| 摘要 |
PURPOSE:To prevent a data flow from being lacked or delayed by allowing a switching part included in an operation part to switch a driving system input part to a waiting system input device at the time of occurrence of abnormality in the driving system input part, and at the time of occurrence of abnormality in a driving system output part, allowing a switching part included in an output part to switch the driving system output part to a waiting system output part. CONSTITUTION:When abnormality is caused in the driving system input part 5, the abnormality is detected by an input data abnormality detecting means included in the operation part 1 and the driving system input part 5 causing the abnormality is switched to the waiting system input part 6 by the switching part 11 included in the operation part 1. When abnormality is caused in the driving system output part 2, the abnormality is detected by using an output data abnormality detecting means included in the output part 2 and the driving system output part 2 causing the abnormality is switched to the waiting system output part 3 by the switching parts 21, 31 included in the output parts 2, 3. Thus, a time delay due to switching is scarecely caused. |
