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
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