Product Overview
The Allen-Bradley 1756-CN2R is a high-performance ControlLogix communication module developed by Rockwell Automation. It provides redundant ControlNet connectivity, ensuring continuous network availability in mission-critical applications. This module supports up to 99 ControlNet nodes and offers seamless communication across distributed I/O, HMI, and SCADA systems.
Moreover, it includes dual BNC ControlNet ports for redundant network paths and a USB configuration port for setup flexibility. Designed for harsh industrial environments, the 1756-CN2R ensures superior performance, stability, and long-term reliability.
Functional Highlights
- Redundant ControlNet communication for uninterrupted network operation
- High-speed data transfer at 5 Mbps for time-critical automation processes
- Supports up to 131 total Logix connections for large-scale systems
- USB 12 Mbps configuration port for easy system setup
- Backplane current: 1.3A @ 5.1V DC and 3mA @ 24V DC
- Isolation voltage: 30V DC continuous, 500V tested for 1 minute
- Power dissipation: 6.7W (22.9 BTU/hr)
- Compatible with 1756-A4, A7, A10, A13, and A17 chassis
In addition, its rugged enclosure tolerates vibration (2G) and operational shocks (30G), making it suitable for demanding automation conditions.
Technical Specifications
| Parameter | Details |
|---|---|
| Part Number | 1756-CN2R |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Series | ControlLogix |
| Network Type | Redundant ControlNet |
| Transmission Speed | 5 Mbps |
| Maximum Nodes | 99 |
| Logix Connections | 128 user + 3 system (total 131) |
| Ports | 2x BNC (ControlNet), 1x USB (12 Mbps config) |
| Input Current | 1300 mA @ 5V DC, 3 mA @ 24V DC |
| Isolation Voltage | 30V DC continuous |
| Thermal Dissipation | 6.7 W (22.9 BTU/hr) |
| Operating Temp. | 0°C to 60°C (32°F to 140°F) |
| Humidity | 5–95% non-condensing |
| Shock/Vibration | 30G / 2G |
| Dimensions (mm) | 140 x 112 x 145 |
| Weight | 0.64 lbs (0.293 kg) |
| Revisions | A–C Series |
| Compatible Power Supplies | 1756-PA72, PA75, PB72, PB75, PH75, PC75, PA75R, PB75R, PSCA2 |
Furthermore, the module supports both standard and redundant power configurations, ensuring flexible system design.
System Integration
The 1756-CN2R integrates seamlessly into ControlLogix architectures, enabling real-time communication across distributed automation systems. It is commonly deployed in process automation, material handling, and energy management systems where high availability is critical.
For instance, when used in redundant ControlNet topologies, it ensures continuous data flow between controllers and I/O nodes, even during cable or module failures. Therefore, it is highly suited for manufacturing plants requiring continuous uptime and synchronized control.
Details
| Weight | 0.29 kg |
|---|---|
| Dimensions | 140 × 112 × 145 mm |
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