Why the 1756-CN2RXT Belongs in Your Spare Parts Strategy
Downtime on a ControlNet segment can halt an entire production line. The Allen-Bradley 1756-CN2RXT is a ControlLogix-XT ControlNet redundant media bridge module built for exactly that risk. It keeps controller-to-controller interlocking and I/O updates moving even in corrosive or extreme-temperature environments. For maintenance teams, that means fewer emergency scrambles and lower cost per operating hour.
This module carries 128 standard Logix communication connections plus 3 reserved for redundant control, giving 131 total. It supports up to 99 nodes on the network. The ControlNet communication rate is 5 Mbps. Because the three redundant connections always appear in use, plan your network budget with that in mind — a small detail that prevents expensive re-engineering later.
Technical Specifications at a Glance
| Parameter | Value |
|---|---|
| Module Type | Interface Module |
| Series | ControlLogix |
| Voltage | 5.1 Volts DC |
| Current | 1.3 Amperes |
| Power Dissipation | 6.6 Watts |
| ControlNet Rate | 5 Mbps |
| Logix Connections | 128 |
| Max Connections | 131 |
| Max Nodes | 99 |
| Slot Width | 1 |
| Location | Chassis (Any Slot) |
| Weight | 0.64 lbs (0.293 kg) |
Each figure above translates directly into cost. A 1-slot width preserves chassis space you would otherwise spend on expansion. The 0.64 lbs weight keeps shipping and handling economical. The 5 Mbps rate supports deterministic I/O updates without forcing a network overhaul.
Built for Harsh Environments
The ControlLogix-XT designation matters. This module operates from -25 to 70 °C (-13 to 158 °F). Standard modules often fail in such extremes, leading to unplanned replacement costs and lost production. The 1756-CN2RXT handles those conditions, so you avoid the premium of climate-controlled cabinets in remote or corrosive areas.
It fits any chassis slot and is compatible with the 1756-A4LXT, 1756-A5XT, 1756-A7XT, and 1756-A7LXT ControlLogix chassis. That flexibility lets you standardize spares across multiple line configurations.
Integration and Cabling Notes
The module features one USB 1.1 full speed (12 Mbps) port and two ControlNet BNC ports. These require the 1786-RG6 quad-shield RG6 coaxial cable. When wiring into a ControlNet network, confirm your cable and gateway requirements with your supplier — mismatched media is a common and costly installation mistake.
Practical Selection Advice
Before ordering, verify your chassis model, node count, and connection budget. If your application demands redundant media and wide-temperature operation, this module is the practical choice. Oil AutoTech offers hands-on technical selection help and fast-dispatch spares for oil, gas, and industrial automation. Contact Oil AutoTech today for pricing and availability.
Please verify current lifecycle status and availability with Oil AutoTech before ordering.
