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- 1756-CN2R
- ControlLogix ControlNet Communication Module
- USA
- 140 × 145 × 112 mm
- 0.64kg
- Xiamen, China
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Industrial Communication Module Technical Report
Model: 1756-CN2R ControlNet Redundant Bridge Module
1. Product Overview
The 1756-CN2R is a redundant ControlNet communication bridge module designed for high-reliability industrial automation systems. It is used in modular PLC architectures to provide stable and deterministic network communication between controllers, distributed I/O systems, and supervisory control platforms.
This module supports redundant network paths, ensuring continuous communication even if one channel fails. It is widely used in large-scale automation environments where system uptime and network stability are critical.
2. Brand and Series Information
- Brand: Industrial automation control platform (ControlLogix ecosystem)
- Series: 1756 ControlLogix Series
- Product Family: Communication / ControlNet Bridge Modules
- Module Type: Redundant ControlNet Communication Interface
The 1756 series is designed for scalable industrial control systems, supporting high-speed communication, modular expansion, and redundant architectures.
3. Product Description
The 1756-CN2R module provides dual-channel ControlNet communication, allowing two independent network paths to operate in parallel or redundant mode. It ensures uninterrupted data exchange in case of network cable failure or module fault.
It supports integration into ControlLogix chassis systems and is commonly used for distributed automation networks, enabling communication between PLCs, remote I/O racks, HMIs, and SCADA systems.
The module operates at a fixed high-speed network rate of 5 Mbps and supports deterministic real-time data transfer.
4. Technical Parameters
| Parameter | Specification |
|---|---|
| Communication Protocol | ControlNet |
| Network Type | Redundant dual-channel |
| Data Rate | 5 Mbps |
| Maximum Nodes | 99 nodes |
| Maximum Logix Connections | 128 |
| Total Connections Capacity | 131 |
| ControlNet Ports | 2 × BNC |
| Configuration Port | 1 × USB |
| Power Consumption | 6.7 W |
| Current Draw | 1300 mA @ 5.1V DC |
| Auxiliary Current | 3 mA @ 24V DC |
| Isolation Voltage | 30 V continuous |
| Thermal Dissipation | 22.9 BTU/hr |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity Range | 5% – 95% non-condensing |
| Vibration Resistance | 2 G (10–500 Hz) |
| Shock Resistance | 30 G |
| Chassis Compatibility | 1756-A4 / A7 / A10 / A13 / A17 |
| Slot Width | 1 slot |
| Dimensions | 140 × 145 × 112 mm (approx.) |
| Weight | 0.29 – 0.64 kg |
5. Product Application Areas
The 1756-CN2R is widely deployed in industrial environments requiring high availability and deterministic communication:
- Automotive manufacturing systems
- Oil and gas processing plants
- Power generation and distribution systems
- Chemical production facilities
- Large-scale conveyor and logistics systems
- Water treatment and infrastructure automation
- SCADA-based monitoring systems
- Distributed control architectures
It is especially effective in systems requiring redundant network communication and continuous uptime operation.
6. Product Advantages
- Dual-channel redundant communication architecture
- High-speed deterministic network performance (5 Mbps)
- Strong fault tolerance for industrial environments
- Supports large-scale network topology (up to 99 nodes)
- High connection capacity (up to 131 connections)
- Stable operation under vibration and shock conditions
- Compact modular design for PLC chassis integration
- Low power consumption with efficient thermal performance
- Compatible with multiple ControlLogix chassis configurations
- Suitable for mission-critical automation systems
7. Same Series / Related Models (ControlLogix 1756 Family)
| Model | Function | Key Parameters |
|---|---|---|
| 1756-CN2R | Redundant ControlNet Bridge | 5 Mbps, 99 nodes, 0.29–0.64 kg, dual BNC ports |
| 1756-CNBR | Standard ControlNet Bridge | Single-channel ControlNet, lower redundancy |
| 1756-CN2 | Non-redundant ControlNet module | Basic ControlNet communication, 5 Mbps |
| 1756-EN2T | EtherNet/IP communication module | 10/100 Mbps Ethernet, industrial TCP/IP |
| 1756-EN2TR | Redundant Ethernet module | Dual-port Ethernet, ring topology support |
8. Other Popular Models from Same Brand Ecosystem
| Model | Function | Key Parameters |
|---|---|---|
| 1756-L71 | PLC CPU controller | High processing power, large memory capacity |
| 1756-L72 | Advanced controller CPU | Faster execution speed, expanded program handling |
| 1756-IF8 | Analog input module | 8-channel analog signal acquisition |
| 1756-OB16E | Digital output module | 16-point electronic output, protected switching |
| 1756-IB16 | Digital input module | 16-channel digital input for field signals |
9. Engineering Summary
The 1756-CN2R is a high-reliability redundant communication module designed for industrial control systems requiring uninterrupted network performance. Its dual-channel architecture ensures continuous operation even under fault conditions, making it suitable for critical automation environments.
With strong environmental resistance, stable network performance, and flexible system integration, it remains a core component in modern distributed control architectures.