Secure Decentralized Control of Railway Crossings

This paper demonstrates the use of model checking based veriication technology to establish safety critical properties for a railway control application. The veriication technology is tightly integrated with the Statemate r system of i-Logix Inc., USA. Key features of this technology are the powerful debugging capabilities and graphical entry for safety critical properties. This paper gives an overview over the veriication environment and also highlights the design methodology that provides its base. In order to further enhance the veriication environment we add Message Sequence Charts (MSC) to the existing tool-set. We show that MSCs can be eeectively used in the requirements analysis phase of the design process. As a sample application serves a railway control system.