What is an Analog Input (AI)?
An analog input (AI) is a signal that can have a continuous range of values. These signals are used to read the status of sensors that provide a variable reading, such as temperature sensors (thermocouples, RTDs), pressure sensors, or flow meters.
What is an Analog Output (AO)?
An analog output signal (AO) can also have a continuous range of values and is used to control devices that can be set to variable positions or conditions, such as variable speed drives, or control valves. An analog output could be used, for instance, to set the speed of a motor or the position of a control valve.
What is Digital Input (DI)?
A digital input (DI) is a type of signal that can only have discrete values, typically binary, like 0 (representing off, low, false) and 1 (representing on, high, true). It is used to read the status of binary sensors like limit switches, proximity switches, or photoelectric sensors in a control system.
What is Digital Output (DO)?
A digital output (DO) is a signal that can also have discrete binary values and is used to control devices such as actuators, solenoids, or LEDs. For instance, a digital output could be used to turn a motor on or off.
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