How does an encoder-based position sensing differ from limit switches?

• A. It measures voltage
• B. It is a purely mechanical device
• C. It tracks movement counts for precise position; limit switches provide fixed end-of-travel references
• D. It cannot be used outdoors

Answer: (C)

Encoders provide position feedback by counting movement signals, so you can know the exact position along the travel path with high resolution. They can track rotation or linear movement and, with incremental or absolute types, offer continuous position data and even reference position after power-up. Limit switches, on the other hand, are simple mechanical sensors that signal when a moving part reaches a fixed point at the ends of travel. They don’t provide ongoing position information—only a binary indication that a limit has been reached. That fundamental difference is why this option is the best description: encoders give precise position by counting movement, while limit switches serve as fixed end-of-travel references. The other statements don’t capture this distinction: encoders aren’t about measuring voltage, they aren’t purely mechanical, and outdoor suitability isn’t the defining contrast.