{"product_id":"allen-bradley-1756-l81ext-controllogix-xt-3mb-ethernet-controller","title":"Allen-Bradley 1756-L81EXT ControlLogix-XT 3MB Ethernet Controller","description":"\u003ch3\u003e\u003cstrong\u003e\u003cspan style=\"color: #0056b3;\"\u003eAllen-Bradley 1756-L81EXT ControlLogix-XT Controller Overview\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e\u003cspan style=\"color: #d9534f;\"\u003e1756-L81EXT\u003c\/span\u003e\u003c\/strong\u003e serves as a high-performance processor within the \u003cstrong\u003e\u003cspan style=\"color: #0056b3;\"\u003eControlLogix-XT\u003c\/span\u003e\u003c\/strong\u003e series. Engineers utilize this module for mission-critical automation in extreme environments. It features a rugged conformal coating to resist corrosion and humidity. This controller operates seamlessly between \u003cstrong\u003e-25°C and 70°C\u003c\/strong\u003e. We recommend \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/1756-L81EXT.pdf?v=1774939469\"\u003edownloading the official technical manual\u003c\/a\u003e and user datasheet for precise wiring diagrams. High-demand applications benefit from its superior thermal dissipation and integrated communication ports.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan style=\"color: #0056b3;\"\u003eTechnical Specifications\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e \u003cstrong\u003e\u003cspan style=\"color: #0056b3;\"\u003eAllen-Bradley \/ Rockwell Automation\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e \u003cstrong\u003e\u003cspan style=\"color: #d9534f;\"\u003e1756-L81EXT\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e \u003cstrong\u003e\u003cspan style=\"color: #0056b3;\"\u003eControlLogix-XT\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUser Memory:\u003c\/strong\u003e \u003cstrong\u003e3 MB\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommunication:\u003c\/strong\u003e \u003cstrong\u003e1 USB Port\u003c\/strong\u003e and \u003cstrong\u003e1 Embedded Ethernet Port\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eController Tasks:\u003c\/strong\u003e \u003cstrong\u003e32 Tasks\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrograms Per Task:\u003c\/strong\u003e \u003cstrong\u003e1000 Programs\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Draw (1.2V DC):\u003c\/strong\u003e \u003cstrong\u003e5 mA\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Draw (5.1V DC):\u003c\/strong\u003e \u003cstrong\u003e1.2 A\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Dissipation:\u003c\/strong\u003e \u003cstrong\u003e21.2 BTU\/hour\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e \u003cstrong\u003e-25°C to 70°C\u003c\/strong\u003e (Standalone)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironmental Resistance:\u003c\/strong\u003e \u003cstrong\u003eConformal Coating\u003c\/strong\u003e for harsh chemical protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterference Immunity:\u003c\/strong\u003e High electromagnetic compatibility (EMC) for industrial noise\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProgramming:\u003c\/strong\u003e Ladder Logic, Structured Text, Function Block, and SFC\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan style=\"color: #0056b3;\"\u003eInstallation and Compatibility\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Compatibility:\u003c\/strong\u003e Install the \u003cstrong\u003e\u003cspan style=\"color: #d9534f;\"\u003e1756-L81EXT\u003c\/span\u003e\u003c\/strong\u003e in standard or \u003cstrong\u003eXT\u003c\/strong\u003e chassis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUpgrading:\u003c\/strong\u003e Operators using \u003cstrong\u003eLXT\u003c\/strong\u003e chassis should upgrade to the \u003cstrong\u003eK version\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI\/O Support:\u003c\/strong\u003e The module supports unlimited local I\/O event triggers for rapid response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNetwork Integration:\u003c\/strong\u003e It works with \u003cstrong\u003eEtherNet\/IP\u003c\/strong\u003e, \u003cstrong\u003eDeviceNet\u003c\/strong\u003e, and \u003cstrong\u003eControlNet\u003c\/strong\u003e protocols.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlex I\/O Integration:\u003c\/strong\u003e Pair with \u003cstrong\u003eFlex I\/O-XT\u003c\/strong\u003e for consistent \u003cstrong\u003e-20°C to 70°C\u003c\/strong\u003e ratings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan style=\"color: #0056b3;\"\u003eGlobal PLC Spare HUB's Insight\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e\u003cspan style=\"color: #d9534f;\"\u003e1756-L81EXT\u003c\/span\u003e\u003c\/strong\u003e represents a significant leap for hardened automation. Unlike standard controllers, the \u003cstrong\u003eEXT\u003c\/strong\u003e designation ensures hardware longevity in salt-spray atmospheres. The \u003cstrong\u003e3 MB\u003c\/strong\u003e memory handles substantial logic code without sacrificing processing speed. We find the embedded Ethernet port simplifies architecture by removing extra bridge modules. This unit fits perfectly in outdoor control panels or non-climate-controlled floors.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan style=\"color: #0056b3;\"\u003eApplication and Diagnostics\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTypical Scenarios:\u003c\/strong\u003e Oil and Gas, Mining, Water Treatment, and Power Generation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiagnostic Ability:\u003c\/strong\u003e Integrated scrolling display provides real-time status and fault codes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReliability:\u003c\/strong\u003e Redundant path communication ensures continuous operation during network strain.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan style=\"color: #0056b3;\"\u003eShipping and Warranty\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDispatch Time:\u003c\/strong\u003e We ship all orders within \u003cstrong\u003e24-48 hours\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarrier Options:\u003c\/strong\u003e Worldwide delivery via \u003cstrong\u003eFedEx\u003c\/strong\u003e, \u003cstrong\u003eUPS\u003c\/strong\u003e, and \u003cstrong\u003eDHL\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty Terms:\u003c\/strong\u003e This product includes a \u003cstrong\u003e12-month warranty\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage List:\u003c\/strong\u003e One \u003cstrong\u003e\u003cspan style=\"color: #d9534f;\"\u003e1756-L81EXT\u003c\/span\u003e\u003c\/strong\u003e Controller and original protective industrial packaging.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan style=\"color: #0056b3;\"\u003eFrequently Asked Questions (FAQ)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eDoes the 1756-L81EXT require a battery for memory backup?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNo, this model utilizes energy storage modules to eliminate the need for lithium batteries.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eWhat is the benefit of the conformal coating on this specific module?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe coating prevents dendrite growth and leakage currents caused by tropical humidity.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCan I use standard 1756 I\/O modules with this XT controller?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eYes, but the system temperature rating will drop to the lowest-rated component limit.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eHow do I choose between the 1756-L81EXT and the standard 1756-L81?\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSelect the \u003cstrong\u003eEXT\u003c\/strong\u003e version if your cabinet temperature exceeds \u003cstrong\u003e60°C\u003c\/strong\u003e regularly.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan style=\"color: #0056b3;\"\u003ePurchasing Guide\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVerify your chassis series to ensure physical fitment and power supply overhead.\u003c\/li\u003e\n\u003cli\u003eConfirm your firmware revision requirements before integration into existing plants.\u003c\/li\u003e\n\u003cli\u003eCheck the environmental specs of your enclosure to utilize the \u003cstrong\u003eXT\u003c\/strong\u003e range.\u003c\/li\u003e\n\u003cli\u003eContact our technical team for bulk quantity discounts or expedited logistics.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":45013997617334,"sku":"1756-L81EXT","price":146.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/1756-L81EXT.jpg?v=1774940395","url":"https:\/\/www.plcsparehub.com\/products\/allen-bradley-1756-l81ext-controllogix-xt-3mb-ethernet-controller","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}