{"product_id":"1785-l40l-allen-bradley-plc-5-processor-module-buy-online","title":"1785-L40L Allen-Bradley PLC-5 Processor Module | Buy Online","description":"\u003cdiv\u003e\n  \u003ch3\u003eProduct Overview \u0026amp; Architecture\u003c\/h3\u003e\n  \u003cp\u003eThe \u003cstrong\u003e1785-L40L\u003c\/strong\u003e is a high-capacity PLC-5\/40L standard controller engineered by Rockwell Automation (Allen-Bradley) to manage complex industrial automation frameworks. Built with an integrated extended local I\/O link port, this processor coordinates thousands of field input and output devices with high reliability. It features 48 kilowords of user memory, battery-backed static RAM, and optional EEPROM backup support. Designed to occupy the leftmost slot of a standard 1771 I\/O chassis, the controller efficiently handles up to 2048 total I\/O points while drawing 3.3 Amps of backplane current at 5 VDC.\u003c\/p\u003e\n\n  \u003ch3\u003eGlobal PLC Spare HUB's Insight\u003c\/h3\u003e\n  \u003cp\u003eIn legacy discrete and continuous manufacturing plants, the stability of the core control processor determines overall facility uptime. During a recent modernization project for an automated material handling line, our engineering team deployed the \u003cstrong\u003e1785-L40L\u003c\/strong\u003e controller to replace an aging unit without requiring a complete cabinet redesign. The extended local I\/O capability allowed us to seamlessly link remote chassis configurations across a massive physical footprint. Furthermore, the built-in Data Highway Plus (DH+) and Remote I\/O communication ports simplified network integration with existing operator interfaces, while the clear status LED indicators and robust diagnostic routines allowed our technicians to isolate communication bottlenecks in minutes.\u003c\/p\u003e\n\n  \u003ch3\u003eCore Technical Specifications\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eManufacturer \u0026amp; Brand:\u003c\/strong\u003e Rockwell Automation \/ Allen-Bradley\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eProduct Series:\u003c\/strong\u003e PLC-5 Programmable Controller Family\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePart Number \/ Catalog No.:\u003c\/strong\u003e \u003cstrong\u003e1785-L40L\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eModule Type:\u003c\/strong\u003e Standard Processor Unit (PLC-5\/40L)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMax User Memory:\u003c\/strong\u003e 48 Kilowords (Static RAM with battery backup)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eProgram Backup Support:\u003c\/strong\u003e Compatible with 1785-ME16, -ME32, -ME64, and -M100 EEPROM modules\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMax I\/O Capacity:\u003c\/strong\u003e Up to 2048 total I\/O points (any mix) or 2048 in + 2048 out (complementary)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eChassis \u0026amp; Rack Limits:\u003c\/strong\u003e Supports up to 61 total I\/O chassis, 16 extended local chassis, and 32 universal remote chassis per link\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCommunication Ports:\u003c\/strong\u003e One (1) RS-232-C\/422-A\/423-A port, plus double DH+ \/ Remote I\/O communication links\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBackplane Power Draw:\u003c\/strong\u003e 3.3 Amperes nominal at +5 VDC (dissipates approximately 17 Watts of thermal energy)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePhysical \u0026amp; Environmental:\u003c\/strong\u003e Weighs 1.42 kg, open enclosure design, operating temperature range of 0 degrees Celsius to 60 degrees Celsius (32 degrees Fahrenheit to 140 degrees Fahrenheit)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eDeployment \u0026amp; Installation Guidelines\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSlot Placement:\u003c\/strong\u003e Always mount the \u003cstrong\u003e1785-L40L\u003c\/strong\u003e processor securely in the designated leftmost slot of the primary 1771 I\/O chassis rack.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAddressing Modes:\u003c\/strong\u003e Configure your module I\/O mapping using half-slot, single-slot, or double-slot addressing parameters depending on your connected 8-point, 16-point, or 32-point Bulletin 1771, 1794, or 1746 modules.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePower Isolation:\u003c\/strong\u003e Ensure all chassis power is completely cut off before installation to prevent electrical surges across the 5 VDC backplane pins.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCommunication Setup:\u003c\/strong\u003e Configure the dual DH+ \/ Remote I\/O port switches to operate either as a Remote I\/O Adapter or an active Scanner node based on your network architecture.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eDiagnostics \u0026amp; Troubleshooting Framework\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eProcessor Status Indicators:\u003c\/strong\u003e Monitor front-panel LED indicators to verify processor run-mode, battery health status, and forced I\/O conditions.