| 摘要 |
PURPOSE:To increase the reliability of system, by recordng the same information duplicatedly on two sets of input and output units without lowering the efficiency of processing of software remarkably. CONSTITUTION:In storing the data from CPU2 duplicatedly on the input and output units 4 and 5, the write-in control section 5 writes in the data to the unit 4. Further, the readout control section 6 reads out the data written in at the end of write-in. Further, when the write-in to the buffer 7 is finished with the write-in control section, the content of the buffer 7 is read out and it is written in the input and output control unit 9. In this case, the write-in to the unit 4 can be regarded finished when the data write-in of data of the buffer 7 is finished. Thus, without remarkable lowering of the processing efficiency of software, the reliability of system can be increased through the duplicated recording of the same information to two sets of input and output units 4 and 9. |
