| 摘要 |
PURPOSE:To detect a fault of an output signal by using a digital computer and an analog computer which carry out the similar operations and compares the outputs of both computers with each other. CONSTITUTION:The physical quantity of temperature, etc. is detected as a plant input signal 1 by each sensor provided to a plant 10. The signal 1 is supplied to both digital and analog computers 3 and 4 respectively. Then these computers 3 and 4 carry out the digital and analog operations. The outputs of both computers are supplied to a comparator 5. If the difference between both inputs is less than a prescribed error range, no defect is decided to deliver a plant output 2. While this output 2 is inhibited if said difference is larger than the prescribed error range. Then an error signal is delivered to prevent a malfunction of the plant 10. |
