{"product_id":"allen-bradley-1785-l40l-industrial-automation-module-reliable","title":"Allen-Bradley 1785-L40L Industrial Automation Module - Reliable","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThe Allen-Bradley 1785-L40L is a PLC-5\/40L Standard Processor designed for complex industrial automation. With 48K words of user memory and support for up to 2048 analog I\/O points, this module coordinates field devices with precision. Its extended local I\/O capability makes it ideal for distributed control systems.\u003c\/p\u003e\u003ch2\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh I\/O Capacity:\u003c\/strong\u003e Supports up to 2048 total I\/O (any mix) or 2048 in\/2048 out complementary, handling large-scale operations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Memory:\u003c\/strong\u003e 48 kilowords of battery-backed static RAM ensures program retention; optional EEPROM backup via 1785-ME16\/-ME32\/-ME64\/-M100.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Networking:\u003c\/strong\u003e Double DH+ or Remote I\/O port configurable for adapter or scanner roles, plus one RS-232-C\/422-A\/423-A port.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust Construction:\u003c\/strong\u003e UL, CE, C-TICK, and CSA certified; operates in 0–60°C environments.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eRockwell Automation\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\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e1785-L40L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eStandard Processor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessor\u003c\/td\u003e\n\u003ctd\u003ePLC-5\/40L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax User Memory Words\u003c\/td\u003e\n\u003ctd\u003e48 Kilowords\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery-Backed Static RAM\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEEPROM Backup Option\u003c\/td\u003e\n\u003ctd\u003eYes (1785-ME16, -ME32, -ME64, -M100)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtected Memory\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Total I\/O\u003c\/td\u003e\n\u003ctd\u003e2048 (any mix) or 2048 in + 2048 out (complementary)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Analog I\/O\u003c\/td\u003e\n\u003ctd\u003e2048\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Scan Time Per Rack\u003c\/td\u003e\n\u003ctd\u003e0.5 ms (ext. local), 10 ms @57.6 kbits\/s, 7 ms @115.2 kbits\/s, 3 ms @230.4 mbits\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax I\/O Chassis Total\u003c\/td\u003e\n\u003ctd\u003e61\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax I\/O Chassis Extended Local\u003c\/td\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax I\/O Chassis Universal Remote\u003c\/td\u003e\n\u003ctd\u003e32 per I\/O link\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRS-232-C\/422-A\/423-A Ports\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Coprocessor Expansion Port\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eIndustry Applications\u003c\/h2\u003e\u003cp\u003eThe 1785-L40L excels in manufacturing lines, material handling, and process control. For example, in a bottling plant, it coordinates hundreds of sensors and actuators across multiple I\/O chassis, ensuring precise filling and capping. Its high analog I\/O capacity suits continuous processes like temperature or flow control.\u003c\/p\u003e\u003ch2\u003eInstallation \u0026amp; Setup\u003c\/h2\u003e\u003cp\u003eInstall the 1785-L40L in the leftmost slot of a 1771 I\/O chassis. Connect the backplane power supply; the module draws 3.3A at 5V DC. For extended local I\/O, use an adapter to link up to 16 additional chassis. Configure communication ports via software for DH+ or Remote I\/O operation.\u003c\/p\u003e\u003ch2\u003eMaintenance \u0026amp; Reliability\u003c\/h2\u003e\u003cp\u003ePeriodically check the battery-backed RAM to ensure program retention. The module dissipates 17W heat; ensure adequate ventilation. Inspect connections and verify scan times remain within specs. Its robust design minimizes downtime, offering long-term cost savings.\u003c\/p\u003e\u003ch2\u003eCompatibility \u0026amp; Integration\u003c\/h2\u003e\u003cp\u003eThe 1785-L40L works with Bulletin 1771, 1794, 1746, and 1791 I\/O modules. It supports 8, 16, and 32-point modules with half\/single\/double slot addressing. It connects to DH+ and Remote I\/O networks, enabling integration with existing Allen-Bradley systems.\u003c\/p\u003e\u003ch2\u003eBuying Guide\u003c\/h2\u003e\u003cp\u003eBefore purchasing, verify your system's backplane current capacity (3.3A at 5V) and memory requirements. Confirm the need for EEPROM backup modules. PLC Source PRO offers genuine Allen-Bradley 1785-L40L processors with fast shipping and expert support.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default","offer_id":44436157890659,"sku":"1785-L40L","price":260.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0678\/8635\/0435\/files\/1785-BCM_e5c0c354-c3fc-41e1-9ea8-7f3bcea1972a.jpg?v=1785794044","url":"https:\/\/www.plcsourcepro.com\/products\/allen-bradley-1785-l40l-industrial-automation-module-reliable","provider":"PLC Source PRO","version":"1.0","type":"link"}