Allen-Bradley 1756-A4K ControlLogix 4-Slot Conformal Coated Chassis

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

Engineering Advantages

• 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.

• 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.

• 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.

• 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

• 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.

• 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.

• 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.

• 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.