{"product_id":"ab-1785-l30b-plc-5-controller-1024-i-o-dh-remote-i-o","title":"AB 1785-L30B PLC-5 Controller 1024 I\/O DH+ Remote I\/O","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1785-L30B\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efunctions as the central intelligence for the PLC-5\/30 control system. This standard processor module executes complex ladder logic programs and manages high-density I\/O configurations across the 1771 platform. It integrates multiple communication protocols, including Data Highway Plus (DH+) and Remote I\/O, allowing for seamless data exchange between controllers and peripheral devices. With 32K words of static RAM (SRAM) and a robust instruction set, the 1785-L30B provides the computational power required for large-scale, time-critical industrial processes.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eWe offer this unit as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New and Factory Sealed\u003c\/strong\u003e, ensuring the highest level of component integrity for your legacy infrastructure.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDetails\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\u003eProcessor Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePLC-5\/30 Standard Processor\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\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\u003e32K Words SRAM\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMax I\/O Capacity\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1,024 Total I\/O (Analog or Digital)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackplane Current\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2.3 Amps at 5V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCommunication Ports\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2 DH+ \/ Remote I\/O Channels; 1 RS-232C Port\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eTypical Scan Time\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.5 ms per 1K Word (Logic only)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eProgramming\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eLadder Logic with PID and Math Functions\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMemory Retention\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eLithium Battery for SRAM backup\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 60 degrees C (32 to 140 degrees F)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eStatus Indicators\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eProcessor Run, Force, Battery, and Comm LEDs\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\u003cp\u003eThe 1785-L30B resolves significant operational and architectural challenges in mature automation environments:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eExpanded Network Architecture:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDual DH+\/Remote I\/O channels allow the processor to function simultaneously as a network node and a scanner. This dual-purpose capability facilitates communication with human-machine interfaces (HMIs) while controlling distributed I\/O racks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eComplex Process Control:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe processor supports an advanced instruction set including PID loops and floating-point math. This enables precise regulation of temperature, pressure, and flow in chemical, pharmaceutical, and water treatment applications.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHardware-Level Reliability:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 1785-L30B utilizes industrial-grade SRAM with battery backup. This prevents program loss during unexpected power cycles, ensuring the system resumes operation immediately upon power restoration without requiring a manual reload.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eLegacy Continuity:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAs a direct replacement for older 1785-series processors, the L30B allows plants to maintain existing 1771 I\/O investments. It fits directly into any standard 1771 universal I\/O chassis, eliminating the need for costly cabinet rewiring or hardware redesign.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the 1785-L30B support memory expansion?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. You can install an optional EEPROM module to provide non-volatile program storage. This ensures the processor can reload the application automatically if the backup battery fails during a power outage.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use the RS-232 port for peer-to-peer networking?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe RS-232C port typically serves as a programming port or for connection to point-to-point devices like barcode scanners or serial printers. For networking between controllers, use the dedicated DH+ channels.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the \"Low Battery\" indicator's behavior?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe \"BATT\" LED illuminates when the internal lithium battery voltage drops below a safe threshold. You should replace the battery while the processor is powered up to prevent losing the program currently stored in the SRAM.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this processor compatible with all 1771 chassis?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 1785-L30B must occupy the leftmost slot (Slot 0) of a 1771 universal I\/O chassis. It works with all standard 1771-A1B through 1771-A4B chassis assemblies.\u003c\/p\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":43377942921306,"sku":"1785-L30B","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/25_67c235d6-62e6-4c86-aea0-98f76e65b282.jpg?v=1778813553","url":"https:\/\/www.spareoil.com\/products\/ab-1785-l30b-plc-5-controller-1024-i-o-dh-remote-i-o","provider":"SpareOil Automation","version":"1.0","type":"link"}