Product Description
The Allen-Bradley 1756-CNB ControlNet Bridge module provides a standard (non-redundant) interface between a ControlLogix rack and a ControlNet network. Supporting up to 64 bidirectional connections and 99 nodes at a 5 Mbps communication rate, it manages I/O data (scheduled and unscheduled) and bridges data between the ControlLogix backplane and the ControlNet network. It supports up to 20 buffers for unconnected messages. Featuring both BNC and RJ45 ports, the module requires node address configuration (01-99) via switches before use, allowing for standalone or redundant control setups (identical node addresses for redundancy). Its power consumption is 970mA at 5.1V DC and 1.7mA at 24V DC, with a power dissipation of 5.14W. The 1756-CNB facilitates distributed I/O applications, network bridging, and communication with HMIs/SCADA systems. It's compatible with various Allen-Bradley ControlNet devices and offers self-diagnostics via online backplane connection and a front panel display showing module status and parameters.
Is Your Device Showing These Signs?
The Allen Bradley 1756-CNB ControlNet bridge module commonly experiences issues such as communication failures due to corrupted firmware, node address conflicts, or physical layer problems like damaged BNC connectors and improper cable termination. Backplane connectivity issues, often stemming from a faulty chassis or power supply, prevent proper module initialization and network communication. Configuration errors within RSLogix 5000, including incorrect network parameters or duplicate node numbers, disrupt network operations. Resolving these problems involves firmware upgrades, verifying node addressing, inspecting cabling and connectors, confirming adequate power supply, and validating the ControlNet configuration within the PLC program.
Technical specifications
The Allen-Bradley 1756-CNB ControlNet Bridge is a module that connects a ControlLogix rack to a ControlNet network. It supports up to 64 connections and 99 nodes at 5 Mbps, managing I/O data and bridging communication between the backplane and the network. It has BNC and RJ45 ports, requires node address configuration, and consumes 970mA at 5.1V DC and 1.7mA at 24V DC. The module is used for distributed I/O, network bridging, and communication with HMIs/SCADA systems, offering self-diagnostics and a front panel display for status monitoring.
Our Repair Process for the
1756-CNB
Our repair process for the Allen Bradley 1756-CNB ControlNet bridge module begins with a comprehensive diagnostic evaluation to pinpoint the root cause of the failure. This includes a thorough inspection of the module for physical damage, particularly to the BNC connectors, followed by verification of backplane connectivity and power supply integrity. Node address conflicts are resolved through meticulous examination and correction of network parameters. Firmware is updated to the latest version to address potential corruption issues. Cabling and termination are rigorously tested to ensure signal integrity. Finally, the ControlNet configuration within RSLogix 5000 is validated, correcting any errors or inconsistencies to restore proper network operation.
Your Guarantee: Warranty & Lifetime Support
Your satisfaction is our top priority, and we confidently stand behind the quality of our repairs. That's why every repair service is covered by our comprehensive 24-month warranty. Furthermore, we offer lifetime phone support – if you have questions or need assistance related to our repair down the road, we're here to help. Our service commitment is straightforward: we guarantee our work, and if you're not satisfied, we will make it right. Learn More about our Repair process.
Comprehensive Repairs You Can Depend On
We take immense pride in the quality and reliability of our work. Our process goes beyond simply fixing the immediate problem. We perform a comprehensive inspection of your main board (or other equipment) and proactively replace components known to be failure-prone or showing signs of potential future failure. Before any item is returned, it undergoes rigorous functional testing to ensure it meets performance specifications and operates flawlessly. Visit our main Repair Services page to learn more.
Save Significantly
Our primary goal is to save you hundreds, or even thousands, of dollars compared to the cost of new equipment replacement. By repairing existing components, we provide an economical solution that is also eco-friendly. At Roc Industrial, our commitment to integrity and community drives our consistent growth and ensures you receive a reliable, cost-effective solution.
Please Note: Roc Industrial operates as an independent service provider and is not an authorized distributor for the manufacturers or brands mentioned. Consequently, the original manufacturer's warranty is not applicable to items repaired or sold by us. Roc Industrial provides its own 2-year warranty on all repair services performed.