{"product_id":"allen-bradley-1785-l11b-e-plc-5-processor-module","title":"Allen-Bradley 1785-L11B\/E PLC-5 Processor Module","description":"\u003ch2\u003eAllen-Bradley 1785-L11B\/E PLC-5 Processor Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1785-L11B\/E\u003c\/strong\u003e serves as the primary \u003cstrong\u003e1785-L11B\u003c\/strong\u003e PLC-5 Processor Module utilized to execute logic processing, I\/O coordination, and communication management across PLC-5 controller platforms. The module provides processor control through a 1771 I\/O chassis backplane with DH+, RS-232, and Remote I\/O communication interfaces.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1785-L11B\/E\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003ePLC-5 Processor Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Line\u003c\/td\u003e\n\u003ctd\u003ePLC-5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3.00 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 deg C to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e2.3 A at 5 VDC backplane current\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUser Memory\u003c\/td\u003e\n\u003ctd\u003e1K words battery-backed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessor Type\u003c\/td\u003e\n\u003ctd\u003ePLC-5\/11 Standard Processor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Ports\u003c\/td\u003e\n\u003ctd\u003e1 x RS-232, 1 x DH+, 1 x Remote I\/O scanner\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum I\/O Capacity\u003c\/td\u003e\n\u003ctd\u003e512 points\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChassis Compatibility\u003c\/td\u003e\n\u003ctd\u003e1771 I\/O chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery Type\u003c\/td\u003e\n\u003ctd\u003eLithium battery for memory retention\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Scan Time\u003c\/td\u003e\n\u003ctd\u003e10 ms at 57.6 kbps, 7 ms at 115.2 kbps, 3 ms at 230.4 kbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStatus Indicators\u003c\/td\u003e\n\u003ctd\u003ePower, fault, and communication LEDs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003ePLC-5 Processor Backplane and Communication Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe 1785-L11B\/E processor module performs PLC-5 control execution through the 1771 chassis backplane interface. The processor manages user program execution, local and remote I\/O scanning, and communication exchange through DH+, RS-232, and Remote I\/O channels.\u003c\/p\u003e\n\u003cp\u003eFor Allen-Bradley PLC architecture, the module operation depends on backplane bus communication behavior and processor firmware compatibility. The processor supports I\/O density scaling within PLC-5 system limits and maintains program storage through battery-backed memory.\u003c\/p\u003e\n\u003cp\u003eThe module supports legacy deterministic networks through DH+ and Remote I\/O communication paths. Firmware flash compatibility and processor revision matching are required when integrating the module into existing PLC-5 configurations.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What communication interfaces are available on the 1785-L11B\/E processor module?\u003cbr\u003eA: The module provides one RS-232 serial interface, one Data Highway Plus (DH+) interface, and one Remote I\/O scanner interface.\u003c\/p\u003e\n\u003cp\u003eQ: How is the user program retained during power loss?\u003cbr\u003eA: The processor uses battery-backed memory with a lithium battery to maintain stored user program data.\u003c\/p\u003e\n\u003cp\u003eQ: What chassis is required for installation of the 1785-L11B\/E?\u003cbr\u003eA: The processor module is installed in a compatible 1771 I\/O chassis and receives operating power through the chassis backplane.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1785-L11B\/E processor module into the designated 1771 I\/O chassis slot and verify proper backplane connector engagement before applying system power. Confirm processor revision compatibility with connected PLC-5 modules and communication devices.\u003c\/p\u003e\n\u003cp\u003eConnect DH+, RS-232, and Remote I\/O wiring according to the PLC-5 installation requirements. Route communication cables separately from high-voltage power conductors and apply proper shield grounding practices to reduce electromagnetic interference.\u003c\/p\u003e\n\u003cp\u003eVerify battery condition, chassis power availability, and processor status LEDs during commissioning. Confirm I\/O addressing, communication configuration, and user program operation before placing the controller system into service.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43738931101786,"sku":"1785-L11B\/E","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1785-L11BE2.jpg?v=1785136959","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1785-l11b-e-plc-5-processor-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}