Allen-Bradley 845D-SJHZ14AGDW4 Rotary Encoder

The Allen-Bradley 845D-SJHZ14AGDW4 is a 1-turn absolute rotary encoder in the 25 mm size class, delivering a single-turn angular position reference for motion-control systems and other automated equipment that require deterministic, non-volatile feedback with each shaft rotation. It operates from a 5 V DC supply with a 5% tolerance and provides 512 counts per revolution, yielding a stable, precise position value across every turn of the shaft. Rockwell Automation identifies this model as an Active member of the 845D family and publishes supporting documentation including the 845D-IN002 product cutsheet and installation instructions, as well as product drawings to aid mounting and integration. Catalog listings from multiple authorized distributors corroborate the 1-turn 845D designation, underscoring its compact, robust footprint and compatibility with standard Allen-Bradley motion interfaces. This combination of absolute position data, compact form factor, and documented installation guidance makes the 845D-SJHZ14AGDW4 a suitable choice for engineers designing feedback loops in automated equipment where predictable, turn-by-turn position is essential.