{"product_id":"allen-bradley-1756-m3-controllogix-2mb-expansion-memory-module","title":"Allen-Bradley 1756-M3 ControlLogix 2MB Expansion Memory Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-M3\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efunctions as a high-speed volatile expansion memory module specifically engineered for the Allen-Bradley ControlLogix 5555 (L55) controller series. It expands the user memory by\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e2 Megabytes\u003c\/strong\u003e, providing the necessary overhead for extensive ladder logic programs, complex tag databases, and data logging requirements. This module integrates directly onto the processor daughtercard slot, enabling immediate capacity upgrades without replacing the entire CPU. We supply this unit as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New and factory-original\u003c\/strong\u003e, ensuring maximum data retention integrity and timing precision for your legacy automation infrastructure.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThe 1756-M3 utilizes high-performance memory architecture to maintain rapid instruction execution speeds across the ControlLogix backplane.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eFeature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\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\u003eMemory Capacity\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2 Megabytes (MB)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModule Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eExpansion Memory (Volatile)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.56 lbs (0.26 kg)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 60 °C (32 to 140 °F)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eVibration Tolerance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2 G @ 10 to 500 Hz\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Shock\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e30 G\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eRelative Humidity\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e5 to 95% (Non-condensing)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eTemperature Code\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eT4A\/T4 (IEC)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eEnclosure\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eOpen-style\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eInstant Logic Expansion:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 1756-M3 solves the common industrial bottleneck of \"Memory Full\" errors in aging L55 systems. By adding 2MB of dedicated space, it allows engineers to implement additional safety routines or communication rungs without optimizing or deleting existing critical code.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Vibration Resilience:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDesigned for the plant floor, this module withstands shocks up to 30G and continuous vibration up to 2G. These specifications ensure the memory seat remains secure even when installed in cabinets mounted directly on high-impact machinery like stamping presses or industrial mixers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eThermal Stability:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module supports a full industrial operating range up to 60 °C. The open-style enclosure maximizes airflow from the chassis fans, preventing localized hot spots that could lead to data corruption or processor faults.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eZero-Latency Integration:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBecause the 1756-M3 plugs directly into the processor's internal bus, it adds capacity without introducing the latency associated with remote storage or external communication links. The controller accesses the expanded memory at the same speed as the base onboard RAM.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhich processors support the 1756-M3 expansion module?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis module primarily fits the 1756-L55 (ControlLogix 5555) series. Later models like the L6x, L7x, and L8x series use integrated non-volatile memory or different expansion architectures and do not utilize the M3 module.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIs this module 100% Brand New or a refurbished \"pull\"?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWe guarantee this unit is\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ein original factory packaging. Unlike used memory modules that may have suffered electrostatic discharge (ESD) damage during improper handling, our new stock ensures clean electrical contacts and full component lifespan.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need to backup my program before installing the 1756-M3?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. Installing the memory module requires removing the processor from the chassis and potentially clearing existing memory. Always upload and save your project in RSLogix 5000 before hardware installation to prevent data loss.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I verify the module is working after installation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOnce installed and powered up, open the \"Controller Properties\" in your programming software. The \"Memory\" tab will reflect the total expanded capacity, confirming the processor has successfully initialized the 2MB expansion.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52847364931893,"sku":"1756-M3","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/1756-M3.png?v=1778221880","url":"https:\/\/www.5gplc.com\/products\/allen-bradley-1756-m3-controllogix-2mb-expansion-memory-module","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}