Overview
The Allen-Bradley 8500-HDM1 is a high-density I/O module engineered for integration into Allen-Bradley 9-series (9/260) CNC control systems. This printed circuit board functions as a solid-state input/output interface, managing dual independent inputs and a single output point to enable coordinated control of motors, actuators, and mechanical systems in automated manufacturing environments. The module’s proven architecture has established it as a critical component in legacy CNC machine tool controllers.
Key Features
- High-density I/O configuration with 2 independent inputs and 1 controlled output
- 24 VDC power supply for compatibility with standard industrial control environments
- Microprocessor-based circuit board architecture for reliable decision logic
- Screw terminal connections for straightforward field wiring installation
- Designed for mounting inside protected control enclosures per IP20 rating
Technical Specifications
| Supply Voltage | 24 VDC |
| Input Count | 2 |
| Output Count | 1 |
| Operating Temperature | 0–60°C (32–140°F) |
| Relative Humidity | 5–95% (non-condensing) |
| Connection Type | Screw Terminals |
| Environmental Protection | IP20 |
| Series | 8500 / 9-series CNC |
| Part Number Variants | 900417, 99557-202, 156733, 160579 |
| Condition | New – No Box |
Typical Applications
The 8500-HDM1 serves mission-critical roles in:
- CNC Machine Control: Manages tool changer actuation, spindle enable/disable, and auxiliary motor outputs
- 3D Printer Integration: Coordinates nozzle control and pneumatic actuator firing
- Lathe & Drill Press Automation: Enables closed-loop feedback and solenoid valve activation
- Manufacturing Automation: Provides real-time input sensing and output control for production machinery
Compatibility & Replacements
The Allen-Bradley 8500-HDM1 is specific to 9-series CNC controllers (9/260, 9/230, 9/290 architectures) and mounts directly to the main control frame. This component is compatible with the 8500 series I/O module family and supports legacy CNC retrofit and maintenance applications. Part numbers 156733, 156730 Rev.02, and 160579 Rev.03 represent various revisions of this module—verify revision compatibility before ordering. When upgrading or replacing legacy systems, consult with your systems integrator regarding modern alternatives such as Rockwell CompactLogix or ControlLogix platforms with distributed I/O architecture.
