| 摘要 |
PROBLEM TO BE SOLVED: To configure an inexpensive system by parallel operating a plurality of computers while guaranteeing the security of a computer control system without a majority decision. SOLUTION: Store data to affect hazard are collected into a hazard control table 1 and in such an internal structure, in addition to ordinary data, the redundant data of a pattern not to naturally occur by hardware abnormality are stored as well. The write to the table and the confirmation of the write are performed by an operator (human being) 8 and only read from the hazard control table 1 is performed by a computer program. Therefore, even when there is data abnormality caused by hardware abnormality in the case of confirmation due to the operator, such abnormality can be surely detected. Thus, normal data can be recovered by updating a control cycle. COPYRIGHT: (C)2003,JPO
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