{"product_id":"ab-allen-bradley-1756-l55m16-logix5555-processor-7-5-mb-memory","title":"AB Allen-Bradley 1756-L55M16 Logix5555 Processor 7.5 MB Memory","description":"\u003ch3\u003eProduct Summary\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1756-L55M16\u003c\/strong\u003e is a \u003cstrong\u003eControlLogix Logix5555 Controller\u003c\/strong\u003e by Rockwell Automation, featuring \u003cstrong\u003e7.5 MB user memory\u003c\/strong\u003e and integrated serial communication. It is part of the second-generation ControlLogix 5550\/5555 processor family, offering enhanced performance over the original Logix5550 with faster scan times and expanded memory capacity for complex industrial automation applications.\u003c\/p\u003e\n\n\u003ch3\u003eCore Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel Number:\u003c\/strong\u003e 1756-L55M16\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e ControlLogix Logix5555 Controller\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUser Memory:\u003c\/strong\u003e 7.5 MB\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eI\/O Capacity:\u003c\/strong\u003e 128,000 digital \/ 4,000 analog I\/O points\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAnalog Output (Max):\u003c\/strong\u003e 2,000\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProgram Scan Time:\u003c\/strong\u003e 0.08 ms\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChassis Slots:\u003c\/strong\u003e 4, 7, 10, 13, 17 (1756 series)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCommunication:\u003c\/strong\u003e RS-232 serial; EtherNet\/IP, ControlNet, DeviceNet via 1756 communication modules\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProgramming:\u003c\/strong\u003e RSLogix 5000\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Allen-Bradley by Rockwell Automation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eElectrical \u0026amp; Functional Characteristics\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBackplane Current:\u003c\/strong\u003e 1.23 A at 5 VDC; 14 mA at 24 VDC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePower Dissipation:\u003c\/strong\u003e \u0026lt;6.2 W typical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTask Types:\u003c\/strong\u003e Continuous, periodic, and event tasks\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSerial Port:\u003c\/strong\u003e RS-232 for DF1, DH-485, or ASCII protocols\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUSB Port:\u003c\/strong\u003e Not included\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStatus Indicators:\u003c\/strong\u003e RUN, FORCE, I\/O status, and RS-232 activity LEDs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKeying:\u003c\/strong\u003e Electronic keying prevents incorrect module insertion\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSystem Integration \u0026amp; Compatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Platform:\u003c\/strong\u003e ControlLogix 1756 chassis\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible I\/O:\u003c\/strong\u003e All 1756-series digital, analog, specialty, and safety I\/O modules\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCommunication Modules:\u003c\/strong\u003e 1756-ENBT, 1756-EN2T, 1756-CNBR, 1756-DNB\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRedundancy:\u003c\/strong\u003e Compatible with 1756-RM redundancy modules for paired chassis configurations\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSoftware Version:\u003c\/strong\u003e RSLogix 5000 v16 or later\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRelated Parts:\u003c\/strong\u003e 1756-L55M12 (750 KB), 1756-L55M13 (1.5 MB), 1756-L55M14 (3.5 MB), 1756-L55M24 (3.5 MB with M24 memory)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eEnvironmental \u0026amp; Operational Limits\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e 0°C to 60°C (32°F to 140°F)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStorage Temperature:\u003c\/strong\u003e -25°C to +70°C (-13°F to 158°F)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHumidity:\u003c\/strong\u003e 5% to 95% RH, non-condensing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVibration:\u003c\/strong\u003e 2G, 10 to 500 Hz\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShock:\u003c\/strong\u003e 30G operating; 50G non-operating\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApprovals:\u003c\/strong\u003e UL Listed, CE, C-UL\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIndustrial Applications\u003c\/h3\u003e\n\u003cp\u003eWidely deployed in manufacturing, material handling, packaging, automotive assembly, food \u0026amp; beverage processing, water\/wastewater treatment, and general industrial automation requiring medium to large program memory and high-speed control on the legacy ControlLogix 5555 platform.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003eWhat is the 1756-L55M16 used for?\u003c\/h4\u003e\n\u003cp\u003eIt is a ControlLogix Logix5555 processor with \u003cstrong\u003e7.5 MB user memory\u003c\/strong\u003e, designed for medium to large-scale industrial automation applications requiring substantial program capacity and fast scan times.\u003c\/p\u003e\n\n\u003ch4\u003eWhat is the difference between 1756-L55M16 and 1756-L55M14?\u003c\/h4\u003e\n\u003cp\u003eThe \u003cstrong\u003e1756-L55M16\u003c\/strong\u003e has \u003cstrong\u003e7.5 MB\u003c\/strong\u003e user memory. The \u003cstrong\u003e1756-L55M14\u003c\/strong\u003e has \u003cstrong\u003e3.5 MB\u003c\/strong\u003e user memory. Both are Logix5555 processors with identical I\/O capacity and communication capabilities.\u003c\/p\u003e\n\n\u003ch4\u003eIs the 1756-L55M16 still supported by Rockwell Automation?\u003c\/h4\u003e\n\u003cp\u003eNo — the Logix5555 platform is \u003cstrong\u003elegacy\/obsolete\u003c\/strong\u003e. Rockwell Automation no longer manufactures or supports these processors. Replacement units must be sourced from authorized surplus dealers or refurbishment services. Consider migrating to the 1756-L7x or L8x series for new applications.\u003c\/p\u003e\n\n\u003ch4\u003eWhat battery does the 1756-L55M16 use?\u003c\/h4\u003e\n\u003cp\u003eThe controller uses a \u003cstrong\u003e3V lithium battery\u003c\/strong\u003e (1756-BA1 or equivalent) to retain RAM data during power loss. Battery life is approximately 2–3 years under normal operating conditions.\u003c\/p\u003e\n\n\u003ch4\u003eWhat are the related part numbers?\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1756-L55M12 — Logix5555, 750 KB memory\u003c\/li\u003e\n  \u003cli\u003e1756-L55M13 — Logix5555, 1.5 MB memory\u003c\/li\u003e\n  \u003cli\u003e1756-L55M14 — Logix5555, 3.5 MB memory\u003c\/li\u003e\n  \u003cli\u003e1756-L55M16 — Logix5555, 7.5 MB memory (this part)\u003c\/li\u003e\n  \u003cli\u003e1756-L55M24 — Logix5555, 3.5 MB memory (with M24 memory module)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":53684224688312,"sku":"1756-L55M16","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/1756-L55M16.png?v=1782974486","url":"https:\/\/www.globalpetroparts.com\/products\/ab-allen-bradley-1756-l55m16-logix5555-processor-7-5-mb-memory","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}