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- Allen Bradley
- 1756-CNBR/E
- ControlLogix ControlNet Communication Module
- USA
- 284 × 194 × 69 mm
- 0.293kg
- Xiamen, China
- New & In Stock
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Industrial Communication Module Technical Report
Model: 1756-CNBR/E ControlNet Redundant Bridge Module
1. Product Overview
The 1756-CNBR/E is a redundant ControlNet communication bridge module designed for high-availability industrial automation systems. It is used to connect ControlLogix controllers to a ControlNet network while ensuring continuous communication through dual-channel redundancy.
This module is commonly deployed in distributed control systems where downtime is not acceptable. It supports deterministic data exchange between controllers, remote I/O devices, drives, and supervisory systems across a ControlNet architecture.
The “/E” revision represents an updated hardware generation with improved reliability and compliance refinements compared to earlier versions.
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 (Series E revision)
The 1756 platform is designed for modular automation systems, supporting scalable network architectures and multi-protocol industrial communication.
3. Product Description
The 1756-CNBR/E functions as a ControlNet network bridge with built-in redundancy capability. It provides two independent ControlNet channels, allowing continuous communication even if one network path fails.
It supports scheduled and unscheduled communication, enabling both real-time deterministic control and flexible data exchange.
The module integrates into a ControlLogix chassis and communicates with the backplane to exchange data with PLC processors and I/O modules.
It is widely used in medium to large-scale automation systems requiring stable and fault-tolerant communication infrastructure.
4. Technical Parameters
| Parameter | Specification |
|---|---|
| Communication Protocol | ControlNet |
| Network Type | Redundant dual-channel |
| Data Rate | 5 Mbps |
| Maximum Network Nodes | 99 nodes |
| Maximum Logix Connections | 40–48 typical (up to 64 max) |
| Total Connection Capacity | 131 connections |
| ControlNet Ports | 2 × BNC connectors |
| Network Access Port | 1 × RJ45 (NAP) |
| Power Consumption | 5.1 W |
| Current Draw | 1.0 A @ 5.1V DC |
| Auxiliary Current | 2 mA @ 24V DC |
| Thermal Dissipation | ~17–18 BTU/hr |
| Operating Temperature | 0°C to 55°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 operating |
| Chassis Compatibility | 1756 series chassis (any slot) |
| Slot Width | 1 slot |
| Dimensions | approx. 284 × 194 × 69 mm |
| Weight | ~0.293 kg |
5. Product Applications
The 1756-CNBR/E is used in industrial automation environments requiring redundant and deterministic communication:
- Automotive manufacturing production lines
- Oil refining and petrochemical plants
- Power generation and energy distribution systems
- Large-scale material handling and conveyor systems
- Water treatment and infrastructure control networks
- Chemical processing facilities
- Steel and heavy industry automation systems
- SCADA-based distributed control systems
Its redundancy capability makes it suitable for mission-critical industrial communication networks.
6. Product Advantages
- Dual-channel ControlNet redundancy for high availability
- Stable deterministic communication at 5 Mbps
- Supports up to 99 network nodes
- Reliable failover between redundant channels
- Strong resistance to electrical noise and vibration
- Modular single-slot chassis design
- Compatible with large-scale distributed systems
- Low power consumption and stable thermal performance
- Suitable for continuous 24/7 industrial operation
- Proven reliability in legacy and modern hybrid systems
7. Same Series / Related Models (ControlLogix ControlNet Family)
| Model | Function | Key Parameters |
|---|---|---|
| 1756-CNBR/E | Redundant ControlNet bridge module (Series E) | Dual-channel, 5 Mbps, ~0.293 kg |
| 1756-CNBR | Standard redundant ControlNet module | Same architecture, older revision |
| 1756-CN2R | Enhanced redundant ControlNet module | Improved redundancy handling |
| 1756-CNB | Basic ControlNet bridge module | Single-channel, non-redundant |
| 1756-CN2 | Standard ControlNet communication module | Single-channel ControlNet support |
8. Other Popular Modules in Same Ecosystem
| Model | Function | Key Parameters |
|---|---|---|
| 1756-L71 | PLC processor module | High-performance CPU, large memory |
| 1756-L72 | Advanced controller module | Faster execution and extended capacity |
| 1756-IF8 | Analog input module | 8-channel industrial analog acquisition |
| 1756-OB16E | Digital output module | 16-point electronic output control |
| 1756-IB16 | Digital input module | 16-channel digital input module |
9. Engineering Summary
The 1756-CNBR/E is a mature redundant ControlNet communication module designed for industrial systems that require high availability and stable deterministic networking.
Its dual-channel architecture ensures uninterrupted communication in the event of network failure, making it suitable for mission-critical automation environments.
With strong compatibility across the ControlLogix platform and proven industrial reliability, it remains a widely used solution in both legacy and modern automation systems.