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- ControlLogix ControlNet Communication Module
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- 140 × 145 × 35 mm
- 0.29kg
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Industrial Communication Module Technical Report
Model: 1756-CN2RXT Redundant ControlNet Extreme Temperature Module
1. Product Overview
The 1756-CN2RXT is a ControlNet redundant communication bridge module designed for extreme environmental conditions. It is part of a high-reliability industrial control system architecture used in distributed automation networks requiring continuous uptime and stable data exchange.
This module extends standard ControlNet functionality by supporting a wider operating temperature range, making it suitable for harsh industrial environments such as outdoor installations, oil fields, and heavy process industries.
It provides deterministic communication between controllers, remote I/O systems, and supervisory control networks while maintaining redundancy for fault tolerance.
2. Brand and Series Information
- Brand: Industrial automation control platform
- Series: ControlLogix 1756-XT (Extreme Temperature Series)
- Product Family: ControlNet Redundant Communication Modules
- Module Type: Dual-channel redundant communication bridge (extended temperature version)
The 1756-XT series is specifically engineered for environments where standard industrial modules cannot reliably operate due to temperature extremes or environmental stress.
3. Product Description
The 1756-CN2RXT operates as a redundant ControlNet communication interface module with dual BNC network ports. It ensures uninterrupted communication by maintaining two parallel ControlNet paths.
If one network path fails, the second path automatically maintains system communication without interruption. This redundancy is essential for mission-critical systems where downtime is unacceptable.
The module supports high-speed deterministic communication at 5 Mbps and integrates into standard ControlLogix chassis systems.
It is designed for extreme conditions, supporting a wider operational temperature range compared to standard CN2R modules.
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 connections |
| Total Connection Capacity | 131 connections |
| ControlNet Ports | 2 × BNC connectors |
| USB Interface | 1 × USB 1.1 |
| 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 | -25°C to 70°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-XT chassis series |
| Slot Width | 1 slot |
| Dimensions | 140 × 145 × 35 mm (approx.) |
| Weight | ~0.29 kg |
5. Product Applications
The 1756-CN2RXT is used in industrial environments requiring both redundancy and environmental robustness:
- Offshore oil and gas platforms
- Mining and heavy extraction equipment
- Outdoor power generation systems
- Harsh climate process automation plants
- Steel and metallurgy production lines
- Remote pipeline monitoring systems
- Chemical processing in extreme environments
- Critical infrastructure automation systems
It is especially suited for installations exposed to high temperature variation, vibration, and harsh industrial conditions.
6. Product Advantages
- Extended temperature operation (-25°C to 70°C)
- Dual-channel redundant ControlNet communication
- High reliability for mission-critical systems
- Stable deterministic data exchange (5 Mbps)
- Strong resistance to vibration and shock
- Industrial-grade electrical isolation
- Designed for harsh and outdoor environments
- Compatible with ControlLogix modular architecture
- Supports large-scale distributed control systems
- High connection capacity for complex networks
7. Same Series / Related Models (ControlLogix XT & ControlNet Family)
| Model | Function | Key Parameters |
|---|---|---|
| 1756-CN2RXT | Extreme temperature redundant ControlNet module | -25 to 70°C, 5 Mbps, 0.29 kg |
| 1756-CN2R | Standard redundant ControlNet module | 0 to 60°C, dual-channel redundancy |
| 1756-CN2XT | Extreme temperature non-redundant module | Single channel ControlNet |
| 1756-CNBR | Basic ControlNet bridge module | Standard industrial environment |
| 1756-EN2TR | Redundant EtherNet/IP module | Ethernet ring redundancy support |
8. Other Popular Modules from Same Ecosystem
| Model | Function | Key Parameters |
|---|---|---|
| 1756-L71 | High-performance PLC controller | Large memory, multi-task processing |
| 1756-L72 | Advanced PLC CPU module | Faster execution and expanded capacity |
| 1756-IF8 | Analog input module | 8-channel analog signal processing |
| 1756-OB16E | Digital output module | 16-point protected output switching |
| 1756-IB16 | Digital input module | 16-channel industrial input module |
9. Engineering Summary
The 1756-CN2RXT is a ruggedized redundant ControlNet communication module designed for harsh industrial environments where standard communication modules cannot operate reliably.
Its extended temperature range, dual-channel redundancy, and stable deterministic communication make it a strong choice for critical infrastructure and outdoor industrial automation systems.
It is widely used in applications where system uptime, environmental resistance, and network reliability are primary engineering requirements.