Analog input module expansion

Here take a 12 bit analog input as an example, analog signal to 0 ~ 5V standard voltage form into the signal input, plc digital input application 12 bit MAX187 conversion chip A/D realize analog conversion.

MAX187 is the 12 serial A/D, with a high conversion speed, the sampling frequency is 75kHz, input module plc and it is suitable for the process control of higher precision.

Taking into account the high frequency interference in the real industrial scene, the low-pass filter is used before the sampling signal MAX187.