| 摘要 |
PROBLEM TO BE SOLVED: To maintain the reliability in normal operation by ensuring the validity of a majority decision result, even if any one of digital processing circuits of normal systems is stopped when setting date is different in any one system of a plurality of digital processing circuits. SOLUTION: Digital processing circuits 12a, 12b and 12c are configured to have the same circuit parameter by giving the same setting value information thereto. When only one system has a different setting state, a majority decision processing circuit 13 compares each digital processing result Da, Db, Dc to determine an abnormal system, and rewrites the abnormal value to a value of final output information, thereby regularly maintaining the normal setting value. In each digital processing circuit, when the own processing result is differed from an output determined by the majority decision processing means, the own setting state is corrected so as to have the same setting state as the digital processing circuit of the output system determined by majority decision. COPYRIGHT: (C)2008,JPO&INPIT
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