Allen-Bradley 1756-L72K 4 MB ControlLogix Controller – ControlLogix Series
Imagine a high-speed automotive assembly line suddenly halting mid-shift — not because of a mechanical failure, but because the central controller can no longer handle the volume of I/O data, motion axes, and safety interlocks simultaneously. Without a controller of sufficient memory and processing capacity, modern industrial systems become bottlenecks rather than enablers. The Allen-Bradley 1756-L72K is engineered precisely to eliminate that risk, delivering 4 MB of user memory and the processing muscle required to keep complex, multi-discipline automation running without compromise.
Within the ControlLogix family — Rockwell Automation’s flagship Logix5000 platform — the 1756-L72K occupies a critical mid-to-high tier, offering a substantial memory footprint that bridges the gap between entry-level controllers and the top-of-range 1756-L83E/L85E models. Its global installed base spans automotive, oil & gas, food & beverage, and semiconductor manufacturing, making it one of the most widely deployed ControlLogix controllers in the world. The “K” suffix denotes the enhanced security and firmware feature set introduced in later production runs, aligning with Rockwell’s Defense-in-Depth cybersecurity framework.
Technical Specifications
- Part Number / SKU: 1756-L72K
- Series: ControlLogix (Logix5000)
- Manufacturer: Allen-Bradley / Rockwell Automation
- User Memory: 4 MB
- Controller Type: Programmable Logic Controller (PLC)
- Backplane: 1756 ControlLogix chassis compatible
- Communication: Via 1756-EN2T / 1756-ENBT EtherNet/IP modules (sold separately)
- Programming Software: Studio 5000 Logix Designer (RSLogix 5000 compatible)
- Security Feature: Enhanced firmware security (“K” designation)
- Form Factor: Single-slot ControlLogix chassis module
- Power Supply: Supplied via 1756 chassis backplane
- Operating Temperature: 0 °C to 60 °C (32 °F to 140 °F)
- Storage Temperature: -40 °C to 85 °C
- Relative Humidity: 5% to 95% non-condensing
- Certifications: UL, CE, cUL (verify current listings with Rockwell)
Key Features & Benefits
- 4 MB User Memory: Supports large ladder logic, function block, structured text, and sequential function chart programs — ideal for complex multi-axis motion and safety integration.
- Multi-Discipline Control: Handles discrete, process, motion, and safety control within a single controller, reducing hardware footprint and engineering complexity.
- Enhanced Security (“K” Firmware): Supports Rockwell’s Defense-in-Depth cybersecurity strategy with firmware authentication and access control features.
- Scalable Architecture: Slots seamlessly into any 1756 ControlLogix chassis (4, 7, 10, 13, or 17-slot), enabling flexible system expansion.
- Producer/Consumer Networking: Native support for EtherNet/IP, ControlNet, and DeviceNet via add-on communication modules.
- High-Speed Task Execution: Periodic and event-driven tasks with deterministic scan times for time-critical applications.
- Integrated Diagnostics: Built-in fault logging and status LEDs accelerate troubleshooting and reduce mean time to repair (MTTR).
Industry & Equipment Applications
- Automotive Manufacturing: Body welding lines, paint shop conveyors, powertrain assembly — where multi-axis motion and high I/O counts demand maximum memory.
- Oil & Gas: Pipeline SCADA systems, compressor control, and wellhead automation requiring long-term reliability and cybersecurity compliance.
- Food & Beverage: High-speed packaging lines, filling machines, and CIP (Clean-in-Place) systems with integrated safety.
- Semiconductor & Electronics: Wafer handling, pick-and-place systems, and cleanroom automation with precise motion control.
- Water & Wastewater: Pump station control, SCADA integration, and remote I/O management across distributed plant networks.
- Mining & Metals: Conveyor systems, crusher control, and smelter automation in harsh environments.
System Integration & Compatible Parts
- Chassis: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17
- Power Supplies: 1756-PA72, 1756-PB72, 1756-PA75R (redundant)
- Communication Modules: 1756-EN2T (EtherNet/IP), 1756-CN2 (ControlNet), 1756-DNB (DeviceNet)
- I/O Modules: Full 1756 ControlLogix I/O catalog — digital, analog, motion, and safety
- Redundancy: Compatible with 1756-RM2/A redundancy module for high-availability configurations
- HMI: PanelView Plus 7 / PanelView 5510 via EtherNet/IP
- Programming: Studio 5000 Logix Designer v21 and above
Our Quality Assurance Process
At Konmask.com, every Allen-Bradley 1756-L72K unit undergoes a rigorous multi-stage verification process before shipment:
- Source Verification: Units are sourced from authorized distributors, certified resellers, or directly from controlled factory inventory channels.
- Visual Inspection: Enclosure integrity, label authenticity, firmware version, and connector condition are checked against OEM specifications.
- Functional Testing: Where applicable, modules are bench-tested for power-on self-test (POST) completion and communication response.
- Secure Packaging: Anti-static packaging with humidity indicators and shock-watch labels to protect against transit damage.
- Documentation: Each shipment includes a certificate of conformance and traceability records upon request.
How to Order
- Submit your inquiry via the Contact / RFQ form on this page or email support@konmask.com.
- Provide your required quantity, delivery timeline, and destination country.
- Our team will respond within 1 business day with availability, lead time, and a formal quotation.
- Upon PO confirmation, we arrange secure packaging and international freight (DHL / FedEx / UPS / sea freight).
- Tracking information and shipping documents (commercial invoice, packing list, COC) are provided upon dispatch.
Why Choose Konmask.com?
- ✅ Specialized in Industrial Automation: Focused exclusively on PLC, DCS, HMI, servo, and automation components — not a generalist marketplace.
- ✅ Global B2B Export Experience: Serving engineering firms, system integrators, and MRO buyers across 40+ countries.
- ✅ Competitive Pricing: Direct sourcing relationships enable pricing advantages over traditional distribution channels.
- ✅ Fast Response: Dedicated technical sales team responds to RFQs within 24 hours.
- ✅ Reliable Logistics: Experienced in export documentation, customs compliance, and international freight coordination.
- ✅ After-Sales Support: Technical guidance on installation, firmware compatibility, and system integration available post-purchase.
Frequently Asked Questions
Q: What is the difference between 1756-L72 and 1756-L72K?
A: The 1756-L72K is a later revision of the 1756-L72 with enhanced firmware security features aligned with Rockwell Automation’s Defense-in-Depth cybersecurity framework. The “K” suffix indicates this security-enhanced variant. Both share the same 4 MB user memory and ControlLogix platform compatibility.
Q: Is the 1756-L72K compatible with RSLogix 5000?
A: Yes. The 1756-L72K is fully compatible with RSLogix 5000 and its successor, Studio 5000 Logix Designer. Rockwell recommends using Studio 5000 v21 or later for full feature support.
Q: Can the 1756-L72K be used in a redundant controller configuration?
A: Yes, when paired with the 1756-RM2/A redundancy module and a compatible chassis, the 1756-L72K supports controller redundancy for high-availability applications.
Q: What chassis slots does the 1756-L72K occupy?
A: The 1756-L72K occupies a single slot in any 1756 ControlLogix chassis.
Q: Do you provide export documentation for international orders?
A: Yes. We provide commercial invoices, packing lists, certificates of conformance, and can assist with country-of-origin documentation. Contact us for specific requirements.
Q: What is the typical lead time?
A: Lead time varies by stock availability. In-stock units typically ship within 3–5 business days. For out-of-stock items, our team will provide an estimated lead time with your quotation.
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