Allen Bradley 1756-CN2R ControlLogix Communication Module

Product Introduction

The Allen-Bradley 1756-CN2R is a ControlLogix ControlNet communication module designed for high-speed, deterministic networking between ControlLogix controllers, I/O modules, and other ControlNet devices. It provides reliable real-time data transmission and supports a large number of nodes and connections, enabling complex industrial automation networks.

The 1756-CN2R allows integration of ControlLogix systems into distributed control architectures, offering robust communication, high throughput, and flexible network configuration. Its design ensures compatibility with standard ControlNet devices while providing efficient management of network traffic for critical industrial processes.

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Product Specifications

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Applications

• Used for real-time networking of ControlLogix controllers and I/O modules in distributed control systems

• Suitable for high-speed industrial communication networks with multiple nodes and devices

• Applied in manufacturing, process automation, and batch control systems

• Enables integration with existing ControlNet networks and external devices

• Ideal for systems requiring deterministic, high-throughput communication and robust network management

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Advantages

• High transmission rate (5 Mbps) ensures fast and reliable data exchange

• Supports up to 99 nodes and 131 total connections for large-scale network deployment

• Seamless integration with ControlLogix controllers simplifies network setup and configuration

• Low power and thermal dissipation minimize energy usage and heat generation

• Open-style enclosure rating allows flexible mounting in industrial panels

• Designed for robust performance in electrically noisy and industrial environments

FAQ

1. What is the primary function of the 1756-CN2R module?
   It provides high-speed ControlNet communication between ControlLogix controllers, I/O modules, and other networked devices.

2. How many devices can be connected to a single CN2R module?
   It supports up to 99 nodes on the ControlNet network.

3. What is the maximum number of Logix connections supported?
   The module supports up to 128 Logix connections.

4. Can it coexist with other network protocols?
   Yes, it is designed to operate on ControlNet networks but can be integrated with other protocol networks using appropriate gateways.

5. What is the data transmission rate?
   It transmits data at 5 Mbps over the ControlNet network.

6. What is the purpose of wiring categories on ControlNet ports?
   Wiring categories define isolation and protection levels according to industrial standards to ensure safety and signal integrity.

7. Does the module generate significant heat?
   No, power dissipation is 6.7 W with thermal dissipation of 22.9 BTU/h, suitable for standard industrial enclosures.

8. Can it be used in open-style industrial panels?
   Yes, the module is rated for open-style mounting.

9. What operating temperature range is supported?
   The module operates from 0 to 60 °C.

10. How is the module installed in the ControlLogix system?
    It is mounted in a ControlLogix chassis and communicates via the backplane with the controller and other modules.

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