The KEYENCE FS-V Series, including the FS-V11 main unit and the FS-V21/FS-V22 expansion units, represents a versatile and highly reliable line of digital fiber optic amplifiers. Designed for precision industrial automation, these amplifiers feature multiple operation modes such as SUPER, TURBO, and FINE to accommodate a wide variety of detection requirements and target types. With adjustable response times (40ms, 10ms, and OFF) and reliable 12-24V DC operation, the FS-V series ensures accurate sensing in demanding manufacturing environments. The modular design allows for seamless integration of expansion units alongside the main unit, significantly reducing wiring complexity and saving valuable DIN-rail panel space.