The advantage of using a sensor that uses voltage is:

• A. Is that these devices are cheaper to produce
• B. Is that they tolerate higher voltages
• C. Is that they are immune to noise
• D. Is that they have higher bandwidth

Answer: (A)

Voltage-output sensors are usually cheaper to produce because their signal path is simple: the transducer directly generates a voltage that can be read by the PLC’s analog input with minimal additional electronics. That means fewer components, less complex signal conditioning, and no need for a current-loop transmitter, which keeps manufacturing costs down. These cost advantages don’t guarantee higher voltage tolerance, immunity to noise, or broader bandwidth, which depend on the specific design, protections, and wiring rather than the fact that the sensor outputs voltage. In practice, for long runs or noisy environments a current-loop approach might be preferred for its robustness, but the cheaper production is the main benefit of voltage-output sensors.