Software Design of Electronic Interlocking System Based on Real-Time Object-Oriented Modeling Technique

Abstract

Electronic interlocking systems using micro-computer are developed to overcome the problems of conventional relay interlocking systems and to minimize the cost and the maintenance requirements when the system needs to be rebuilt or expanded.[1] However, it is very difficult to diagnose the root cause in case of a single device problem since there are multiple causes. Therefore, guaranteeing the stability to a equivalent level to relay interlocking systems is the main requirement for electronic interlocking systems to be benefit. This can be accomplished by a careful design of both the hardware and software and their interface. The stability of the interlocking software is determined by not only its reliability and efficiency of interlocking implementation but also by the convenience of maintenance. The method of real-time system development and (the) method of conventional data have an error of the confidential side, error detecting and error recovery, problem of exception situation processing, reusability of software of process and maintenance aspect and so on. The method for supplement shortcoming of these methods is real-time software development methodologies of object center. These methodologies play important role in solving complexity system, maintaining and requiring increased problems of software quantity as applying to object intention concept. But, because these methods are putting emphasis on analysis than design method, which are quitting emphasis on object structure among the analyses, development of real-time software has lacking aspects. A design approach for developing interlocking software to improve the problems of existing systems was proposed in this paper. A design and modeling strategy based on the Real-time Object-Oriented Modeling (ROOM)[2] procedure, which is the most appropriate approach in the initial stage of real-time software development, is proposed. Although it is an object-oriented method, it is a top-down design method that is similar to the structural analysis method based on the ROOM that is effective for real-time problems; therefore, it is not only convenient for standardization, expansion, and maintenance but also can contribute to improved reliability and stability of the electronic interlocking system.