{"product_id":"1756-l1-allen-bradley-controllogix-logix5550-processor-module","title":"1756-L1 | Allen-Bradley | ControlLogix Logix5550 Processor Module","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1756-L1\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eserves as a foundational computing engine for the ControlLogix 5550 series. This processor module executes high-speed control instructions and manages I\/O data across the 1756 backplane. It provides 64 KB of user memory, specifically designed for localized machine control or distributed control nodes within a larger architecture. We supply this unit in\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New, original factory condition\u003c\/strong\u003e, ensuring your legacy systems benefit from zero-hour hardware and factory-sealed integrity.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\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\u003eUser Memory\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e64 KB\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCommunication Port\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eOne (1) RS-232 (9-pin D-shell)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMemory Expansion\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eSupports 1756-M1, 1756-M2, 1756-M3 Modules\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBattery Backup\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1756-BA1 or 1756-BA2 Lithium Battery\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\u003e120 mA\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\u003e2 mA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePower Dissipation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4.1 Watts (Max at 60 °C)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eIsolation Voltage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e30V Continuous\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\u003eSlot Width\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eSingle (1) Slot\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eEngineering Advantages\u003c\/h2\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDeterministic Instruction Execution:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 1756-L1 utilizes a dedicated multitasking operating system. It prioritizes critical control loops and ensures consistent scan times, which prevents jitter in sensitive motion or timing applications.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRS-232 Versatility:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe integrated RS-232 port supports multiple protocols, including DF1, DH-485, and ASCII. This allows direct connection to HMIs, weigh scales, or legacy SLC\/PLC-5 systems using the 1756-CP3 serial cable without requiring additional communication cards.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNon-Volatile Memory Expansion:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe processor features a physical slot for 1756-M series memory modules. Installing a 1756-M1 or M2 module protects your application code against battery failure and facilitates rapid program cloning across multiple machines.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eChassis-Based Scalability:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module fits into any slot of a ControlLogix chassis. This allows engineers to place multiple 1756-L1 processors in a single rack to segment control tasks—such as dedicated safety monitoring or complex data logging—independently of the main process controller.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRigid Thermal Management:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe open-style enclosure design optimizes natural convection airflow. It dissipates only 4.1 Watts of power, preventing localized hotspots within the chassis and extending the life of adjacent I\/O modules in high-density installations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFAQs\u003c\/h2\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I maintain the program memory during power loss?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 1756-L1 requires a lithium battery (1756-BA1 or 1756-BA2). We recommend installing a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eBrand New\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ebattery alongside this processor to ensure long-term data retention. Additionally, use a memory module (1756-M1\/M2\/M3) for non-volatile storage.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan this processor communicate over Ethernet?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 1756-L1 does not have an onboard Ethernet port. To connect to an EtherNet\/IP network, you must install a communication bridge module, such as a 1756-EN2T or 1756-ENBT, in the same chassis.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the maximum number of I\/O points the 1756-L1 can handle?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 64 KB memory limit defines the complexity of the code rather than a strict I\/O count. However, for large-scale distributed I\/O systems, consider upgrading to a 1756-L55 or L61 if your application program exceeds the 64 KB boundary.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIs this a refurbished or used unit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. We guarantee that this 1756-L1 is\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New\u003c\/strong\u003e. It ships in the original Allen-Bradley packaging with factory seals intact, protecting you from the reliability risks associated with surplus or used hardware.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":53132930842808,"sku":"1756-L1","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/1756-L11.jpg?v=1774606315","url":"https:\/\/www.globalpetroparts.com\/products\/1756-l1-allen-bradley-controllogix-logix5550-processor-module","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}