Allen-Bradley 1756-L55M24 ControlLogix CPU Module – ControlLogix Series
Imagine a critical production line — an automotive stamping press, a pharmaceutical batch reactor, or a water treatment facility — suddenly losing its controller brain. Without a reliable CPU module at the heart of the ControlLogix chassis, every downstream device goes dark: I/O racks stop responding, motion axes freeze mid-cycle, and safety interlocks can no longer be verified. Unplanned downtime in these environments costs thousands of dollars per minute. The Allen-Bradley 1756-L55M24 CPU Module exists precisely to prevent that scenario, delivering the processing power and memory capacity that mission-critical automation demands.
Within the ControlLogix 1756 platform — Rockwell Automation’s flagship modular PLC architecture and one of the most widely deployed control systems in global heavy industry — the 1756-L55M24 occupies a mid-range position that balances memory depth with cost efficiency. Its 1.5 MB user memory makes it the preferred choice for medium-to-large applications that have outgrown entry-level L55 variants but do not yet require the expanded capacity of the L61/L62 generation. Deployed across North America, Europe, and Asia-Pacific in industries from oil & gas to semiconductor fabrication, this module represents a proven, globally supported automation asset.
Technical Specifications
- Part Number: 1756-L55M24
- Series: ControlLogix (1756 platform)
- Manufacturer: Allen-Bradley / Rockwell Automation
- User Memory: 1.5 MB
- Controller Type: Logix5555 Processor
- Communication: Via 1756 backplane; supports EtherNet/IP, ControlNet, DeviceNet with appropriate comm modules
- Programming Software: RSLogix 5000 / Studio 5000 Logix Designer
- Chassis Compatibility: All 1756 ControlLogix chassis (4, 7, 10, 13, 17-slot)
- Power Supply: Powered via 1756 chassis backplane
- Operating Temperature: 0–60 °C (32–140 °F)
- Certifications: UL, CE, C-Tick (verify current listing with Rockwell)
- Weight: Approx. 300 g
Note: All specifications are sourced from publicly available Rockwell Automation documentation. Verify against the official product bulletin before engineering design-in.
Key Features & Benefits
- 1.5 MB User Memory — Sufficient for complex ladder logic, function block, structured text, and sequential function chart programs running concurrently.
- Logix5555 Processor Core — Deterministic scan times support high-speed discrete, process, and motion control tasks within a single controller.
- Modular Backplane Architecture — Hot-swap capability on supported chassis configurations minimizes maintenance downtime without full system shutdown.
- Unified Tag-Based Programming — Seamless integration with Studio 5000 Logix Designer enables structured, reusable code across the entire ControlLogix family.
- Broad Network Reach — Pairs with 1756-ENBT, 1756-CNB, and 1756-DNB communication modules to span EtherNet/IP, ControlNet, and DeviceNet topologies.
- Proven Global Install Base — Decades of field deployment across regulated and non-regulated industries provide extensive third-party support, documentation, and spare-parts ecosystems.
Industry & Equipment Applications
- Oil & Gas: Pipeline SCADA, compressor control, wellhead automation
- Automotive Manufacturing: Body-in-white welding lines, paint shop conveyors, press transfer systems
- Pharmaceutical & Life Sciences: Batch processing, CIP/SIP skids, cleanroom HVAC control
- Water & Wastewater: Pump station control, filtration sequencing, chemical dosing
- Food & Beverage: Filling lines, pasteurization, packaging automation
- Semiconductor & Electronics: Fab equipment control, environmental monitoring systems
- Power Generation & Utilities: Turbine auxiliary control, substation automation
System Integration & Compatible Parts
The 1756-L55M24 is designed to operate within the broader ControlLogix ecosystem. Commonly paired components include:
- Chassis: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17
- Power Supplies: 1756-PA72, 1756-PB72, 1756-PA75
- EtherNet/IP Modules: 1756-ENBT, 1756-EN2T, 1756-EN2TR
- ControlNet Modules: 1756-CNB, 1756-CNBR
- I/O Modules: 1756-IB16, 1756-OB16E, 1756-IF8, 1756-OF8 and full 1756 I/O range
- Motion Modules: 1756-M02AE, 1756-M03SE (Sercos/analog motion)
- Programming Software: RSLogix 5000 v16+, Studio 5000 Logix Designer v21+
Contact Konmask.com for cross-reference assistance and compatible spare-part sourcing.
Our Quality Assurance Process
- Source Verification: Units are sourced from authorized distributors, OEM surplus, or verified secondary-market channels with full traceability documentation.
- Visual & Physical Inspection: Each module is inspected for physical damage, counterfeit indicators, label authenticity, and firmware revision markings.
- Functional Testing: Where applicable, modules undergo power-on and communication handshake testing prior to shipment.
- Secure Packaging: ESD-safe anti-static bags, foam cushioning, and double-wall cartons protect modules during international transit.
- Documentation: Certificate of conformance and inspection report available upon request.
How to Order
- Submit an inquiry via the Contact / RFQ form on Konmask.com with your required quantity and delivery timeline.
- Our technical team will confirm availability, lead time, and provide a formal quotation within 1 business day.
- Upon PO confirmation, we arrange secure packaging and dispatch with full shipment tracking.
- Post-delivery support is available for installation queries and compatibility verification.
📧 [email protected] | 📞 +0086 19859288691
Why Choose Konmask.com?
- ✅ B2B Industrial Focus — We serve OEMs, system integrators, MRO teams, and plant engineers — not retail consumers.
- ✅ Global Sourcing Network — Access to hard-to-find, obsolete, and long-lead-time Rockwell Automation parts.
- ✅ Technical Expertise — Our team understands ControlLogix architecture and can advise on compatible replacements and upgrades.
- ✅ Fast Quotation — RFQ responses within 24 hours for standard inquiries.
- ✅ Secure International Shipping — Export-compliant packaging and documentation for cross-border orders.
- ✅ Transparent Quality Process — Full inspection reports and traceability documentation on request.
Frequently Asked Questions
Q: Is the 1756-L55M24 still in production by Rockwell Automation?
A: The 1756-L55M24 is a legacy/mature product. Rockwell Automation has transitioned to newer Logix 5000 controller generations. However, it remains widely used in installed base applications, and Konmask.com maintains sourcing channels for both new-old-stock and refurbished units.
Q: What is the difference between the 1756-L55M12, 1756-L55M16, and 1756-L55M24?
A: The suffix denotes user memory capacity — M12 = 750 KB, M16 = 1 MB, M24 = 1.5 MB. The M24 is the highest-memory variant in the L55 sub-family, suitable for larger and more complex programs.
Q: Can the 1756-L55M24 be upgraded to a newer ControlLogix processor?
A: Yes. Rockwell Automation provides migration paths to the 1756-L6x and 1756-L7x/L8x series. The chassis and I/O modules are typically reusable; only the CPU and potentially the power supply require replacement. Contact us for migration planning support.
Q: What programming software is required?
A: RSLogix 5000 (legacy) or Studio 5000 Logix Designer. The minimum compatible version depends on the firmware revision of the specific unit. Our team can advise on firmware-to-software compatibility.
Q: Do you provide a warranty on this module?
A: Warranty terms are provided on a per-order basis and depend on the unit’s sourcing condition (new, tested, or refurbished). Details are included in the formal quotation.
Q: Can you supply multiple units for a plant-wide spare parts program?
A: Yes. Konmask.com supports bulk and blanket-order procurement for MRO and spare-parts programs. Contact us to discuss volume pricing and staggered delivery schedules.
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Contact: [email protected] | +0086 19859288691
