Allen-Bradley 845H-SJHN24FWY2C Incremental Encoder

The Allen-Bradley 845H-SJHN24FWY2C is an incremental encoder designed for servo-flange mounting in a size-25 frame, delivering high-precision rotary feedback for industrial motion-control systems. It uses a 3/8 inch shaft with a flat for secure coupling, runs on 8–24 V DC unregulated power, and provides 1,024 pulses per revolution through RS-422 differential outputs, with a radial side connector to simplify wiring in control panels. As part of the 845H family, this model combines the size-25 form factor, servo-flange mounting, and 1,024 PPR resolution to support accurate position and speed sensing in legacy automation installations and servo-driven machinery. In practice, engineers select the 845H series for reliable feedback in CNCs, packaging lines, and other automated equipment where robust encoder performance under demanding conditions is required.