{"product_id":"allen-bradley-1785-l20e-plc-5-ethernet-processor-module","title":"Allen-Bradley 1785-L20E PLC-5 Ethernet Processor Module","description":"\u003ch3\u003e\u003cstrong\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Allen-Bradley\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1785-L20E\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a PLC-5\/20E processor module developed for mid-range programmable logic controller applications requiring integrated Ethernet connectivity and multi-network communication capability.\u003c\/p\u003e\n\u003cp\u003eManufactured by\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003eAllen-Bradley\u003c\/span\u003e, this processor belongs to the PLC-5 family and is designed for systems where both legacy DH+ networks and Ethernet-based communication must coexist within a single controller architecture.\u003c\/p\u003e\n\u003cp\u003eIt provides a balance of moderate memory capacity, flexible I\/O handling, and multiple embedded communication ports, making it suitable for distributed control and plant-wide integration tasks.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eCore System Capabilities\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1785-L20E\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eprocessor integrates multiple communication pathways and supports hybrid control system architectures:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eBuilt-in Ethernet communication for modern network integration\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDH+ fixed channel for legacy PLC-5 network compatibility\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eRemote I\/O interface supporting adapter or scanner modes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eConfigurable serial port supporting RS-232, RS-422A, and RS-423 standards\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eBattery-backed SRAM for program retention\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEEPROM backup compatibility for program storage expansion\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\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 Number\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e1785-L20E\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePLC-5 \/ 20E\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eProgrammable Logic Controller Processor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUser Memory\u003c\/td\u003e\n\u003ctd\u003e16K Words SRAM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMemory Backup\u003c\/td\u003e\n\u003ctd\u003eBattery-backed static RAM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEEPROM Support\u003c\/td\u003e\n\u003ctd\u003eYes (1785-ME series modules)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum I\/O Capacity\u003c\/td\u003e\n\u003ctd\u003e512 total or 512 IN + 512 OUT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog I\/O Capacity\u003c\/td\u003e\n\u003ctd\u003eUp to 512 points\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRemote I\/O Support\u003c\/td\u003e\n\u003ctd\u003eUp to 12 chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal I\/O Chassis\u003c\/td\u003e\n\u003ctd\u003eUp to 13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUniversal Remote Chassis\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLocal Chassis Expansion\u003c\/td\u003e\n\u003ctd\u003eNot supported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEmbedded Ethernet\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDH+ Channels\u003c\/td\u003e\n\u003ctd\u003e1 fixed + 1 configurable DH+\/RIO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSerial Interface\u003c\/td\u003e\n\u003ctd\u003e1 port (RS-232 \/ RS-422A \/ RS-423 selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e2.3 A @ 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Dissipation\u003c\/td\u003e\n\u003ctd\u003e12 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage System\u003c\/td\u003e\n\u003ctd\u003e5 VDC backplane powered\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Power Supplies\u003c\/td\u003e\n\u003ctd\u003e1771-P4S \/ P6S \/ P4S1 \/ P6S1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessor Type\u003c\/td\u003e\n\u003ctd\u003ePLC-5\/20E\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0°C to 60°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40°C to 85°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3.1 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eCommunication Architecture\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1785-L20E\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eprovides multi-layer communication support:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eEthernet interface for modern SCADA and HMI integration\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDH+ network compatibility for legacy PLC systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eRemote I\/O scanning and adapter capability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSerial communication for device-level integration\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis mixed architecture allows gradual migration from legacy PLC-5 systems toward Ethernet-based industrial networks without full system replacement.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTypical Applications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eManufacturing line control systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProcess automation facilities\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eLegacy PLC-5 system upgrades\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDistributed remote I\/O architectures\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMaterial handling systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWater and wastewater treatment plants\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIndustrial communication bridging projects\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs the 1785-L20E compatible with Ethernet networks?\u003c\/strong\u003e\u003cbr\u003eYes, it includes integrated Ethernet communication for modern industrial networking.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this processor operate in a legacy PLC-5 system?\u003c\/strong\u003e\u003cbr\u003eYes, it is fully compatible with PLC-5 architectures and DH+ networks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the maximum I\/O capacity?\u003c\/strong\u003e\u003cbr\u003eUp to 512 total I\/O points or 512 inputs plus 512 outputs in complementary mode.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it support remote I\/O expansion?\u003c\/strong\u003e\u003cbr\u003eYes, up to 12 remote I\/O chassis are supported.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43345649762394,"sku":"1785-L20E\/E","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1785-L20EE2.jpg?v=1778469837","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1785-l20e-plc-5-ethernet-processor-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}