Product Overview
The Allen-Bradley 1440-ACNR is an XM ControlNet Adapter that serves as the critical communication bridge between XM dynamic measurement modules and ControlLogix controllers over a ControlNet network. As part of the Allen-Bradley XM Series condition monitoring platform, the 1440-ACNR provides the interface for controlling XM modules on an XM Bus and transferring measurement data to the processor for real-time analysis . The adapter is specifically designed to work with the 1440-DYN02-01RJ dynamic measurement module, enabling vibration, pressure, and stress monitoring in rotating machinery applications .
The Allen-Bradley 1440-ACNR operates as the parent module in an XM measurement system, supporting up to 10 XM dynamic measurement modules on a single XM Bus network . Communication to the ControlLogix processor occurs over ControlNet at a fixed rate of 5 Mbps, while the XM Bus operates at 500 Kbps for local module communication . This architecture allows high-speed transport of time-critical I/O, interlocking data, and messaging data on a single physical media link, making the 1440-ACNR suitable for demanding condition monitoring and machinery protection applications .
The Allen-Bradley 1440-ACNR features dual ControlNet channels (A and B) for redundant media configurations, providing network path redundancy essential for critical rotating equipment monitoring . The module operates on 24V DC Class 2 power with a maximum current draw of 120 mA and provides 24V DC output at up to 3A to power downstream XM modules via the XM Bus connector . With an operating temperature range of -20°C to +70°C, the 1440-ACNR is engineered for reliable performance in harsh industrial environments .
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | Allen-Bradley 1440-ACNR |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Type | XM ControlNet Adapter |
| ControlNet Communication Rate | 5 Mbps (fixed) |
| XM Bus Communication Rate | 500 Kbps (fixed) |
| I/O Capacity | Maximum 10 XM Dynamic Measurement Modules |
| Compatible XM Module | 1440-DYN02-01RJ |
| Input Voltage | 24V DC (Class 2 power supply) |
| Current Draw | 120 mA maximum |
| XM Bus Output | 24V DC, 3A maximum |
| Isolation Voltage | 50V continuous; tested 900V AC for 60s |
| Operating Temperature | -20°C to +70°C (-4°F to +158°F) |
| Status Indicators | 4 LEDs (Module, Backplane, ControlNet A, ControlNet B) |
Main Features and Advantages
Dedicated ControlNet Communication for XM Modules: The 1440-ACNR provides the sole communication pathway for XM dynamic measurement modules to integrate with ControlLogix control systems. As the parent adapter, the 1440-ACNR manages all data transfer between connected measurement modules and the processor, supporting both scheduled I/O connections and unscheduled messaging for configuration and data retrieval .
Redundant Media Support: The 1440-ACNR features dual BNC coax receptacles for ControlNet channels A and B, enabling redundant media configurations that maintain communication integrity even if one network path fails . This redundancy is critical for condition monitoring applications where continuous data collection is essential for machinery protection.
XM Bus Power Distribution: Beyond communication, the 1440-ACNR provides power distribution to downstream XM modules through the XM Bus connector. The adapter supplies 24V DC at up to 3A maximum, eliminating the need for individual power supplies for each measurement module and simplifying cabinet wiring .
Network Access Port for Programming: A dedicated Network Access Port (NAP) on the 1440-ACNR provides a bidirectional electrical interface for programming terminals, maintenance devices, and I/O monitoring equipment . This allows technicians to connect directly to the ControlNet network for configuration and troubleshooting without disrupting production communications.
Comprehensive Diagnostic LEDs: Four status indicators on the 1440-ACNR display module health, backplane communication status, and individual ControlNet channel activity. The Module indicator shows solid green during normal operation, flashing red for recoverable faults, and solid red for unrecoverable faults .