Disconnection detecting apparatus and method
AssigneeLsis Co., Ltd.
InventorJung Wook Kim
Life of this patent
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Abstract
Provided is a disconnection detecting apparatus for detecting whether there is a disconnection between a current signal output device and an external device receives the current signal of a PLC analog current output module. The disconnection detecting apparatus according to an embodiment includes a monitoring unit generating different voltages according to whether a current signal input from the current signal output device is applied to the external device, a reference voltage generating unit generating a reference voltage, a comparing unit outputting a voltage according to a result obtained by comparing the voltage generated from the monitoring unit with the reference voltage, and a switching unit outputting a disconnection detecting signal on the basis of the voltage output from the comparing unit.
Claims9
A disconnection detecting apparatus for detecting a state of a wire connecting a current signal output device to an external device, the apparatus comprising:
- a monitoring unit generating different voltages according to whether a current signal input from the current signal output device is applied to the external device;
- a reference voltage generating unit generating a reference voltage;
- a comparing unit outputting a positive voltage or a negative voltage according to the reference voltage and a voltage generated from the monitoring unit;
- and
- a switching unit configured to be turned on by a negative voltage output from the comparing unit when the voltage generated from the monitoring unit is greater than the reference voltage and to output a disconnection detected signal.
Dependencies are inferred from the claim text.