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- ControlLogix ControlNet Communication Module
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- 140 × 145 × 112 mm
- 0.6kg
- Xiamen, China
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Industrial Communication Module Technical Report
Model: 1756-CNBR ControlNet Redundant Bridge Module
1. Product Overview
The 1756-CNBR is a ControlNet redundant bridge communication module designed for industrial automation systems requiring high availability and stable network performance. It is used to connect ControlLogix controllers to a ControlNet network while providing redundancy for improved fault tolerance.
This module ensures continuous communication even in the event of a network failure by using dual-channel architecture. It is widely used in large-scale industrial environments where downtime is not acceptable and deterministic communication is required.
2. Brand and Series Information
- Brand: Industrial automation control platform
- Series: ControlLogix 1756 Series
- Product Family: ControlNet Communication / Redundant Bridge Modules
- Module Type: Redundant ControlNet Bridge Module
The 1756 series is built for modular industrial control systems, offering scalable architecture, multi-protocol communication, and high reliability for mission-critical applications.
3. Product Description
The 1756-CNBR acts as a redundant communication interface between a ControlLogix chassis and a ControlNet network. It provides two independent communication paths to ensure uninterrupted data transmission.
In case one channel fails, the secondary channel automatically maintains network communication without affecting system operation.
It supports scheduled and unscheduled communication, enabling both real-time control and data exchange between controllers, I/O modules, drives, and supervisory systems.
The module occupies a single slot in a ControlLogix chassis and integrates seamlessly into distributed automation systems.
4. Technical Parameters
| Parameter | Specification |
|---|---|
| Communication Protocol | ControlNet |
| Network Architecture | Redundant dual-channel |
| Data Rate | 5 Mbps |
| Maximum Network Nodes | 99 nodes |
| Maximum Logix Connections | 128 connections |
| Total Connection Capacity | 131 connections |
| ControlNet Ports | 2 × BNC connectors |
| Configuration Port | USB interface |
| Power Consumption | 6.6 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-A series chassis |
| Slot Width | 1 slot |
| Dimensions | approx. 140 × 145 × 112 mm |
| Weight | ~0.30 – 0.60 kg |
5. Product Applications
The 1756-CNBR is widely used in industrial environments that require stable redundant communication:
- Automotive manufacturing systems
- Oil and gas production facilities
- Power generation plants
- Chemical processing industries
- Steel and metallurgy production lines
- Large-scale conveyor and logistics systems
- Water treatment and utility networks
- SCADA-based distributed control systems
It is especially suitable for systems requiring high uptime and fault-tolerant communication networks.
6. Product Advantages
- Dual-channel redundant ControlNet communication
- High network stability and deterministic data transfer
- Supports up to 99 network nodes
- Strong fault tolerance in industrial environments
- Seamless automatic failover between channels
- Stable performance under vibration and electrical noise
- Modular single-slot installation design
- Compatible with large distributed control systems
- Low maintenance requirements
- Proven reliability in mission-critical automation systems
7. Same Series / Related Models (ControlLogix ControlNet Family)
| Model | Function | Key Parameters |
|---|---|---|
| 1756-CNBR | Redundant ControlNet bridge module | 5 Mbps, dual-channel, 0.30–0.60 kg |
| 1756-CN2R | Redundant ControlNet module | Improved redundancy architecture |
| 1756-CN2 | Standard ControlNet module | Single-channel communication |
| 1756-CNB | Basic ControlNet bridge module | Non-redundant, cost-efficient design |
| 1756-EN2TR | EtherNet/IP redundant module | Ethernet ring redundancy support |
8. Other Popular Models in Same Ecosystem
| Model | Function | Key Parameters |
|---|---|---|
| 1756-L71 | PLC controller module | High-speed CPU, large program memory |
| 1756-L72 | Advanced controller CPU | Faster processing capability |
| 1756-IF8 | Analog input module | 8-channel analog signal acquisition |
| 1756-OB16E | Digital output module | 16-point electronic output module |
| 1756-IB16 | Digital input module | 16-channel industrial input module |
9. Engineering Summary
The 1756-CNBR is a robust redundant ControlNet communication module designed for industrial automation systems that require continuous operation and high network reliability.
Its dual-channel architecture ensures uninterrupted communication even under fault conditions, making it suitable for critical industrial environments.
With strong integration capability, stable deterministic performance, and wide compatibility with ControlLogix systems, it remains a widely adopted solution in legacy and hybrid industrial networks.