PROBLEM TO BE SOLVED: To make it possible to perform loading for a partial logic device among respective logic devices connected to LAN in a signal security system for railway.;SOLUTION: In a signal security system 1 for railway, pin-point loading for only a logic device 20, which is designated by a control device 10, among plural logic devices 20 connected to a same LAN 30 can be performed. That is, the control device 10 designates a loading object logic device and instructs transition into a data control mode to the device, and transmits program and data which are LD information after confirming that all object logic devices are transited into data control mode. Only the logic device 20, which is designated as an object logic device, receives transmitted program and data, and updates actual main program and data for execution of main processing concerning stored signal security.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT
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