| 摘要 |
PURPOSE:To effectively utilize the life of a non-volatile memory and to effectively use the service life of the device by writing a new data into the non-volatile memory after checking the validity of a data set by a coefficient setting board. CONSTITUTION:When the new data is set by the coefficient setting board, this data is written into a two port memory 90. By utilizing the idle time of control arithmetic, a CPU 60 periodically inputs the data from the memory 90 and knows a change. When there is the change, a new coefficient is stored into a first RAM 30. Next, the new coefficient is read from the RAM 30 and the validity is confirmed and judged. When there is any abnormality, the abnormality is announced through the memory 90 to the coefficient setting board 10. When the data is normal, the new coefficient is written into a non-volatile memory 20. Next, the written data is read out and confirmed to judge the validity. When there is any abnormality, the abnormality is announced through the memory 90 to the setting board 10. When the data is normal, the new coefficient is stored into a second RAM 40 and the normal end is announced through the memory 90 to the setting board 10. Thus, the service life of the device can be effectively utilized. |
