Patent ID: 9036313
Filing Date: 2015-05-19
Classification: G05B

Abstract:
1. An apparatus for protecting an analog input module, the apparatus comprising: an analog input module configured to convert one of a plurality of positive/negative analog signals inputted from the outside thereof into a digital signal and insulate the converted digital signal; and a stabilization unit configured to supply voltages of the positive/negative analog signals to the analog input module when the voltage levels of the plurality of positive/negative analog signals are higher than the levels of positive/negative operating voltages in the analog input module, wherein the stabilization unit comprises: a plurality of first diodes configured to respectively supply the positive operating voltage to a positive power terminal of the analog input module; a plurality of second diodes configured to respectively supply the plurality of positive analog signals to the positive power terminal of the analog input module; a plurality of third diodes configured to respectively supply the negative operating voltage to a negative power terminal of the analog input module; and a plurality of fourth diodes configured to respectively supply the plurality of negative analog signals to the negative power terminal of the analog input module.