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"The Analog Input Module (AIN) is a key subsystem in the PLC. AINs come in many variations to condition real world physical parameters, such as, Temperature, Pressure, Force, or Strain. Typically, these AIN inputs are command signals in both voltage (e.g. ±10V) and current form (e.g. 4-20mA)."
<https://www.learnvern.com/iot-arduino-tutorial/what-is-analog-input>