A pushbutton input field device would most likely be used to provide the signal to a discrete input module.

• A. True
• B. False
• C. It would be used for analog input
• D. It would be used for a voltage regulator

Answer: (A)

Pushbutton field devices provide digital, on/off signals. A discrete input module is designed to read these binary states from field devices like pushbuttons, limit switches, and similar momentary contacts. When the button is pressed, the contact closes and the module sees a definite signal; when released, the signal returns to its opposite state. That makes a pushbutton the classic source for a discrete input.

The other options don’t fit because a pushbutton is not an analog source that provides a range of voltages or currents, which is what analog inputs read. A voltage regulator is a power-supply component, not a signal source for a discrete input module.