FIELD

The present invention relates to a terminal device for communicating with a central device in a train information management system, the central device, the train information management system, and a train information management method.

BACKGROUND

In a train information management system, central devices are mounted on a leading car and a last car of a train and transmit command information to terminal devices mounted on intermediate cars of the train. Some train information management systems include two systems. In the train information management system including the two systems, two central devices are mounted on a single car, and one of the central devices is operated as a main system, that is, a central device with a higher priority. Patent Literature 1 discloses a technique for exchanging an excitation signal between two central devices and for determining whether the other central device is normal or abnormal.

CITATION LIST

Patent Literature

Patent Literature 1: Japanese Patent No. 4966888

SUMMARY

Technical Problem

However, according to the conventional technique, in a case where the central device with the higher priority is reset and restarted due to time-up of a watchdog timer and the like, there is a possibility that a setting content is initialized and the central device transmits command information to which management information is not set, that is, including invalid management information to a train. Therefore, there has been a problem in that, even though a terminal device which has received the command information including the invalid management information holds normal management information based on command information received in the past, the held management information is updated, that is, initialized, and a normal train operation cannot be continued.

The present invention has been made in consideration of the above, and an object of the present invention is to obtain a terminal device capable of continuing a normal train operation even in a case where there is a central device that transmits command information including invalid management information.

Solution to Problem

To solve the above problems and to achieve the object, the present invention is a terminal device which receives command information from a central device in a train information management system. The terminal device includes a transmission-reception unit which transmits and receives command information to and from the central device or other terminal device and periodically receives command information from a plurality of central devices. Furthermore, the terminal device includes a control unit which determines whether or not management information as information on a train composition set by a central device as a transmission source regarding the received command information, is normal command information. The control unit also determines command information to be adopted based on a priority set to the central device as the transmission source in a case where the normal command information has been received from the plurality of central devices. The terminal device includes a storage unit which stores information on the priorities set to the plurality of central devices.

Advantageous Effects of Invention

According to the present invention, an effect can be obtained such that, even in a case where there is a central device which transmits command information including invalid management information, a terminal device can continue a normal train operation.

