| 摘要 |
PURPOSE:To decrease the number of contact points by charging the voltages of plural sensors in a capacitor connected to the relay contact points of the respective sensors and the relay contact point of a common line, and switching the relay contact point and applying the voltages to a detecting circuit. CONSTITUTION:The output terminal 12 of sensors 1 are connected as common lines to contact points 51 of relays 5 and one side of the capacitor 201 is connected as a common line to contact points 52 of the relays 5. Then the relays 2 are driven by a driving circuit 4 and the relays 5 are driven by a diode 401 every time the relays 2 operate. Namely, the potential difference between the output terminals 11 and 12 of each sensor 1 is charged in the capacitor 201 through the contact points of the relays 2 and 5 to operate the driving part 4 and then the voltage is applied to the input/output terminals 31 and 32 of a detecting circuit 3. Consequently, the common lines are switched by the relays to decrease the number of the contact point greatly.
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