Input AD port signal, there is no abnormality. The voltage is about 15V after conversion, and the current is 0 under normal circumstances.
As analog signal processing, voltage and current, through partial voltage and operational amplifier, become a voltage signal of 0-2.5v and enter AD port
After several days of working, the result register of AD is read and becomes the maximum value, and the input signal of AD changes, but the value of the result register remains unchanged. See the figure below, the voltage changes to 25.4, the value remains unchanged, and the current changes to 840A
After 2-3 days of power failure, AD collection returned to normal