Abstract
Railway transportation system is a critical sector where design methods and techniques are defined by international standards in order to reduce possible risks to an acceptable minimum level. CENELEC 50128 strongly recommends the utilization of finite state machines during system modelling stage and formal proof methods during the verification and testing stages of control algorithms. Due to the high importance of interlocking table at the design state of a signalization system, the modelling and verification of interlocking tables are examined in this work. For this purpose, abstract state machines are used as a modelling tool. The developed models have been performed in a generalized structure such that the model control can be done automatically for the interlocking systems. In this study, NuSMV is used at the verification state. Also, the consistency of the developed models has been supervised through fault injection. The developed models and software components are applied on a real railway station operated by Metro Istanbul Co.
Highlights
The importance of railway transportation is increasing day by day as the world becomes more populated
Winter formed a model through abstract state machines (ASM) (Abstract State Machine) notation which is a similar language to Robinson and state-transition diagrams
Distinct from the other studies carried out, a general modelling structure concerning the general properties of station topology and interlocking table has been formed in this study
Summary
The importance of railway transportation is increasing day by day as the world becomes more populated. Certification stage of a railway signalization project generally includes this specific application part because general application part has been already certified for one time only. Winter formed a model through ASM (Abstract State Machine) notation which is a similar language to Robinson and state-transition diagrams. She performed the model check through NuSMV [6]. Distinct from the other studies carried out, a general modelling structure concerning the general properties of station topology and interlocking table has been formed in this study. Conversion systematic has been revealed so that the ASM model of the interlocking table can be used with NuSMV software.
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