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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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Adiscrete input, also referred to as a digital input, is an input that is eitherin an ON or OFF condition. Pushbuttons, toggle switches, limit switches,proximity switches, and contact closures are examples of discrete sensors whichare connected to the PLCs discrete or digital inputs. In the ON condition adiscrete input may be referred to as a logic 1 or a logic high. In the OFFcondition a discrete input may be referred to as a logic 0 or a logic low.
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