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- 1756-CNB
- ControlLogix ControlNet Communication Module
- USA
- 140 × 145 × 35 mm
- 0.26kg
- Xiamen, China
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Industrial Communication Module Technical Report
Model: 1756-CNB ControlNet Bridge Module
1. Product Overview
The 1756-CNB is a ControlNet communication bridge module designed for modular industrial control systems. It is used to connect a ControlLogix chassis to a ControlNet network, enabling deterministic high-speed communication between controllers, remote I/O systems, drives, and supervisory control platforms.
This module operates as a non-redundant communication interface and is widely used in medium to large-scale industrial automation systems where stable real-time data exchange is required.
It supports scheduled and unscheduled communication, making it suitable for both motion control and process control applications.
2. Brand and Series Information
- Brand: Industrial automation control platform
- Series: ControlLogix 1756 Series
- Product Family: ControlNet Bridge / Communication Modules
- Module Type: Single-channel ControlNet Bridge Module
The 1756 series is designed for scalable automation systems, supporting distributed control architecture, modular expansion, and multi-protocol industrial communication.
3. Product Description
The 1756-CNB functions as a communication bridge between the ControlLogix backplane and the ControlNet network. It allows PLC controllers to exchange real-time data with distributed devices over a deterministic network.
It supports up to 99 network nodes and provides high-speed communication at 5 Mbps, ensuring stable and synchronized industrial control.
The module is typically installed in a ControlLogix chassis and occupies a single slot. It integrates one ControlNet BNC port and one programming/network access port.
It is widely used in non-redundant communication architectures where cost efficiency and reliability are both important.
4. Technical Parameters
| Parameter | Specification |
|---|---|
| Communication Protocol | ControlNet |
| Network Type | Single-channel (non-redundant) |
| Data Rate | 5 Mbps |
| Maximum Network Nodes | 99 nodes |
| Maximum Logix Connections | 40–48 typical (up to ~64 depending configuration) |
| ControlNet Port | 1 × BNC connector |
| Network Access Port | 1 × RJ45 (NAP port) |
| Power Consumption | ~5.1 W |
| Current Draw | 970 mA @ 5.1V DC |
| Auxiliary Current | 1.7 mA @ 24V DC |
| Thermal Dissipation | ~17.4 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 operating |
| Chassis Compatibility | 1756 series chassis (any slot) |
| Slot Width | 1 slot |
| Dimensions | approx. 140 × 145 × 35 mm |
| Weight | ~0.26 kg |
5. Product Applications
The 1756-CNB is widely used in industrial automation systems requiring deterministic communication:
- Automotive production lines
- Material handling and conveyor systems
- Oil and gas process control systems
- Power generation and distribution automation
- Water treatment facilities
- Chemical processing plants
- Packaging and manufacturing systems
- Distributed I/O control networks
It is particularly effective in systems where ControlNet is used for real-time scheduled data exchange between controllers and field devices.
6. Product Advantages
- Stable deterministic communication at 5 Mbps
- Supports up to 99 network nodes
- Simple single-slot modular installation
- Reliable scheduled and unscheduled data handling
- Low power consumption (approx. 5 W)
- Strong industrial noise immunity
- Flexible integration into ControlLogix architecture
- Proven long-term stability in industrial environments
- Compatible with wide range of ControlNet devices
- Cost-effective solution for non-redundant networks
7. Same Series / Related Models (ControlLogix Communication Family)
| Model | Function | Key Parameters |
|---|---|---|
| 1756-CNB | Standard ControlNet bridge module | 5 Mbps, 99 nodes, ~0.26 kg, single channel |
| 1756-CNBR | Redundant ControlNet bridge module | Dual-channel redundancy support |
| 1756-CN2 | Enhanced ControlNet bridge | Improved performance, single channel |
| 1756-CN2R | Redundant ControlNet module | Dual-path communication architecture |
| 1756-EN2TR | Redundant EtherNet/IP module | Ethernet ring topology, high-speed TCP/IP |
8. Other Popular Models in Same Ecosystem
| Model | Function | Key Parameters |
|---|---|---|
| 1756-L71 | PLC processor module | High-speed CPU, large memory capacity |
| 1756-L72 | Advanced controller CPU | Faster processing and extended program storage |
| 1756-IF8 | Analog input module | 8-channel industrial analog signal input |
| 1756-OB16E | Digital output module | 16-point electronic output protection |
| 1756-IB16 | Digital input module | 16-channel digital signal acquisition |
9. Engineering Summary
The 1756-CNB is a foundational ControlNet communication module used in ControlLogix systems for deterministic industrial networking. Its single-channel architecture makes it suitable for cost-efficient, stable, and medium-complexity automation systems.
It provides reliable communication between controllers and distributed devices while maintaining predictable network timing and synchronization.
Although newer Ethernet-based solutions exist, the 1756-CNB remains widely used in legacy and hybrid industrial systems due to its stability and installed base.