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
Why Programmable Logic Controllers Drop into Stop Mode: An Expert Analysis
Industrial automation systems rely heavily on Programmable Logic Controllers (PLCs) to maintain uninterrupted production. When a PLC unexpectedly shifts from Run to Stop mode, whole manufacturing lines stall.
As control systems evolve across modern factory automation, understanding the root causes of these interruptions helps engineers minimize costly downtime. This technical guide breaks down why PLCs trip into Stop mode and provides practical strategies to mitigate system faults.
Understanding Root Causes of Unplanned PLC Stop Mode in Industrial Automation
Modern Programmable Logic Controllers manage execution through distinct operational states: Run, Stop, Start-Up, and Hold. During power-up, a controller initializes memory registers within Stop mode before briefly transitioning to Start-Up mode. During this phase, internal self-diagnostics evaluate system integrity across hardware and user programs. If the controller detects no critical faults, it enters Run mode to execute the control program continuously. However, any severe system anomaly forces the CPU back into Stop mode immediately to prevent erratic machine behavior across the plant floor.
Human-Machine Interface Design: Essential Guide to HMI Selection, Visualization, and Control System Integration
Human-Machine Interfaces (HMIs) serve as the primary operational window into complex industrial automation systems. Modern HMIs convert raw machine data into clear graphical displays, enabling operators to oversee entire manufacturing processes in real time. Instead of relying on physical control panels full of hardwired switches, engineers program interactive screens using intuitive graphics, dynamic color coding, and responsive touch interfaces. Over my 15 years in control systems engineering, I have observed HMIs transform from basic display screens into sophisticated command centers that drive operational efficiency across DCS and PLC environments.