Abstract:

This paper presents the main program, as well as some sub-programs, for a railway station microcomputer interlocking system, in block diagram form, representing the synthesis of safety, functional and logical demands based on one-channel operating principle of the existing relay systems, in accordance with the principle of modular software carrying out, recommended and applied in these systems. This program unites the necessary number of the type sub-programs, representing the recognizable functional wholes, with minimal number of program steps and minimal number of branches, enabling the easier safety, functional and logical analyses of the software, as well as of the whole system.