| 摘要 |
<p>PURPOSE: To easily and securely find a fault such as the fusing of the contact of a relay in real time. CONSTITUTION: A microcomputer 12 decides whether or not the control output relay 11 is normal on the basis of the combination of the potential of a driving voltage output port OUT2 as 1st data regarding the operation state of an electric feeding control transistor(TR) 17 which controls electricity feeding to the relay coil 8 of the control output relay 11, the potential of a contact output data input port IN5 as 2nd data regarding the contact output of the relay contact 9 corresponding to the operation state, and the potential of a monitor data input port IN4 as 3rd data corresponding to the electricity feeding state of the relay coil 8. If the relay is abnormal, it is decided which of a fault of the electricity feeding control TR 17, etc., and the fusing of the relay contact causes the abnormality.</p> |
