Redundant ControlNet Bridge 1756-CN2RXT Allen Bradley XT

Product Overview

The Allen-Bradley 1756-CN2RXT is a ControlLogix-XT redundant media ControlNet bridge module for extended temperature applications. It provides dual BNC ports for redundant ControlNet networks, supporting 128 Logix connections and 99 nodes at 5 Mbps with operation from -25 to +70 °C.

Key Specs

• Communication rate: 5 Mbps
• Logix connections: 128 (131 max with 3 reserved for redundant control)
• Max nodes: 99
• Ports: 2 ControlNet BNC, 1 USB 1.1
• Current draw: 1300 mA @ 5.1 V DC, 3 mA @ 24 V DC
• Power dissipation: 6.6 W
• Operating temperature: -25 to +70 °C
• Weight: 0.293 kg

Why Choose This

• Extended temperature rating for harsh industrial environments
• Redundant media support ensures network availability on single cable failure
• 128 Logix connections support large distributed control architectures
• USB port enables local module configuration and diagnostics

Common Questions

• What cable is required for ControlNet? 1786-RG6 quad-shield RG6 coaxial cable with BNC connectors.
• What is the difference between CN2RXT and CN2R? The CN2RXT is the ControlLogix-XT variant rated for -25 to +70 °C; the CN2R operates from 0 to 60 °C.
• How many connections are available? 128 standard Logix connections plus 3 reserved for redundant control, totaling 131.

Mounting Steps

1. Install the module in any slot of a ControlLogix-XT chassis.
2. Connect the dual BNC ports to the redundant ControlNet network using 1786-RG6 cable.
3. Configure the module in Studio 5000 Logix Designer.
4. Set the ControlNet node address via software.
5. Verify network status LEDs indicate active communication on both channels.

Buying Advice

• Choose 1756-CN2RXT for extreme temperature installations requiring redundant ControlNet.
• For standard environments, the 1756-CN2R offers identical network functionality.
• Compatible with 1756-A4LXT, A5XT, A7XT, and A7LXT ControlLogix-XT chassis.