{"product_id":"allen-bradley-1785-l40e-ethernet-plc-5-processor-module","title":"Allen-Bradley 1785-L40E Ethernet PLC-5 Processor Module","description":"\u003cp\u003eConfigured for high-speed logic processing and Ethernet network integration in 1771 Universal I\/O chassis platforms, the \u003cstrong\u003eAllen-Bradley 1785-L40E\u003c\/strong\u003e (\u003cstrong\u003e1785-L40E\u003c\/strong\u003e Ethernet PLC-5 Processor Module) provides direct physical execution of discrete, analog, and advanced PID loop control tasks.\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\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-L40E\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\u003e3.75 lbs (1.70 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard 1771 Single-Slot Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C (32 to 140 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNon-Operating Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to 85 deg C (-40 to 185 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Dissipation\u003c\/td\u003e\n\u003ctd\u003e17.3 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003e5 VDC (Backplane)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current Draw\u003c\/td\u003e\n\u003ctd\u003e3.3 A @ 5 VDC max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUser Memory\u003c\/td\u003e\n\u003ctd\u003e48k Words SRAM (Battery-Backed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProgram Memory Backup\u003c\/td\u003e\n\u003ctd\u003eOptional EEPROM (1785-ME16, -ME32, -ME64, -M100)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery Module\u003c\/td\u003e\n\u003ctd\u003e1770-XYC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum I\/O Capacity\u003c\/td\u003e\n\u003ctd\u003e2048 Total I\/O (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\u003eMax Total Chassis\u003c\/td\u003e\n\u003ctd\u003e61 (1 Local, 60 Universal Remote)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEmbedded Communication Ports\u003c\/td\u003e\n\u003ctd\u003e1 Ethernet (10\/100 Mbps), 2 DH+\/Remote I\/O (Configurable Scanner\/Adapter), 1 Serial (RS-232\/423\/422A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Chassis \/ Power\u003c\/td\u003e\n\u003ctd\u003e1771-A1B, -A2B, -A3B, -A3B1, -A4B \/ 1771-P4S, -P6S, -P4S1, -P6S1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eDeterministic Backplane Bus \u0026amp; Network Architecture\u003c\/h3\u003e\n\u003cp\u003eThe 1785-L40E processor resides in the primary slot of a 1771 chassis, interfacing via the 1771 backplane bus to control up to 2048 discrete or analog I\/O points across 61 maximum chassis. Operating with determinism across its integrated Ethernet interface and dual DH+\/Remote I\/O ports, the module achieves Remote I\/O rack scan speeds from 10 ms at 57.6 kbps down to 3 ms at 230.4 kbps. Internal 48k word battery-backed SRAM stores application ladder routines, function blocks, and register tables, maintaining memory state via an onboard 1770-XYC battery assembly. High I\/O density scaling is supported through 2-slot, 1-slot, and half-slot addressing modes across local and remote chassis links.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What is the backplane power supply requirement for the 1785-L40E processor?\u003c\/p\u003e\n\u003cp\u003eA: The 1785-L40E draws 3.3 A at 5 VDC from the 1771 backplane power supply and dissipates up to 17.3 W of power. Chassis power supply selection (such as 1771-P4S or 1771-P6S) must accommodate this current load along with installed I\/O modules.\u003c\/p\u003e\n\u003cp\u003eQ: How is memory retention preserved on the 1785-L40E during power interruption?\u003c\/p\u003e\n\u003cp\u003eA: System program memory and registers are maintained by an onboard 1770-XYC lithium battery. For permanent non-volatile backup, optional EEPROM modules (1785-ME16, 1785-ME32, 1785-ME64, or 1785-M100) can be installed directly into the processor socket.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Isolation\u003c\/strong\u003e: Always disconnect 1771 chassis power supply primary power before inserting or extracting the 1785-L40E module to prevent backplane edge-connector damage or transient electrical disruption.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModule Mounting\u003c\/strong\u003e: Slide the processor into Slot 0 of a compatible 1771 Universal I\/O chassis (1771-A1B through 1771-A4B). Engage the top and bottom card locking levers firmly to ensure complete seating into the backplane connectors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEthernet and Field Wiring\u003c\/strong\u003e: Route Ethernet network cabling and DH+\/RIO twinaxial shielded cables in dedicated wire raceways separated from high-voltage AC lines. Ground the cable shield at a single chassis grounding point to prevent high-frequency noise interference.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery Connection\u003c\/strong\u003e: Connect the 1770-XYC battery harness prior to powering up the system for initial configuration. Verify the BATT LED on the front panel remains unlit after power-up.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKeyswitch Operation\u003c\/strong\u003e: Adjust the 3-position keyswitch (RUN, PROG, REM) to the desired access level after verifying system communication settings in RSLogix 5.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":48770297069758,"sku":"1785-L40E","price":95.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/1785-LT2_2_ece174d6-c911-4403-b6ff-c9afe100080b.png?v=1787296764","url":"https:\/\/www.autooiltech.com\/products\/allen-bradley-1785-l40e-ethernet-plc-5-processor-module","provider":"AutoOilTech Limited","version":"1.0","type":"link"}