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- ControlLogix ControlNet Communication Module
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- 140 × 145 × 112 mm
- 0.65kg
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Industrial Communication Module Technical Report
Model: 1756-CN2RK ControlNet Redundant Bridge Module
1. Product Overview
The 1756-CN2RK is a high-reliability redundant ControlNet communication module used in modular industrial control systems. It is designed to support deterministic, high-speed communication between controllers, distributed I/O, and supervisory systems within large-scale automation architectures.
This module is built for environments where continuous communication is critical, providing redundancy to prevent downtime caused by single-point network failures. It is typically installed in a ControlLogix chassis-based system.
2. Brand and Series Information
- Brand: Industrial automation control ecosystem
- Series: ControlLogix 1756 Series
- Product Family: ControlNet Communication / Redundant Bridge Modules
- Module Type: Dual-channel redundant ControlNet interface
The 1756 series is known for its modular structure, allowing flexible system expansion and integration of multiple industrial communication protocols.
3. Product Description
The 1756-CN2RK module provides redundant ControlNet network communication, ensuring that two independent communication paths operate simultaneously. If one network channel fails, the second channel continues operation without interruption.
It is designed for high-availability systems where downtime is not acceptable, such as continuous production lines and critical infrastructure control systems.
The module supports integration into standard ControlLogix chassis and works as a communication bridge between controllers, remote I/O systems, and distributed industrial devices.
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 |
| Programming/Config Port | USB interface |
| Power Consumption | 6.7 W |
| Current Draw | 1300 mA @ 5.1V DC |
| Auxiliary Power | 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 – 0.65 kg |
5. Product Application Areas
The 1756-CN2RK is widely used in industrial environments that require stable and uninterrupted communication:
- Automotive manufacturing assembly systems
- Oil refinery and petrochemical plants
- Power generation and distribution systems
- Steel and heavy industry automation lines
- Water treatment and utility control systems
- Large-scale conveyor logistics systems
- SCADA-based centralized monitoring systems
- Redundant distributed control systems
Its redundant architecture makes it suitable for mission-critical industrial operations.
6. Product Advantages
- Dual-channel redundant ControlNet communication
- High reliability in continuous operation environments
- Real-time deterministic network performance (5 Mbps)
- Supports up to 99 network nodes
- High connection capacity for complex control systems
- Strong resistance to vibration and electrical noise
- Compact modular design for easy chassis integration
- Stable performance under harsh industrial conditions
- Designed for zero-downtime automation systems
- Compatible with large-scale distributed control architectures
7. Same Series / Related Models (ControlLogix 1756 Family)
| Model | Function | Key Parameters |
|---|---|---|
| 1756-CN2RK | Redundant ControlNet bridge module | 5 Mbps, dual-channel, 0.30–0.65 kg, 1-slot module |
| 1756-CN2R | Standard redundant ControlNet module | Dual-channel redundancy, slightly older revision |
| 1756-CNBR | Single-channel ControlNet bridge | Non-redundant, basic communication support |
| 1756-CN2 | Basic ControlNet module | Single network channel, standard performance |
| 1756-EN2TR | Redundant EtherNet/IP module | Dual Ethernet ports, ring redundancy support |
8. Other Popular Models from Same Ecosystem
| Model | Function | Key Parameters |
|---|---|---|
| 1756-L71 | PLC processor module | High-speed control CPU, large memory capacity |
| 1756-L72 | Advanced PLC controller | Faster processing, extended program storage |
| 1756-IF8 | Analog input module | 8-channel precision analog signal acquisition |
| 1756-OB16E | Digital output module | 16-point electronic output with protection |
| 1756-IB16 | Digital input module | 16-channel industrial digital input module |
9. Engineering Summary
The 1756-CN2RK is designed for high-reliability industrial communication systems requiring redundancy and uninterrupted data flow. Its dual-channel architecture ensures continuous operation even in the event of network failure.
With strong environmental resistance, stable network synchronization, and modular integration capability, it is widely used in critical industrial automation systems where downtime is not acceptable.
The module represents a mature solution for deterministic ControlNet communication in large-scale distributed control environments.