 provide guidelines and recommend the use of formal methods for that purpose. The ITER Interlock Control System has been designed to protect the tokamak and its auxiliary systems from failures of the components or incorrect machine operation. ITER has developed a method to assure that some critical operator commands have been correctly received and executed in the PLC (Programmable Logic Controller). The implementation of the method in a PLC program is a critical part of the interlock system. A methodology designed at CERN has been applied to verify this PLC program. The methodology is the result of 5 years of research in the applicability of model checking to PLC programs. A proof-of-concept tool called PLCverif implements this methodology. This paper presents the challenges and results of the ongoing collaboration between CERN and ITER on formal verification of critical PLC programs.  
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