| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent false setting and perform appropriate setting, with respect to the fluctuations in external power supply voltage by performing threshold setting, in conformity with the external power supply voltage in a contact input circuit by an external power supply of a protective/monitoring/control apparatus that uses a central processing unit. <P>SOLUTION: The digital apparatus includes a signal input section 11 which is connected to the external power supply through a contact to acquire the on/off state of the contact; an input processing section 12, which is connected to the external power supply to output a signal responsive to the voltage of the external power supply; an arithmetic section 14; and a storage section 15. When the voltage of the external power supply is applied to the input processing section, or when the digital apparatus itself is turned on, a voltage threshold for determining the input signal of the contact from the output signal of the input processing section, on the basis of criteria are preset and stored in the storage section. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
