The invention orbit circuit for identifying the train occupancy information of the magnetic closed interval; Receive passes sinhohyeon when information corresponding to the train occupancy information of the front closed section, the control relay portion and said front closed section to be transmitted to the rear occlusion period to sinhohyeon when information corresponding to the train occupancy information in the self-closed interval sent from the track circuit and communication that are respectively connected to the rear occlusion section and the double-speed, so that the pass sinhohyeon upon information received from sinhohyeon when the information is the control relay portion so that the or pass the control relay unit received from the front closed section rearward closed interval conversion It consists contain added.
According to the present invention, so as to reliably transmit a forward signal manifestation information and track occupancy information of the automatic occlusion device by improving a method of transferring data by the optical communication interface redundancy in the rail of the relay-based automatic occlusion device trains to failure decreases to improve the efficiency, and there is an effect that it the operating status information of the automatic occlusion device can check the operation change of the field device and transmits it to the station unit by the field devices to improve the maintainability of the preventive maintenance.