| 摘要 |
PROBLEM TO BE SOLVED: To protect a program used for a control apparatus comprising an FA system over a network. SOLUTION: The FA system 10 includes an encryption conversion unit 100; a programmable logic controller (PLC) 130; and equipment 140. The encryption conversion unit 100 and PLC 130 are connected to the Internet 150. The encryption conversion unit 100 encrypts a control program run by the PLC 130 and transmits the encrypted program to the PLC 130. The PLC 130, receiving the encrypted program, checks whether the received program is unique to the equipment 140, decodes the control program from the program according to an encryption rule previously generated by the encryption conversion unit 100 if it is the unique program, and controls the equipment by running the control program. COPYRIGHT: (C)2008,JPO&INPIT
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