| 摘要 |
PROBLEM TO BE SOLVED: To improve versatility of a controller of a construction machine for inputting a temperature sensitive resistance element and a movable contact resistance element to an A/D input port by enabling the A/D input port to cope with the necessary number of input circuits to be increased or decreased according to the specifications of the machine. SOLUTION: Input ports P1 -P8 of a controller are provided with a reference voltage output terminal 12 for outputting a reference voltage Vref, a voltage input terminal 13 for inputting the voltage of the temperature sensitive resistance element or the movable contact resistance element, an internal resistive element 14 branched from the voltage input terminal 13, and equipped with an internal resistance Rc, and a ground terminal 15. In connecting the temperature sensitive resistive element such as a thermister, the temperature sensitive resistive element is connected to the voltage input terminal 13, and the reference voltage output terminal 12 and the internal resistive terminal 14 are connected via external harness. In connecting the movable contact resistive element such as a potentiometer, the both ends of the movable contact resistive element are connected to the reference voltage output terminal 12 and the ground terminal 15, and the movable terminal of the movable contact resistive element is connected to the voltage input terminal 13.
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