2-wire and 3-wire DC sensors and interfacing considerations.

• A. 2-wire sensors have separate power, ground, and signal.
• B. 2-wire sensors form a simple current path and 3-wire sensors have separate power, ground, and signal.
• C. 3-wire sensors always provide a higher current than 2-wire.
• D. 2-wire sensors cannot be used with PLCs.

Answer: (B)