Product Details
Product Overview
The Allen Bradley 1756-CN2RK serves as a high-performance ControlNet communication bridge within the ControlLogix ecosystem. This module facilitates deterministic, high-speed data exchange between controllers and I/O devices across a redundant media topology. We provide this unit as 100% Brand New and Original, featuring factory-applied Conformal Coating to ensure long-term hardware integrity in corrosive or humid industrial atmospheres.
Part Number Breakdown
The 1756-CN2RK alphanumeric code identifies specific technical capabilities:
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1756: Identifies the ControlLogix platform compatibility.
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CN: Designates the ControlNet protocol interface.
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2: Indicates the enhanced "High Performance" series with expanded connection capacity.
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R: Specifies Redundant media support (Dual BNC channels).
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K: Denotes Conformal Coating for environmental hardening.
Technical Specifications
This module manages complex network traffic with the following engineering parameters:
| Feature | Specification |
| Network Protocol | ControlNet |
| Communication Rate | 5 Mbps |
| Channels | Dual (Redundant Media Support) |
| Logix Connections | 128 Maximum |
| Environmental Protection | Conformal Coated PCB |
| Slot Width | Single Slot |
| Weight | 0.88 lbs (0.40 kg) |
| Module Type | Communication Bridge / Rack Mount |
Engineering Advantages
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Redundant Data Pathways: Dual BNC ports allow for media redundancy. If a primary cable fails, the module switches to the secondary path instantly, preventing process downtime and maintaining deterministic control.
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Aggressive Corrosion Resistance: The "K" version conformal coating protects internal circuitry from salt spray, humidity, and chemical contaminants. This makes it essential for wastewater treatment, oil and gas, and chemical processing facilities.
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Expanded Connection Density: Supporting up to 128 Logix connections, this module handles massive I/O counts and multi-controller interlocking without bottlenecking the backplane.
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Deterministic Performance: Unlike standard Ethernet, this module utilizes a scheduled Network Update Time (NUT) to guarantee that critical control data arrives precisely when the logic demands it, eliminating network jitter.
FAQs
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What is the benefit of the "K" suffix on the 1756-CN2RK?
The "K" signifies a conformal coating. This protective layer shields the electronic components from environmental hazards like moisture and corrosive vapors, significantly extending the module's lifespan in harsh plant conditions.
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Does this module support redundant controllers?
Yes. The 1756-CN2RK supports redundant ControlLogix controller architectures. It facilitates the high-speed synchronization required to maintain a seamless transition between primary and secondary processors.
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Can I replace a 1756-CNB with this module?
The 1756-CN2RK offers significantly higher performance and connection capacity than the legacy 1756-CNB. However, you must verify your firmware compatibility and RSLogix/Studio 5000 project configuration before upgrading.
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Is this a factory-sealed unit?
Absolutely. We only supply 100% Brand New original Allen Bradley hardware. Each 1756-CN2RK arrives in its original factory packaging with a clear chain of custody.
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
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.
Essential Best Practices for PLC Wiring and Installation in Industrial Automation
Successful control system deployment begins with thoroughly reviewing manufacturer technical documentation. Controllers from major brands like Allen-Bradley, Siemens, and Schneider Electric feature unique terminal layouts. Engineers must verify voltage requirements before connecting power cables to prevent catastrophic equipment damage. Standard line connections require strict adherence to regional electrical codes and proper wire color coding. Furthermore, panel builders should always establish a robust low-impedance ground connection using at least 16-AWG copper conductor tied directly to the main plant grounding grid.