{"product_id":"1756-l55m14-allen-bradley-controllogix-5555-processor-1-5-mb","title":"Processeur Allen-Bradley ControlLogix 5555 1756-L55M14 (1,5 MB)","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview and Industrial Computing Heritage\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-L55M14 (1756L55M14)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a robust, high-performance central processing unit within the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eControlLogix 5555\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efamily. It was engineered to manage complex control tasks in the era of early Integrated Architecture, providing a bridge between legacy automation and modern Ethernet-based systems. Featuring\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1.5 MB of user memory\u003c\/strong\u003e, this controller is ideal for medium-to-large scale applications that require extensive data tracking, complex floating-point math, and coordinated motion. The\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-L55M14\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eutilizes a modular memory design (M14), allowing for reliable program execution in industries ranging from automotive assembly to high-volume pharmaceutical packaging.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eHardware Architecture and Memory Dynamics\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-L55M14\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a chassis-based processor that occupies one slot in a 1756 ControlLogix rack. Its architecture is designed for deterministic logic execution and high-speed backplane communication.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eUser Memory (1.5 MB):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe \"M14\" suffix designates the specific non-volatile memory module installed. This capacity allows for substantial program logic and tag storage.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNon-Volatile Storage:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eCompatible with\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-M1, -M2, and -M3\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eexpansion memory modules. For permanent backup, it supports the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-BA1\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eor\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-BA2\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003elithium batteries to retain the volatile RAM contents during power-down.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMultitasking Operating System:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSupports multiple tasks with different priorities, including continuous, periodic, and event-based tasks, ensuring critical control loops are never delayed by background communication.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSerial Interface:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIncludes a built-in\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eRS-232 (DF1\/DH-485)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eport, enabling direct connection for local programming, HMI interfacing, or modem communication.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e1756-L55M14\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eAllen-Bradley \/ Rockwell Automation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eUser Memory\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e1.5 MB\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eI\/O Memory\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e208 KB\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eDigital I\/O (Max)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e128,000\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eAnalog I\/O (Max)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4,000\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eTotal I\/O (Max)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e128,000\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackplane Current (5V)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1.25 A\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackplane Current (24V)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e14 mA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 60 Celsius\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eShipping Weight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e1.1 kg\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eIntegrated Technical FAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between the 1756-L55 and the newer 1756-L6x processors?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-L55\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eseries utilizes a physically separate memory module (like the M14) that is plugged into the processor board, whereas the 1756-L6x (5560) series has integrated onboard memory. The L55 also relies on a battery for RAM retention, while newer models use energy storage modules (ESMs) and internal flash.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I clear a \"Solid Red OK\" LED on this processor?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA solid red OK light typically indicates a non-recoverable hardware fault. However, you can attempt to cycle power and perform a factory reset by removing the battery and shorting the battery terminals on the processor (with power off) to clear the memory. If the red light persists after a firmware re-flash, the unit may require hardware repair.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the 1756-L55M14 compatible with the latest version of Studio 5000?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-L55\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eseries is supported up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eRSLogix 5000 version 16\u003c\/strong\u003e. It is not compatible with version 17 or higher (including Studio 5000). For modern software compatibility, a migration to the 1756-L7x or L8x series is required.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eEngineering \u0026amp; Installation Protocols\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eBattery Maintenance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-BA1\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ebattery should be replaced annually. If the \"BATT\" LED illuminates, you have approximately two weeks to replace the battery before the program in the volatile RAM is lost during a power cycle.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eFirmware Management:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eEnsure the firmware revision (e.g., v15 or v16) matches the version of RSLogix 5000 used for the project. Mismatched firmware will prevent the processor from entering \"Run\" mode.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eElectrostatic Discharge (ESD):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWhen handling the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-L55M14\u003c\/strong\u003e, particularly when installing or removing the M14 memory module, always use an ESD wrist strap. The internal CMOS circuits are highly sensitive to static and can be permanently damaged by invisible discharges.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eEngineering Advantages\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-L55M14\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eremains a critical component for\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003elegacy system maintenance\u003c\/strong\u003e. Its modular memory approach allows for easy upgrades; an \"M12\" processor can be upgraded to an \"M14\" simply by swapping the memory card. By supporting the full suite of Logix5000 instructions—including Sequential Function Charts (SFC) and Structured Text—it provides sophisticated control capabilities that were far ahead of its time. For facilities looking to maintain existing ControlLogix installations without the risk of a full-scale control system overhaul, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-L55M14\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eprovides the perfect balance of memory capacity and proven industrial reliability.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52695191814507,"sku":"1756-L55M14","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/allen-bradley-1756-l55m14-controller-processor-avfcaaudanc_6a814f6e-64a7-4ac1-a23b-7306659412a5.jpg?v=1766114662","url":"https:\/\/www.plcprotech.com\/fr\/products\/1756-l55m14-allen-bradley-controllogix-5555-processor-1-5-mb","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}