{"product_id":"allen-bradley-1785-l80b-e-plc-5-80-processor-module","title":"Allen-Bradley 1785-L80B\/E PLC-5\/80 Processor Module","description":"\u003ch2\u003eAllen-Bradley 1785-L80B\/E PLC-5\/80 Processor Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for high-density I\/O handling and real-time execution in 1771 chassis architecture, the \u003cstrong\u003eAllen-Bradley 1785-L80B\/E\u003c\/strong\u003e (\u003cstrong\u003e1785-L80B\u003c\/strong\u003e Processor Module) provides direct physical\/electrical execution across Data Highway Plus (DH+) and Remote I\/O network topologies.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e1785-L80B\/E\u003c\/strong\u003e designation breaks down into precise physical and architectural characteristics within the PLC-5\/80 family:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1785\u003c\/strong\u003e: Base bulleted product line identifier for Allen-Bradley PLC-5 chassis-based processor modules.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eL80\u003c\/strong\u003e: Processor capacity tier (PLC-5\/80 class), establishing support for up to 100K words of SRAM memory and up to 3,072 total I\/O capacity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eB\u003c\/strong\u003e: Hardware Series revision code, defining the physical component layout and backplane interface circuitry.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\/E\u003c\/strong\u003e: Firmware Revision level, governing internal system executive code, instruction timing execution, and firmware flash compatibility across backplane configurations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\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-L80B\/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\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 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e12 to 17.3 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUser Memory\u003c\/td\u003e\n\u003ctd\u003e100K words SRAM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax I\/O Capacity\u003c\/td\u003e\n\u003ctd\u003e3072 points\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Ports\u003c\/td\u003e\n\u003ctd\u003e4 DH+\/Remote I\/O channels (1A, 1B, 2A, 2B), 1 RS-232\/422\/423 serial port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current Load\u003c\/td\u003e\n\u003ctd\u003e2.3 to 3.3 A at 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Scan Time per Rack\u003c\/td\u003e\n\u003ctd\u003e10 ms at 57.6 kbit\/s, 7 ms at 115.2 kbit\/s, 3 ms at 230.4 kbit\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax I\/O Chassis Racks\u003c\/td\u003e\n\u003ctd\u003eUp to 93 chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery Backup\u003c\/td\u003e\n\u003ctd\u003e1770-XYC or 1785-BATM lithium battery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus Communication Velocity \u0026amp; Network Integrity\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e1785-L80B\/E\u003c\/strong\u003e integrates directly with the 1771 backplane bus, drawing 2.3 to 3.3 A at 5 VDC to power its internal processing logic and channel drivers. The module utilizes deterministic backplane scan loops to update discrete and analog input data structures. Network transaction latency on Remote I\/O links scales dynamically with node configuration and baud rates, achieving scan times of 3 ms at 230.4 kbit\/s per rack. Communication channels (1A, 1B, 2A, 2B) support hardware-level protocol conversion and isolated signal paths to ensure deterministic network bandwidth allocation without degrading CPU execution cycles.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What is the backplane current draw for the 1785-L80B\/E module?\u003c\/p\u003e\n\u003cp\u003eA: The processor draws between 2.3 A and 3.3 A at 5 VDC from the 1771 chassis power supply backplane.\u003c\/p\u003e\n\u003cp\u003eQ: Can the 1785-L80B\/E processor be inserted or removed under power?\u003c\/p\u003e\n\u003cp\u003eA: No, the 1771 chassis backplane does not support hot-swapping for processor modules. Power to the chassis must be removed before installation or removal to prevent backplane damage or unpredicted system state trips.\u003c\/p\u003e\n\u003cp\u003eQ: How is user memory retained during a power interruption?\u003c\/p\u003e\n\u003cp\u003eA: Internal SRAM memory retention during power-down states requires an installed 1770-XYC or 1785-BATM lithium battery connected to the front-panel battery leads.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Powering\u003c\/strong\u003e: Verify that the 1771 system chassis power supply is completely de-energized before inserting the module into the left-most controller slot.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding \u0026amp; Shielding\u003c\/strong\u003e: Ensure the 1771 chassis enclosure is connected to the master ground bus with a minimum 8 AWG copper conductor. Terminate DH+ and Remote I\/O cable shields at one end only to prevent ground loop currents.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring Clearance\u003c\/strong\u003e: Maintain a minimum 2-inch clearance between signal\/communication wiring (DH+, RS-232) and high-voltage AC power lines to suppress electromagnetic interference.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery Connection\u003c\/strong\u003e: Key the lithium battery plug into the module connector prior to final rack mounting to ensure SRAM retention during initial commissioning tests.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43748473700442,"sku":"1785-L80B\/E","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1785-L80BE2.jpg?v=1785231620","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1785-l80b-e-plc-5-80-processor-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}