{"product_id":"allen-bradley-controllogix-1756-l1m2-1mb-logix5550-controller-processor-module","title":"Allen-Bradley ControlLogix 1756-L1M2 1MB Logix5550 Controller Processor Module","description":"\u003ch2\u003e\u003cstrong\u003eModule Overview\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-L1M2\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a foundational processor module within the Allen-Bradley ControlLogix 5550 series. Engineered for high-speed discrete and process control, this module features 1MB of expandable non-volatile memory, allowing for robust program storage and complex data handling. As a member of the 1756 chassis-based system, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-L1M2\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eleverages a producer-consumer communication model, which optimizes network bandwidth by allowing multiple nodes to consume the same data simultaneously. This processor is an ideal choice for legacy system maintenance and specialized industrial applications requiring a reliable, modular control engine.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eDetailed Engineering Specifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-L1M2\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003edraws minimal power from the backplane, ensuring thermal efficiency even in high-density chassis configurations.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eProcessor Type:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eLogix5550 Modular Controller\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eUser Memory:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1 Megabyte (Expandable)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eBackplane Current (5.1V DC):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e120 milliamps\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eBackplane Current (24V DC):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e2 milliamps\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePower Dissipation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e4.1 Watts maximum (@ 60°C)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIsolation Voltage:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e30V Continuous (Basic Insulation Type)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOperating Current (Min):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e2 milliamps @ 10V DC\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOperating Current (Max):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e3.5 milliamps @ 30V DC\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOff-State Input Current (Max):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1.5 milliamps\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e0°C to 60°C (32°F to 140°F)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eStorage Temperature:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e-40°C to 85°C (-40°F to 185°F)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eVibration Resistance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e2G @ 10 to 500 Hz\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePhysical Weight:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e0.81 lbs (0.37 kg)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSlot Width:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSingle-slot occupancy\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eMemory Management and Expansion\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eA key feature of the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-L1M2\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis its modular memory architecture. The 1MB of onboard memory can be supplemented with 1756-M1, -M2, or -M3 expansion memory modules to accommodate larger rungs of ladder logic or extensive tag databases. To ensure data integrity during power cycles, the processor utilizes a lithium battery (typically the 1756-BA1) to maintain the volatile RAM. For permanent backup, the user program can be saved to non-volatile storage, protecting the system against long-term power loss in remote environments.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eSystem Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-L1M2\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis compatible with all standard 1756 ControlLogix chassis (e.g., 1756-A4, -A7, -A10) and can be placed in any available slot. It integrates seamlessly with a wide range of communication modules, including EtherNet\/IP (1756-ENBT), ControlNet (1756-CNB), and DeviceNet (1756-DNB). Programming and configuration are handled through RSLogix 5000 software, supporting Ladder Diagram (LD), Structured Text (ST), and Function Block Diagram (FBD) languages.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eTechnical FAQ\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan the 1756-L1M2 be used in a redundant controller setup?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 5550 series processors like the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-L1M2\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003egenerally do not support the high-speed redundancy sync required for modern bumpless transfer. For redundancy applications, the 1756-L6x or L7x series is recommended.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat happens if the battery fails on this module?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIf the battery (1756-BA1) is depleted and the chassis loses power, the volatile user program and tag data will be lost. It is critical to monitor the \"BATT\" LED on the front of the processor and replace the battery while the rack is powered to preserve memory.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this processor compatible with Studio 5000?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-L1M2\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a legacy controller primarily supported by RSLogix 5000 (Versions 10 through 13). Newer versions of Studio 5000 generally target the L7 and L8 hardware generations.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52457683058997,"sku":"1756-L1M2","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/1756-L1M2.jpg?v=1773986921","url":"https:\/\/www.5gplc.com\/products\/allen-bradley-controllogix-1756-l1m2-1mb-logix5550-controller-processor-module","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}