| 摘要 |
PROBLEM TO BE SOLVED: To improve the general purpose function of a controller by permitting to add input circuits by the machine specifications in the controller of the construction machinery for inputting movable contact type resistance elements to A/D input port. SOLUTION: A/D input ports P4 to P8 of controller 21 are equipped with a reference voltage output terminal 15 for out-putting reference voltage Vref, a voltage input terminal 16 for inputting the voltage of movable contact type resisting element. For example, a branch circuit 22 is provided for the A/D input port P4 , and if the relay 23 is switched by the ON and OFF of the switch 24, either one of the movable terminal a among the main hydraulic sensor 19 and arm angle sensor 7 is connected to a voltage input terminal 16 of A/D input port P4 , and the detected signal of the relevant sensor can be input to the controller 21.
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