Validation of a communication standard between detectors and telecontrol systems in the railway enviroment
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The railway environment relies over several detection systems to provide a secure trans- portation; some of these devices are the lateral wind detector, fallen object detectors, weather stations, vertical impacts detector, among many others. Each device provides particular functionalities and claims its own communication requirements. Given the complexity of a telecontrol system, a homogeneous communication solution supposes an improvement tool in terms of eficiency and future growth of the network, allowing connection capability with open systems, supplier independence and reducing installation and maintenance costs. This project includes a classification of the detection systems in the railway environ- ment to be aware of their complexity, in addition, issues related to remote systems and transport SCADA protocols are summarized. Further on the study, some general concepts related to this project's scenario must be described to comprehend the communication between detection and control systems and provide a standard solution for the communication of the current detection systems in the railway environment. Once analyzed the requirements, the solution that better suites characteristics such as standardization, interoperability, scalability and extensibility is the IEC 60870-5-104 communication standard. To adapt this technology to the railway control environment a data model specification was developed to integrate each particular detection protocol and facilitates the development of the implementation to validate the communication between the local operation points and the technical buildings. The addressing architecture is described to take advantage of the protocol's bene- fits, considering the necessary modifications in the control centres equipment according to each addressing plan; also the database model created to adapt the information from each detector studied previously to the desired standard will be described and finally the applications developed as test model to validate the specification of the selected standard for its use in railways detection systems are explained.