| 摘要 |
PURPOSE:To improve the economy and to simplify a maintenance by adding a displaying circuit for respective functions and informing a person in charge of maintenance of a troubled place without a diagnosing function being equipped by a program control. CONSTITUTION:By a control signal A from a control device 1, circuits (a), (b)...(n) are operated, the control device 1 receives them as a response signal B, a system is normally operated, and when a trouble occurs at any of the circuits (a), (b)...(n), a detecting circuit fetched into respective circuits is operated. Since any of lamps (a'), (b')... (n) lights up and the response signal B is not returned to the control device 1, a device 2 is automatically changed over to a preliminary device 2', and a normal action is maintained at the route of D. The person in charge of maintenance finds out a trouble circuit by lighting up the lamp at once, and replaces it to a preliminary circuit, thereby, being able to recover the device in a short time.
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