PURPOSE: A device for controlling a point machine is provided to reduce installation costs of the point machine by reducing the number of wires for controlling the point machine. CONSTITUTION: An interlock logic unit(100) includes control information of a point machine. A modem for a PLC(Power Line Communication) is connected to the interlock logic unit. The modem for the PLC modulates the control information of the point machine and transmits the modulated information to a router(400) for the PLC. The router for the PLC transmits the control information to the point machine through a power line(900) of a distribution board(220). The point machine switches the line by driving a motor based on the control information through the power line.
