1756-L55M13 ControlLogix Controller CPU Module | Allen-Bradley

Product Overview

The Allen-Bradley 1756-L55M13 serves as a high-integrity central processing unit (CPU) within the ControlLogix industrial automation platform. This hardware controller executes complex multi-tasking control programs, manages intensive floating-point math routines, and synchronizes distributed digital and analog I/O data tables across large-scale plant processing networks. We supply this mission-critical processor module exclusively in 100% brand new, original factory condition to ensure unblemished firmware stability, eliminate backplane data dropouts, and provide zero runtime hours out of the box.

Technical Specifications

Engineering Advantages

• Optimizes Execution Speeds via Segmented Memory: The hardware splits internal memory allocation into 1.5 MB for data/logic code and 208 KB strictly for I/O mapping arrays. This dedicated architecture ensures the CPU handles communication background loops without delaying high-frequency rung execution or critical process interrupts.

• Maintains Legacy Field Serial Integration: An integrated RS-232 communication port allows the CPU to interface directly with older field hardware, barcode scanners, and local weight indicators. This onboard port eliminates the cost of auxiliary serial interface cards when integrating legacy sub-networks.

• Lowers Thermal Footprint inside Enclosures: The processing unit draws a mere 14 mA from the 24V DC backplane power rail. This minimal current draw decreases ambient heat generation inside completely sealed, unventilated electrical panels, protecting adjacent high-density I/O cards from thermal stress.

• Simplifies Direct Backplane Slot Insertion: The compact 0.79 lbs module fits seamlessly into any standard 1756 ControlLogix chassis slot. Two plastic guides align the multi-pin connector arrays smoothly into the chassis backplane socket, enabling fast drop-in field replacements during plant maintenance intervals.

FAQs

• Does this 1756-L55M13 processor require a non-volatile memory expansion card to run?

  The processor contains 1.5 MB of integrated volatile user memory which handles your active runtime program. However, we highly recommend installing a compatible Allen-Bradley non-volatile CompactFlash card to back up code parameters, preventing application logic loss during total facility power blackouts.

• Is this CPU module an authentic, factory-fresh unit or a refurbished surplus part?

  We guarantee this product is a 100% brand new, authentic factory-original Allen-Bradley processor. It arrives sealed inside its native protective manufacturer packaging with all quality control seals, product serial codes, and tracking barcodes completely intact.

• What vital precautions prevent processor corruption during installation?

  Always switch off all incoming power feeds to the 1756 chassis before sliding the module into place. Put on a verified, grounded electrostatic discharge (ESD) wrist strap, keep your fingers clear of the rear gold-plated connector pins, and push the module firmly into the slot until the top and bottom chassis latches lock securely.