Allen-Bradley 1756-L72K Logix5572 Harms-Protected Controller

Product Overview

The Allen-Bradley 1756-L72K is a ruggedized ControlLogix Logix5572 Programmable Automation Controller (PAC) engineered by Rockwell Automation for premium performance in highly demanding settings. Equipped with 4 MB of user memory, this high-speed processor handles complex instruction execution and intensive communication routines with an ultra-fast logic processing capability of 0.08 ms per K instruction. What differentiates the 1756-L72K is its specialized conformal coating, which forms a dense protective barrier over the electronic internal circuits. Weighing approximately 0.55 lbs (0.25 kg), this compact, lightweight, yet highly durable processor integrates seamlessly into the backplane of any standard ControlLogix chassis while safeguarding against harsh atmospheric elements.

Key Advantages

• Environmental Stress Protection: The precision-applied conformal coating makes it the perfect fit for heavy-industrial plants where atmospheric dust, moisture, and mild corrosive agents are frequently present.
• High-Density Control Capabilities: The large 4 MB onboard user memory provides adequate memory capacity to house extensive automation programs and manage hundreds of localized or distributed I/O nodes without splitting logic across multiple processors.
• Compact & Lightweight Architecture: With a net weight of just 0.55 lbs (0.25 kg), this unit optimizes slot density and panel configuration without creating unwanted mechanical strain on the chassis framework.
• Extreme Shock and Vibration Resistance: Hardened against severe mechanical stress, the module is operational up to 5g of continuous vibration (10 to 500 Hz) and safely absorbs non-operational physical shocks up to 30g peak.
• Seamless Multi-Network Integration: Supports major plant floor protocols, enabling engineers to tie disparate networks together over the backplane and minimize messy point-to-point field wiring loops.

Technical Specifications

Industrial Applications

Thanks to its resilient architecture, the 1756-L72K module excels across an array of demanding vertical markets:

• Oil, Gas & Chemical Control Systems: Resists the atmospheric compounds and vapors common near refining areas.
• Water and Wastewater Treatment: Sustains long-term operation inside high-humidity pump rooms and chemical dosing areas.
• Automotive & Assembly Manufacturing: Swiftly manages advanced multi-axis motion control loops on highly vibratory production floors.
• Food & Pharmaceutical Production: Offers stability in sterile zones subjected to aggressive washdown procedures or chemical wipe-downs nearby.

Frequently Asked Questions

Q1: What exactly does the "K" suffix indicate on this module?

A1: The letter "K" in the Allen-Bradley numbering format indicates that the processor comes standard with a factory-applied conformal coating. This makes it identical in performance to the standard 1756-L72 module, but adds specific physical defenses against harsh industrial elements.

Q2: Can I install this processor in a chassis next to standard, non-coated modules?

A2: Yes, the 1756-L72K communicates across any standard 1756 ControlLogix backplane slot. Even though it shares the same physical profile and a light 0.55 lbs footprint as standard units, it is highly recommended to pair it with conformally coated I/O modules and power supplies to ensure complete atmospheric protection across the entire frame.

Q3: How much power does this processor draw from the chassis backplane?

A3: The unit draws a continuous current load of 1.5A at a standard backplane voltage of 5V DC. Make sure that your chosen slot supply (such as a 1756-PA75 or similar supply) has enough overhead to deliver this along with any other modules inside the same chassis.