Overview
The Allen-Bradley 845H-SJHZ24-CNY1-C is an optical incremental encoder designed to provide accurate feedback for motion control and positioning applications. This Size 25 encoder features a 3/8-inch shaft with a servo flange configuration, making it compatible with a range of industrial servo motors and actuators. The incremental output delivers high-resolution position data essential for closed-loop control in manufacturing, material handling, and assembly operations.
Key Features
- 500 PPR Resolution: Delivers 500 pulses per revolution for accurate speed and position measurement across the shaft rotation.
- 8–24 V DC Power Supply: Wide input voltage range simplifies integration with multiple control voltage standards.
- RS-422 Output: Digital output protocol ensures noise-immune signal transmission over longer cable runs in industrial environments.
- Axial Connector Termination: Industry-standard connector interface for quick connect/disconnect without soldering.
- Servo Flange Mount: Rigid, direct-drive flange coupling with 3/8-inch shaft provides solid mechanical integration and minimal runout.
Technical Specifications
- Part Number: 845H-SJHZ24-CNY1-C
- Encoder Type: Optical Incremental
- Size: 25 (metric frame designation)
- Input Voltage: 8–24 V DC (unregulated)
- Logic Output: RS-422 (5 V DC derived)
- Resolution: 500 PPR (pulses per revolution)
- Shaft Diameter: 3/8 inch
- Mounting Style: Servo Flange, English
- Connector Type: Axial (end-mounted, 10-pin)
- Condition: Used, Tested
Typical Applications
- Servo motor feedback for precision positioning systems
- Speed measurement and regulation in conveyor and transport systems
- Closed-loop motion control on CNC machines and automated assembly lines
- Velocity feedback for variable-frequency drives (VFDs) and AC servo controllers
- Industrial robot arm and gantry positioning
Compatibility & Replacements
The 845H-SJHZ24-CNY1-C is part of Rockwell Automation’s Bulletin 845H incremental encoder family. Related models with similar form factors and electrical characteristics include the 845H-SJHZ24-CMY2C (radial connector variant) and 845H-SJHZ24-FWY2C (flange-mount with different connector). When sourcing replacements, verify encoder resolution (PPR), connector pinout, and mounting geometry to ensure drop-in compatibility. Discontinued models may be found through authorized distributors and surplus suppliers specializing in legacy industrial automation components.
