ANALOG INPUT CIRCUIT OF PLC SYSTEM AND METHOD FOR CONTROLLING THE SAME

摘要

PURPOSE: An analog input circuit of a PLC system is provided to minimize the offset/gain setting time with respect to respective channels by compensating of signals respectively inputted through the channels. CONSTITUTION: A personal computer(120) outputs offsets or gains inputted with respect to respective channels. An analog input module(101) receives channel signals and the offsets/gains from the personal computer and converts the respective analog signals with respect to the plural channels into digital signals. A PLC central processing unit(110) receives and calculates externally measured values through the analog input module(101). An amplifier(102) amplifies an analog signal inputted through input terminals by an amplitude gain according to a gain signal.