When engineers hear the term Redundant Rotary Position Sensor, many assume it simply provides a backup in case one channel fails. In reality, modern Redundant Output sensors offer far more than redundancy. By continuously comparing two independent output channels from a single sensor, control systems can detect developing faults, validate position feedback in real time, and improve overall system reliability. This article explains how dual-channel rotary position sensors support early fault detection, why they are increasingly used in industrial automation, medical equipment, and mission-critical systems, and how they help engineers move from reactive maintenance to proactive diagnostics.