The term that describes inputs and outputs that have only two states: on and off is:

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Multiple Choice

The term that describes inputs and outputs that have only two states: on and off is:

Explanation:
Two-state signals are binary: either on or off, 1 or 0. In PLC terminology, these are described as discrete devices, designed to switch between two states. Examples include pushbuttons or limit switches that provide input when pressed or reached, and relay coils or contactors that produce on/off outputs. This is different from analog devices, which vary continuously over a range (like a sensor that measures pressure or temperature with a range of values), and from transducers, which convert one form of energy to another. A sensor can be digital or analog, but the term that specifically describes two-state inputs and outputs is discrete devices.

Two-state signals are binary: either on or off, 1 or 0. In PLC terminology, these are described as discrete devices, designed to switch between two states. Examples include pushbuttons or limit switches that provide input when pressed or reached, and relay coils or contactors that produce on/off outputs. This is different from analog devices, which vary continuously over a range (like a sensor that measures pressure or temperature with a range of values), and from transducers, which convert one form of energy to another. A sensor can be digital or analog, but the term that specifically describes two-state inputs and outputs is discrete devices.

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