| 摘要 |
<p>PURPOSE: To improve the reliability by using an input check means so as to diagnose a fault of a sensor or the like of the automatic controller thereby avoiding the diagnosis from being interfered. CONSTITUTION: Outputs of sensors read by each of controllers A-C and outputs received precedingly are compared and when any change is recognized, an alarm buzzer 30 is energized for a prescribed time and the sensor output entered this time is updated to the preceding output. Suppose that sensors in common connection are switches 27, 28, and the controllers A-C and interfaces AI-CI or the like receiving signals from the sensors 27, 28 are acted normally, then each of the controllers A-C activates the alarm buzzer 30 intermittently thrice in different operating timing for every ON or OFF time of the switches. When a fault takes place in an input circuit of the sensor 27 connecting to, e.g., the controller B is faulty and a part (x) is broken, then the input signal from the sensor 27 is unchanged and the alarm buzzer 30 is operated twice by the controllers A, C.</p> |
