A push button input field device would most likely be used to provide the signal to an analog input module.

• A. True
• B. False
• C. It would be used for a digital input module
• D. It would be used for a timing module

Answer: (B)

A push button is a digital input device because it provides a binary on/off signal. An analog input module expects a continuous voltage or current that can vary over a range to represent a value. Since a push button only changes between two states, it fits with a digital input module, not an analog one. If you connected it to an analog input, you’d not get a meaningful analog reading—just a fixed high or low (or potentially nothing useful if the signal isn’t within the analog range). A timing module isn’t involved in sensing a switch, so it wouldn’t be appropriate either. In practice, a push button is read by a digital input and may be debounced in software or with hardware to avoid false triggers.