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- Allen Bradley
- 1756-CN2/A
- ControlLogix ControlNet Communication Module
- USA
- 5.1 × 15.2 × 15.2 cm
- 0.3kg
- Xiamen, China
- New & In Stock
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Allen-Bradley 1756-CN2/A Technical Overview and Industrial Application Report
1. Product Introduction
The 1756-CN2/A is a ControlNet communication bridge module designed for high-performance industrial automation systems. It is used to enable deterministic data exchange between programmable automation controllers and ControlNet networks within a chassis-based control system.
This module belongs to a family of high-speed communication interfaces used in distributed control architectures, especially in large-scale manufacturing and process automation environments.
It acts as a network bridge, allowing seamless communication between multiple nodes across a ControlNet backbone while maintaining real-time control performance.
2. Brand and Series Information
- Brand: Industrial automation control brand (ControlLogix ecosystem)
- Series: ControlLogix 1756 series
- Product Family: Communication / Bridge Modules
- Model Type: ControlNet Bridge Module (Dual Capacity)
The 1756 series is widely recognized for modular PLC architecture, high scalability, and industrial-grade communication reliability.
3. Key Functions
- ControlNet network communication interface
- Data bridging between PLC chassis and distributed I/O systems
- Supports high-speed deterministic industrial network traffic
- Enables up to 99 network nodes and approximately 128–131 communication connections
- Used for redundant and non-redundant industrial control systems
4. Product Technical Parameters
| Parameter | Specification |
|---|---|
| Communication Protocol | ControlNet |
| Data Rate | 5 Mbps |
| Maximum Nodes | 99 nodes |
| Maximum Connections | 128–131 Logix connections |
| Power Consumption | 5.6 W |
| Current Draw | 1100 mA @ 5.1V DC |
| Thermal Dissipation | 19.1 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 |
| Isolation Voltage | 30 V basic insulation |
| Network Interface | 1 × ControlNet BNC |
| Module Width | ~35 mm |
| Height | ~145 mm |
| Depth | ~140 mm |
| Dimensions (approx.) | 5.1 × 15.2 × 15.2 cm |
| Weight | ~0.2 kg – 0.3 kg |
5. Product Description (Functional Overview)
The module is designed for integration into a ControlLogix chassis system, where it operates as a dedicated communication bridge. It ensures deterministic data transmission across ControlNet networks, which is essential for synchronized industrial processes.
It supports high-speed communication between controllers, remote I/O racks, and distributed automation devices, making it suitable for complex manufacturing systems requiring reliable real-time control.
6. Applications
The 1756-CN2/A is commonly used in:
- Automotive production lines
- Oil and gas processing systems
- Power generation plants
- Large-scale manufacturing automation
- Conveyor and material handling systems
- Process control systems in chemical industries
- Distributed I/O control networks
It is especially suitable where deterministic network timing and high reliability are required.
7. Product Advantages
- High-speed deterministic communication (5 Mbps)
- Supports large network topology (up to 99 nodes)
- High reliability in industrial environments
- Compact modular design for chassis installation
- Low power consumption (5.6 W)
- Strong electrical isolation for noise resistance
- Stable operation under harsh environmental conditions
- Flexible integration in large automation systems
8. Related Models (Same Series / Closely Related)
ControlLogix 1756 Series Communication Modules
| Model | Description | Key Parameters |
|---|---|---|
| 1756-CN2/A | ControlNet Bridge Module | 5 Mbps, 99 nodes, 0.2–0.3 kg, 5.6 W |
| 1756-CN2R/B | Redundant ControlNet Bridge Module | Dual channel redundancy, higher fault tolerance |
| 1756-EN2T | EtherNet/IP communication module | 10/100 Mbps Ethernet, industrial TCP/IP support |
| 1756-EN2TR | Redundant EtherNet/IP module | Dual-port ring topology support |
| 1756-DNB | DeviceNet scanner module | Device-level network control |
9. Other Popular Modules in Same Brand Ecosystem
High-Demand ControlLogix Modules
| Model | Function | Key Parameters |
|---|---|---|
| 1756-L71 | Controller CPU module | High-performance PLC processor, multi-task control |
| 1756-L72 | Advanced controller | Faster memory processing, larger program capacity |
| 1756-IF8 | Analog input module | 8-channel analog input, industrial signal processing |
| 1756-OB16E | Digital output module | 16-point output, electronic protection |
| 1756-IB16 | Digital input module | 16-channel input, high-density I/O |
10. Engineering Summary
The 1756-CN2/A is a core industrial communication module designed for stable and deterministic ControlNet networking within ControlLogix systems. It is widely used in mission-critical automation environments where uptime, synchronization, and network integrity are essential.
Its compact structure, low power consumption, and high node capacity make it suitable for both medium and large-scale industrial architectures.