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCommunication Isolation:\u003c\/strong\u003e Verify that isolation voltage thresholds (tested at 500V and 1000V for 60 seconds between communication ports and relay cartridges) remain uncompromised during periodic maintenance.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eThermal Monitoring:\u003c\/strong\u003e Ensure adequate cabinet airflow to keep operating temperatures within the 0 degrees Celsius to 60 degrees Celsius threshold, avoiding heat dissipation faults (17W).\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eTarget Hardware \u0026amp; Application Environments\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCompatible Equipment:\u003c\/strong\u003e Allen-Bradley 1771 I\/O chassis racks, Bulletin 1771\/1794\/1746\/1791 I\/O modules, and 1785-RC relay cartridges.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eApplication Sectors:\u003c\/strong\u003e Heavy automotive assembly lines, large-scale water treatment pumping stations, mineral processing plants, and discrete packaging systems.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNetwork Integration:\u003c\/strong\u003e Ideal for legacy plants utilizing Data Highway Plus (DH+) networks and remote I\/O data highway drops.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eWarranty \u0026amp; Global Logistics\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWarranty Protection:\u003c\/strong\u003e Fully backed by a comprehensive \u003cstrong\u003e12-month warranty\u003c\/strong\u003e covering structural hardware integrity and operational performance.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eExpress Shipping Carriers:\u003c\/strong\u003e Dispatched worldwide through reliable Tier-1 logistics providers including \u003cstrong\u003eFedEx\u003c\/strong\u003e, \u003cstrong\u003eUPS\u003c\/strong\u003e, and \u003cstrong\u003eDHL\u003c\/strong\u003e.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFulfillment Timeline:\u003c\/strong\u003e Secure industrial anti-static packaging with expedited processing and dispatch within \u003cstrong\u003e24-48 hours\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003ePurchasing Guide \u0026amp; Expert Selection Tips\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBackplane Power Audit:\u003c\/strong\u003e Verify that your 1771 chassis power supply can reliably support the 3.3A current draw at 5 VDC before integrating this high-capacity processor.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMemory Requirement Review:\u003c\/strong\u003e Confirm that your application logic fits within the 48 kiloword limit, or select an optional EEPROM module (such as 1785-ME64) for non-volatile backup storage.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInventory Readiness:\u003c\/strong\u003e Maintaining a spare \u003cstrong\u003e1785-L40L\u003c\/strong\u003e processor on-site eliminates extended downtime risks for legacy PLC-5 architectures.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eProfessional Frequently Asked Questions\u003c\/h3\u003e\n  \n  \u003cp\u003e\u003cstrong\u003eQ: Can the 1785-L40L processor be installed in any slot within the 1771 chassis?\u003c\/strong\u003e\u003cbr\u003e\n  A: No, this processor must strictly be installed in the leftmost slot of the primary 1771 I\/O chassis rack to function correctly.\u003c\/p\u003e\n\n  \u003cp\u003e\u003cstrong\u003eQ: What types of addressing modes are supported by this controller?\u003c\/strong\u003e\u003cbr\u003e\n  A: The controller supports half-slot addressing, single-slot addressing, and double-slot addressing to accommodate 8-point, 16-point, and 32-point I\/O modules.\u003c\/p\u003e\n\n  \u003cp\u003e\u003cstrong\u003eQ: How does the processor handle non-volatile memory backup?\u003c\/strong\u003e\u003cbr\u003e\n  A: It features built-in static RAM backed by a battery, and it supports optional EEPROM program backup modules including the 1785-ME16, -ME32, -ME64, and -M100 series.\u003c\/p\u003e\n\n  \u003cp\u003e\u003cstrong\u003eQ: What network protocols are supported by the main communication port?\u003c\/strong\u003e\u003cbr\u003e\n  A: The double communication port supports Data Highway Plus (DH+) networking and Remote I\/O communications, configurable as either an adapter or scanner.\u003c\/p\u003e\n\n  \u003cp\u003e\u003cstrong\u003eQ: What shipping carriers are used for international orders?\u003c\/strong\u003e\u003cbr\u003e\n  A: All global orders are securely dispatched via premium carriers including \u003cstrong\u003eFedEx\u003c\/strong\u003e, \u003cstrong\u003eUPS\u003c\/strong\u003e, and \u003cstrong\u003eDHL\u003c\/strong\u003e with a 24-48 hour turnaround time.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":45013985132726,"sku":"1785-L40L","price":126.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/1785-L40L_ebfc9f37-3876-43a0-ad3b-69a3e7e66caa.jpg?v=1790145438","url":"https:\/\/www.plcsparehub.com\/products\/1785-l40l-allen-bradley-plc-5-processor-module-buy-online","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}