| 摘要 |
PURPOSE:To guarantee the propriety of retrial in any case, by executing sequentially retrial in the preset retrial unit, based on the function check mode set with a retrial mode setting circuit. CONSTITUTION:A retrial control circuit 14, a retrial mode control circuit 15 and a save circuit 17 and the like are provided. When a retrial timing circuit 19 in the circuit 15 indicates the timing of the 1st to the final step of each machine instruction, a retrial processing routine start signal 111 is generated at each machine instruction and the processing is performed while the retrial of each machine instruction is repeated. When a check point is selected to a point of time during the flow of processing, the processing is interrupted forcedly before the check point of the next point of time is selected, the saved data is restored and the processing is retried from the check point. When the check point of the next point of time is selected, the processing is repeated similarly and the retrial unit is retried once without fail. |
