Product Overview

The Allen-Bradley 1756-N2 (Series B) is a critical mechanical component for any partially populated ControlLogix system. While it contains no electronic circuitry, it performs the essential task of sealing empty chassis slots to ensure the structural and thermal integrity of the PLC rack. We provide this unit as 100% Brand New and Original, ensuring a perfect factory fit that safeguards your backplane connectors from environmental contaminants and physical damage.

Technical Specifications

Engineering Advantages

• Optimized Thermal Management: Empty slots disrupt the internal pressure of a chassis, causing cooling fans to pull air through the path of least resistance rather than over hot modules. The 1756-N2 forces airflow across active processors and I/O modules, preventing localized hotspots and extending the life of your electronics.

• Backplane Connector Shielding: Exposed backplane pins attract conductive dust, moisture, and debris. This module covers the unused slot connectors, eliminating the risk of short circuits or oxidation that can lead to intermittent system failures.

• Compliance with Safety Standards: In many industrial jurisdictions, open chassis slots violate safety codes regarding "accidental contact." Installing the 1756-N2 creates a touch-safe barrier, preventing fingers or tools from making contact with live backplane voltages.

• Professional Aesthetics and Stability: Beyond protection, slot fillers provide structural rigidity to the chassis and present a clean, finished appearance for control cabinets, which is a hallmark of high-standard industrial installations.

FAQs

Does the 1756-N2 require any software configuration in Studio 5000?

No. Since the 1756-N2 lacks a backplane interface and electronic components, the controller does not "see" the module. You do not need to add it to your I/O tree or configure any software parameters.

Is there a difference between 1756-N2 and 1756-N2/B?

The "/B" signifies Series B. Series B modules typically feature updated plastic molding or revised latching mechanisms for better durability compared to the original Series A. They remain fully backward compatible with all standard 1756 ControlLogix chassis.

Can I leave slots empty if my cabinet is air-conditioned?

Even in air-conditioned environments, we strongly recommend using the 1756-N2. Air-conditioning does not prevent dust accumulation or accidental physical contact with the backplane. Furthermore, the module is necessary to maintain the specific aerodynamic profile required by the ControlLogix chassis design for internal heat dissipation.

How many 1756-N2 modules do I need?

You should purchase one 1756-N2 for every unused slot in your ControlLogix chassis. For example, if you have a 10-slot chassis but only use 6 modules, you require 4 slot fillers to fully seal the system.