{"product_id":"allen-bradley-1785-l20e-plc-5-ethernet-processor-module-1","title":"Allen-Bradley 1785-L20E PLC-5 Ethernet Processor Module","description":"\u003ch2\u003eAllen-Bradley 1785-L20E PLC-5 Ethernet Processor Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1785-L20E\u003c\/strong\u003e serves as the primary \u003cstrong\u003e1785-L20E\u003c\/strong\u003e PLC-5 Ethernet Processor Module utilized to execute logic processing, I\/O scanning, and network communication across PLC-5 controller platforms. The module provides embedded Ethernet, DH+, Remote I\/O, and serial communication interfaces through the 1771 I\/O chassis backplane.\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-L20E\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\u003eStandard 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\u003e3.11 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\u003e12 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e2.3 A\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\u003eUser Memory\u003c\/td\u003e\n\u003ctd\u003e16 Kwords Battery-Backed SRAM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEmbedded Communication Interfaces\u003c\/td\u003e\n\u003ctd\u003e1 x DH+ fixed, 1 x DH+\/Remote I\/O adapter or scanner, 1 x configurable RS-232\/422A\/423 serial port, Ethernet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEthernet Communication\u003c\/td\u003e\n\u003ctd\u003eEmbedded TCP\/IP and EtherNet\/IP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum I\/O Capacity\u003c\/td\u003e\n\u003ctd\u003e512 points any mix or 512 inputs + 512 outputs complementary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Analog I\/O\u003c\/td\u003e\n\u003ctd\u003e512\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRemote I\/O Capacity\u003c\/td\u003e\n\u003ctd\u003e12 chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum I\/O Racks\u003c\/td\u003e\n\u003ctd\u003e4 (0-3)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Total I\/O Chassis\u003c\/td\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery\u003c\/td\u003e\n\u003ctd\u003e1770-XYC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEEPROM Backup Support\u003c\/td\u003e\n\u003ctd\u003eCompatible with 1785-ME16, 1785-ME32, 1785-ME64, and 1785-M100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply Compatibility\u003c\/td\u003e\n\u003ctd\u003e1771-P4S, 1771-P6S, 1771-P4S1, 1771-P6S1\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 kbits\/s, 7 ms at 115.2 kbits\/s, 3 ms at 230.4 kbits\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 deg C to 85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eEtherNet\/IP and PLC-5 Processor Communication Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe 1785-L20E integrates PLC-5 processor execution with embedded Ethernet communication capability. The processor manages application logic, local and remote I\/O operations, and communication exchange through DH+, Remote I\/O, serial interfaces, and Ethernet networks.\u003c\/p\u003e\n\u003cp\u003eFor Allen-Bradley PLC architecture, the module uses backplane bus communication for interaction with 1771 I\/O chassis components. The processor supports I\/O density scaling through extended remote chassis configurations and provides firmware compatibility within the PLC-5 Ethernet processor family.\u003c\/p\u003e\n\u003cp\u003eThe embedded Ethernet interface supports TCP\/IP communication and EtherNet\/IP data exchange. Communication channel configuration requires verification of processor firmware revision, network parameters, and connected I\/O architecture before system operation.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What Ethernet communication capability is integrated into the 1785-L20E?\u003cbr\u003eA: The 1785-L20E includes an embedded Ethernet communication interface supporting TCP\/IP and EtherNet\/IP communication.\u003c\/p\u003e\n\u003cp\u003eQ: What memory configuration is available on the 1785-L20E processor?\u003cbr\u003eA: The processor provides 16 Kwords of battery-backed SRAM user memory and supports EEPROM program backup through compatible memory modules.\u003c\/p\u003e\n\u003cp\u003eQ: How is the processor installed within a PLC-5 system?\u003cbr\u003eA: The module is installed in a compatible 1771 I\/O chassis and receives operating power through the chassis backplane connection.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1785-L20E processor module into the assigned 1771 I\/O chassis slot and confirm proper backplane connector engagement before applying system power. Verify compatibility between processor firmware revision, I\/O modules, power supply type, and communication devices.\u003c\/p\u003e\n\u003cp\u003eConnect Ethernet, DH+, Remote I\/O, and serial communication wiring according to PLC-5 installation requirements. Route communication cables separately from high-voltage conductors and maintain appropriate cable shielding and grounding practices.\u003c\/p\u003e\n\u003cp\u003eVerify battery installation, chassis power availability, and processor diagnostic indicators during commissioning. Confirm Ethernet\/IP configuration, I\/O addressing, and communication channel settings before placing the PLC-5 controller into operation.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43739313471578,"sku":"1785-L20E","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1785-L20E2.jpg?v=1785139199","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1785-l20e-plc-5-ethernet-processor-module-1","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}