Research on Offest and Gain Calibration to Input Module by Analog Output Module

PLC can control parameters such as temperature,pressure,flux,etc.by various I/O modules.The offest and gain calibration of the analog input module are both misscellaneous and essential work.It is an important prerequisite to use I/O modules correctly and carry out analog control.The hardware calibration also needs stabilized input signal source besides high-accuracy measuring device.The stable output characteristic of the analog output module is used as the input signal source to coordinate PLC program composition to calibration to the analog input module offest and gain value calibration to the hardware calibration.Its effect is fine and can be applied to teaching train and enterprises.