METHOD AND UNIT FOR ONLINE MAINTENANCE OF CONTROL UNIT

PROBLEM TO BE SOLVED: To suppress a modification error of a control parameter when maintaining a plurality of control units constituting an asynchronous multiplexed system. SOLUTION: At the time of online maintenance of the control units, there performed are write processing (S1) to store the control parameter to a first control unit, preservation processing (S2) to preserve the control parameter being stored in the first control unit by the write processing, read processing (S3) to read the control parameter from the second control unit, detection processing (S4) to detect an unmodified parameter of the second control unit based on the comparison result of comparing the control parameter read from the second control unit by the read processing (S3) with the control parameter preserved by the control parameter preservation processing, and collective fitting processing (S5) to store the unmodified parameter into the second control unit. COPYRIGHT: (C)2009,JPO&INPIT