Formation of signals at linear dispatch centralization points

The article examines modern approaches to improving dispatcher centralization (DC) systems through the use of programmable logic controllers (PLCs). An analysis is presented of the structure and functioning of the line station (LS), which incorporates channels for telecontrol (TC), telesignaling (TS), and synchronization (SC). Particular attention is paid to enhancing the reliability of transmitted data by applying cyclic redundancy codes (CRC). The study demonstrates the potential of modeling the states of controlled objects using automata theory, in particular the Moore automaton, which allows for improved predictability of system output characteristics and greater control reliability. Using the Siemens SIMATIC S7-1200 PLC in the TIA Portal environment, fragments of DC logic were implemented in the Ladder Diagram (LD) language. The obtained results demonstrate the effectiveness of applying PLCs in railway automation and confirm the prospects for further integration of intelligent diagnostic algorithms aimed at enhancing train traffic safety. This article presents a comprehensive study of the dispatcher centralization (DC) system, which serves as a key element in ensuring the safety and efficiency of train traffic management on modern railways. The primary focus is on the processes of forming and analyzing discrete signals at line stations (LS), which originate from electrical interlocking (EI) objects such as switches and signals. The study provides a detailed discussion of signal processing algorithms, as well as methods for detecting and diagnosing potential malfunctions - such as false track occupancy or loss of object control - that may lead to operational disruptions. To enhance the reliability and accuracy of object state monitoring, a model based on automata theory, namely the Moore automaton, is proposed. This model enables the formalization and prediction of system behavior under different states, taking into account temporal sequences of signal transitions. To ensure the integrity and reliability of transmitted data between the central and line stations, the use of a noise-resistant cyclic redundancy code (CRC-8) is proposed. The practical part of the research includes the development and simulation of program logic in the Ladder Diagram language within the TIA Portal environment, using the Siemens SIMATIC S7-1200 PLC certified for railway applications. Structural and functional diagrams of the system, state transition tables of the automaton, and signal timing charts are provided. The results are aimed at improving the fault tolerance and uninterrupted functioning of dispatcher centralization systems, which constitutes a key factor in the advancement of future intelligent transport systems.