{"product_id":"1785-lt-rockwell-automation-plc-5-15-cpu-module-brand-new","title":"1785-LT Rockwell Automation PLC-5\/15 CPU Module Brand New","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1785-LT\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efunctions as the central intelligence for PLC-5\/15 Classic control systems. This processor executes complex ladder logic, manages floating-point math, and coordinates high-speed I\/O communication across the 1771 Universal I\/O platform. Despite its legacy status, the 1785-LT remains a critical component for maintaining existing infrastructure in automotive, food and beverage, and material handling sectors. We provide this unit as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New and Original\u003c\/strong\u003e, ensuring your facility secures a reliable, high-performance replacement for aging or failed CPUs.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThe 1785-LT balances memory capacity with robust communication protocols to handle localized and distributed control tasks.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eAttribute\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification Details\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eProcessor Type\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePLC-5\/15 Classic\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eUser Memory\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e6K Words SRAM (Expandable to 14K)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eI\/O Capacity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e512 Total I\/O (512 In + 512 Out)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eScan Time\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2 ms per K Word (Bit Logic)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBuilt-in Channels\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eOne DH+ Channel; One Remote I\/O Scanner\/Adapter\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eMemory Modules\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eSupports 1785-MR, 1785-MS, 1785-MJ\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBattery Backup\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1770-XY Lithium Battery\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBackplane Current\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2.5 Amp at 5 VDC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eOperating Temp\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\u003eChassis Placement\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1771-I\/O Chassis, Left-Most Slot\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\u003eMulti-Protocol Communication:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 1785-LT integrates both Data Highway Plus (DH+) and Remote I\/O (RIO) on a single standalone scanner. This architecture allows the processor to act as a local controller while simultaneously broadcasting data to an HMI or supervisory PLC across the plant floor.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eExpansion Ready:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWhile the base unit features 6K words of SRAM, engineers can expand this to 14K words using 1785-MR or 1785-MS modules. For permanent program security, the 1785-MJ EEPROM module prevents data loss even during long-term power outages.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eAdvanced Addressing Modes:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThis CPU supports 2-slot, 1-slot, and 1\/2-slot I\/O addressing. This flexibility enables high-density 32-point I\/O module integration without requiring a total overhaul of the chassis layout.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRugged Reliability:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBuilt for 24\/7 industrial cycles, the processor handles scan times of approximately 8ms for typical programs. Its convection-cooled design requires no internal fans, reducing mechanical failure points in dusty or oily environments.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can the 1785-LT replace a 1785-LTB or 1785-LT Series B?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Yes. The 1785-LT is functionally interchangeable with the LTB variant. Ensure you verify the firmware version and hardware keying (located between pins 40-42 and 54-56) before inserting the new processor into your existing 1771 chassis.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the primary indicator of a low battery on this processor?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The \"BATT\" LED on the front panel illuminates red when the 1770-XY lithium battery voltage drops below a safe threshold. You should replace the battery while the processor remains powered on to prevent the SRAM memory from clearing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this processor support Ethernet communication?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: No. The 1785-LT lacks a native Ethernet port. To connect this processor to an Ethernet\/IP network, you must utilize a sidecar module or a communication bridge like the 1761-NET-ENI or a ProSoft gateway.\u003c\/p\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":43378202050650,"sku":"1785-LT","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/31_3981648a-1c36-4e98-a460-ca4e796b8f4f.jpg?v=1778816732","url":"https:\/\/www.spareoil.com\/products\/1785-lt-rockwell-automation-plc-5-15-cpu-module-brand-new","provider":"SpareOil Automation","version":"1.0","type":"link"}