An analoginput is an input signal that has a continuous signal. Typical analog inputsmay vary from 0 to 20 milliamps, 4 to 20 milliamps, or 0 to 10 volts. In thefollowing example, a level transmitter monitors the level of liquid in a tank.Depending on the level transmitter, the signal to the PLC can either increaseor decrease as the level increases or decreases.
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