Product Details
Product Overview
The Allen-Bradley 1756-A4K functions as the high-integrity foundation for compact ControlLogix control systems. This 4-slot back-panel mount chassis houses the processors, I/O modules, and communication cards required for industrial automation. We provide this unit as 100% Brand New and Original, ensuring peak performance for mission-critical logic control. By utilizing a "K" suffix designation, this specific model incorporates factory-applied conformal coating, providing an essential layer of protection against chemical contaminants and humidity.
Technical Specifications
| Feature | Specification |
| Number of Slots | 4 Slots |
| Mounting Type | Back Panel Mount |
| Power Dissipation | 1.8 Watts |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Environmental Protection | Conformal Coated (K-Version) |
| Net Weight | 0.71 lbs (0.32 kg) |
| Series | ControlLogix 1756 |
Engineering Advantages
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Corrosion Resistance: The conformal coating shields internal circuitry from airborne pollutants, moisture, and salt spray. This feature prevents dendritic growth and premature board failure in wastewater treatment or chemical processing plants.
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Thermal Efficiency: The chassis design optimizes airflow even in high-density enclosures. It maintains stable operation at temperatures up to 60°C, preventing thermal throttling of high-performance Logix processors.
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Space-Saving Footprint: The 4-slot configuration allows engineers to deploy localized control nodes or remote I/O drops in cramped cabinets where larger 7, 10, or 17-slot racks cannot fit.
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High-Speed Backplane: The 1756-A4K provides a high-speed communication bus that synchronizes data across all modules simultaneously. It eliminates bottlenecking in high-motion or rapid-response applications.
FAQs
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What is the significance of the "K" at the end of 1756-A4K?
The "K" signifies that the unit includes a factory-applied conformal coating. This makes the 1756-A4K superior to the standard 1756-A4 for environments involving corrosive gases or high humidity.
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Does this chassis include the power supply?
No. You must purchase the 1756 power supply (such as the 1756-PA72 or PB72) separately. The power supply mounts directly to the left side of the chassis without occupying any of the 4 functional I/O slots.
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Can I mix conformal coated and non-coated modules in this chassis?
Yes, the chassis accepts any standard 1756 ControlLogix module. However, to maintain the environmental integrity of the entire system in harsh conditions, we recommend using "K" version modules throughout the assembly.
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Are the mounting dimensions different from the standard 1756-A4?
No. The 1756-A4K maintains the exact physical dimensions and mounting hole patterns as the non-coated version, allowing for a direct "drop-in" replacement of existing hardware.
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
Preventing Spurious Trips in Emergency Stop Systems: A Technical Guide
In industrial automation, the Emergency Stop (E-Stop) pushbutton is the ultimate safety line. However, relying on a single Normally-Closed (NC) contact can sometimes lead to unexpected spurious trips. As a control systems engineer, I have seen these nuisance trips halt entire production lines, causing significant downtime. Understanding why these components fail and how to implement robust architecture is essential for any reliable DCS or PLC-based safety system.
Sequencing Induction Motor Control with PLC Logic: Best Practices
In modern industrial automation, controlling a group of induction motors requires precision and safety. Uncontrolled simultaneous startup of multiple large motors often causes significant voltage dips, potentially triggering protective trips. Therefore, implementing a sequential startup and shutdown strategy is essential. This approach minimizes inrush current and ensures the system operates within established power constraints. A robust PLC program serves as the ideal engine for orchestrating these sequences.
Mastering PLC Programming: Best Practices for Robust Industrial Automation
Writing clean PLC code requires discipline, especially regarding memory management. Avoid overusing SET and RESET instructions, as they often complicate debugging. If multiple rungs control the same bit, troubleshooting becomes a nightmare. Instead, focus on energizing a bit in only one location. If your logic requires complex conditions, use branches within a single rung. This approach keeps your code readable, maintainable, and significantly easier to audit during downtime.