Patent ID: 8217823

Claim:
A method for converting an analog input signal received by an analog input module to digital data, the method comprising: receiving, by the analog input module, the analog input signal; converting the analog input signal to a digital data (D 1 ) and storing the digital data (D 1 ) as many as n times for each data conversion period, where n is equal to or greater than 1; supplementing at least one or more final conversion data (D 2 ) determined by previous conversion periods to n number of digital data; sorting the converted n number of digital data (D 1 ) and the supplemented at least one or more final conversion data (D 2 ) in the order of size; determining a value corresponding to an intermediate value among the sorted data as a final conversion data (D 3 ) of the current conversion period; outputting the final conversion data (D 3 ); and storing the final conversion data (D 3 ) for a next period.