Product Overview
The Allen-Bradley 1756-CN2 is a ControlLogix ControlNet Dual Capacity Bridge Module engineered to connect ControlNet links and route messages across your automation network. With support for up to 100 Logix connections and 99 nodes, this module delivers high-speed, deterministic communication for distributed I/O and real-time control. Built for demanding industrial environments, the 1756-CN2 ensures reliable data exchange between controllers, I/O modules, and operator interfaces.
Key Technical Specifications
The 1756-CN2 offers robust performance with the following measurable parameters:
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Maximum Nodes: 99
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Maximum Connections: 131
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ControlNet Communication Rate: 5 megabits per second
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Input Current: 1100 mA at 5.1 V DC, 3 mA at 24 V DC
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Thermal Dissipation: 19.1 BTU/hr
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Power Dissipation: 5.6 W
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Slot Width: 1
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Weight: 0.57 lb (0.26 kg)
These specifications confirm the 1756-CN2 as a compact, efficient bridge module capable of handling heavy ControlNet traffic without compromising system performance.
Real-World Applications
The Allen-Bradley 1756-CN2 excels in applications requiring high-speed I/O bridging and remote device management. Typical use cases include:
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Distributed I/O Control: Monitor and control I/O modules located away from the main ControlLogix controller, reducing wiring costs and improving system flexibility.
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Multi-Network Routing: Bridge ControlNet links to route messages to devices on other networks, enabling seamless integration of legacy and modern automation components.
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Data Exchange via Produced/Consumed Tags: Transfer scheduled data between controllers and remote devices, ideal for coordinated motion or process control.
In each scenario, the 1756-CN2 delivers dependable, low-latency communication that keeps production lines running smoothly.
Installation & Setup Guidance
Installing the 1756-CN2 is straightforward. The module occupies a single slot and can be placed in any slot of the ControlLogix chassis. Follow these steps for proper setup:
- Power down the chassis before inserting the module.
- Align the module with the chassis backplane and push firmly until seated.
- Connect the ControlNet cable using either the BNC or RJ45 port, depending on your network topology.
- Use the USB 1.1 port for local configuration and diagnostics.
- Configure the module using RSNetWorx for ControlNet to set node addresses and schedule data transfers.
Ensure the ControlNet cable is a quad shield RG6 coaxial type for optimal signal integrity.
Maintenance & Reliability
Regular maintenance ensures long-term reliability. The 1756-CN2 operates within a temperature range of 0 to 60 °C and a relative humidity of 5–95% (non-condensing). Inspect the module periodically for dust accumulation and ensure proper airflow around the chassis. Check cable connections for tightness and signs of wear. With minimal moving parts, the module offers a long service life when kept within environmental limits.
Compatibility & Integration
The 1756-CN2 is a member of the ControlLogix family and integrates seamlessly with Allen-Bradley controllers and I/O modules. It supports the ControlNet network protocol and uses CIP (Common Industrial Protocol) for high-speed performance. The module also supports P2P (peer-to-peer) communication, enabling direct data exchange between nodes. This compatibility makes it an ideal choice for both new installations and upgrades to existing ControlNet networks.
Buying Guide
Before purchasing the Allen-Bradley 1756-CN2, verify your system's requirements:
- Confirm the number of nodes and connections needed for your application.
- Check that your ControlNet cabling and connectors are compatible.
- Ensure the module's power consumption is within your chassis power budget.
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