ProductPRODUCT
Featured products
Contact Us
- Allen Bradley
- 1756-CNB
- ControlLogix ControlNet Communication Module
- USA
- 140 × 145 × 35 mm
- 0.26kg
- Xiamen, China
- New & In Stock
- T/T, PayPal, Western Union
- 1 Year
- 1-3 Working Days
- DHL, UPS, TNT, FedEx and EMS.
- 24-Hour Service
- COO
- 4
Our advantage
Global Logistics
We have a 10-year logistics and express cooperation agreement, so our products can be shipped to any place in the world.
Brand new and original
Our products are imported in bulk from the place of origin. Because of the cooperative relationship, our products are all original and 100% new.
24-hour service
We provide 7*24 hours service to our customers. We will be there whenever you need us.
Price advantage
All our products are priced very favorably because we have our own warehouse and supply.
| Company Information | |||
| [email protected] | |||
| Mobile | +8615980777398 | ||
| +8615980777398 | |||
| 15980777398 |
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.