| 摘要 |
PURPOSE:To improve the reliability of diagnosis by inverting the stored data each time to read them via a digital input/output device and performing the checking process based on the read data. CONSTITUTION:A CPU1 inverts logically the prescribed data each time in order to perform diagnosis of each part in response to an interruption delivered from a timer 2 every fixed time. Then the CPU1 delivers the inverted data to a digital output device 8 and reads the data sent back via the device 8, a digital output device 9 and a bus 3. Furthermore the CPU1 performs a checking process for errors of the data and compares this checking result with the key data stored previously in a ROM4 for decision of a normal or abnormal state. |
