Product Details
Overview
The 1756-CNB (1756-CNB) is a high-performance communication bridge specifically designed for the ControlLogix® platform. It facilitates deterministic, high-speed data transfer between a controller and remote I/O devices or other controllers across a ControlNet™ network. This module serves as a critical link in industrial architectures requiring scheduled data delivery and hardware redundancy. By occupying a single slot in any 1756 chassis, it provides the backbone for coordinated motion, complex drive control, and distributed process automation.
Detailed Technical Specifications
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Network Interface: ControlNet Bridge
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Transmission Rate: 5 Mbps fixed
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Node Capacity: Supports up to 99 nodes per network
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Logical Connections: 64 maximum connections
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Backplane Current (5.1V DC): 970 mA
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Backplane Current (24V DC): 1.7 mA
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Total Power Dissipation: 5.1 Watts
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Thermal Output: 17.4 BTU per hour
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Chassis Slot Width: 1 (Single Slot)
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Configuration Interface: RSNetWorx for ControlNet
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Diagnostic Indicators: Status LEDs for module health and network activity
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Operating Temperature: 0 to 60 °C (32 to 140 °F)
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Storage Temperature: -40 to 85 °C (-40 to 185 °F)
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Relative Humidity: 5 to 95% non-condensing
Operational Capabilities
The 1756-CNB (1756-CNB) allows for seamless bridging between networks without the need for additional programming. It supports the producer/consumer model, which optimizes network bandwidth by allowing multiple nodes to consume the same data simultaneously. This module is essential for applications where timing is critical, such as high-speed bottling lines or synchronized axis control, ensuring that control data arrives at its destination with minimal jitter.
Engineering FAQ
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Does the 1756-CNB support redundant media?The 1756-CNB (1756-CNB) features two BNC connectors for redundant coaxial cable connections. This ensures that if one cable path is severed, the module continues to communicate via the secondary path without system interruption.
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How do I set the node address for this module?The node address (01–99) is manually selected using the two rotary switches located on the side of the module before installation into the chassis.
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What is the difference between the 1756-CNB and 1756-CN2?While both are ControlNet bridges, the 1756-CNB (1756-CNB) is the standard performance version. The 1756-CN2 series offers significantly higher connection capacities and faster CPU processing for larger, more complex I/O trees.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Understanding Safety Relays in Industrial Automation: Architecture, Operation, and Functional Safety
Standard electromechanical relays provide basic electrical isolation between low-voltage control circuits and high-power output loads. A traditional switching relay features a magnetic coil driving mechanical Common (COM), Normally-Open (NO), and Normally-Closed (NC) contacts. However, standard relays pose severe functional risks when deployed in critical safety interlock circuits. High current inrush or mechanical wear can weld contacts together permanently. If contact welding occurs in an emergency stop circuit, pressing the button fails to halt hazardous machinery movements. Consequently, global functional safety standards prohibit standard relays for critical machine guarding functions.
Mastering Wire Identification in Industrial Automation: The Power of Ferrules and Cross-Ferruling
Proper wire labeling forms the cornerstone of reliable control system installation and long-term maintenance. In complex industrial automation environments, technicians terminate thousands of conductor ends inside control panels, marshalling racks, and field junction boxes. Ferrules serve as individual tube-shaped sleeve markers slipped onto conductors before final termination. While technicians historically relied on pre-printed individual letter rings, modern control panel builders utilize automated ferrule printing machines. These thermal-transfer printers generate durable, single-sleeve heat-shrink tags directly matching approved wiring schematics, significantly accelerating cabinet assembly workflows.
Understanding Marshalling Cabinets in Industrial Automation and Control Systems
Marshalling cabinets serve as the crucial connection hub between field instruments and centralized processing units. In large DCS and PLC control system architectures, hundreds of multipair field cables run from local junction boxes to the central instrument equipment room. The marshalling cabinet houses field terminal blocks, surge arresters, intrinsic safety isolation barriers, and interposing relays. By segregating field field-wiring terminations from sensitive processor hardware, engineers protect expensive controller backplanes from high-voltage transients. Consequently, this modular separation dramatically streamlines maintenance workflows and simplifies system expansion.