Allen-Bradley 842HR-SJA3115FWY2 Absolute Encoder

The Allen-Bradley 842HR-SJA3115FWY2 is a 15-bit, single-turn sine/cosine absolute encoder that delivers precise position feedback for high-performance servo drives, providing 32,768 discrete positions per revolution. It features a 12 mm blind hollow shaft, a 5–12 VDC supply, and an MS 10-pin electrical connector, with a sine/cosine output paired to RS-485 serial (Hiperface-compatible) for reliable speed regulation and commutation. With 1,024 sine/cosine cycles per revolution and up to approximately 2 million interpolated counts per revolution, it offers high-resolution motion feedback for CNC machines, robotics, packaging equipment, machine tools, and automated production systems. As part of the Bulletin 842HR family, it is designed for OEM replacement and retrofit within Rockwell Automation environments, supporting absolute position alongside incremental feedback in servo systems.