摘要 |
PROBLEM TO BE SOLVED: To simply and inexpensively update firmware from a personal computer to a packaged PLC with no main power supplied thereto. SOLUTION: When updating firmware of a PLC 2 via communication cables 5, 6 connected to each communication port of the PLC 2 from a personal computer 1 while no main power cannot be supplied to the PLC 2 or turned on, auxiliary power output to a communication port of the personal computer 1 is supplied to the communication port of the PLC 1 via the communication cables 5, 6, to use the auxiliary power for updating the firmware of the PLC via the communication cables. COPYRIGHT: (C)2010,JPO&INPIT
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