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:
-
1756: Identifies the ControlLogix platform compatibility.
-
CN: Designates the ControlNet protocol interface.
-
2: Indicates the enhanced "High Performance" series with expanded connection capacity.
-
R: Specifies Redundant media support (Dual BNC channels).
-
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
-
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.
-
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.
-
Expanded Connection Density: Supporting up to 128 Logix connections, this module handles massive I/O counts and multi-controller interlocking without bottlenecking the backplane.
-
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
-
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.
-
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.
-
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.
-
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
Strategic Selection: Choosing the Right SCADA Software for Your PLC Project
In industrial automation, the SCADA (Supervisory Control and Data Acquisition) system acts as the bridge between raw machine data and actionable human intelligence. Selecting the incorrect software platform can lead to integration bottlenecks, scalability issues, and excessive long-term maintenance costs. As an automation consultant with 15 years of experience, I have guided many projects through the selection process. Below are the essential criteria for choosing a platform that ensures both performance and longevity.
Ensuring Operational Continuity: The Strategic Value of Redundant Automation Systems
In modern industrial landscapes, unplanned downtime is the ultimate adversary. For sectors relying on complex PLC and DCS architectures, a single hardware failure can trigger catastrophic production losses. Therefore, implementing redundant automation systems is no longer a luxury; it is a fundamental requirement for mission-critical operations. In this article, I analyze why redundancy remains the backbone of reliable industrial infrastructure.
Selecting the Right Cables for Industrial Automation: A Comprehensive Guide
Selecting the appropriate cabling infrastructure is critical for the success of any industrial automation project. Improper cable selection often leads to signal degradation, system instability, and costly downtime. As an automation engineer, I frequently see projects compromised by poor cabling choices in harsh industrial environments. This guide simplifies the complex landscape of cabling to help you make informed decisions for your PLC, DCS, and control systems.