{"product_id":"allen-bradley-1785-l40b-plc-5-40-processor-module","title":"Allen-Bradley 1785-L40B PLC-5\/40 Processor Module","description":"\u003ch2\u003eAllen-Bradley 1785-L40B PLC-5\/40 Processor Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for PLC processing and distributed I\/O execution in PLC-5 control platforms, the \u003cstrong\u003eAllen-Bradley 1785-L40B\u003c\/strong\u003e (\u003cstrong\u003e1785-L40B\u003c\/strong\u003e PLC CPU Module) provides direct physical and electrical execution through DH+\/Remote I\/O communication channels, serial interface handling, and processor memory operations.\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-L40B\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\u003e17.3 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003ePLC CPU Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Family\u003c\/td\u003e\n\u003ctd\u003ePLC-5\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessor Type\u003c\/td\u003e\n\u003ctd\u003ePLC-5\/40 Standard Processor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUser Memory\u003c\/td\u003e\n\u003ctd\u003e48 KWords Battery-Backed Static RAM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Digital I\/O\u003c\/td\u003e\n\u003ctd\u003e2048 (any mix) or 2048 inputs + 2048 outputs (complementary)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Analog I\/O\u003c\/td\u003e\n\u003ctd\u003e2048\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current Load\u003c\/td\u003e\n\u003ctd\u003e3.3 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEmbedded Communication\u003c\/td\u003e\n\u003ctd\u003eFour DH+\/Remote I\/O channels (Adapter or Scanner), one serial port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSerial Communication Standards\u003c\/td\u003e\n\u003ctd\u003eRS-232, RS-422A, RS-423\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEEPROM Backup Support\u003c\/td\u003e\n\u003ctd\u003eSupported with 1785-ME16, 1785-ME32, 1785-ME64, and 1785-M100 modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum I\/O Chassis\u003c\/td\u003e\n\u003ctd\u003e61\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Remote I\/O Link\u003c\/td\u003e\n\u003ctd\u003e32 chassis per I\/O link\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\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003ePLC-5 Communication and Processor Architecture\u003c\/h3\u003e\n\u003cp\u003eThe 1785-L40B processor operates within the PLC-5\/40 architecture using DH+ and Remote I\/O networks for controller-to-I\/O communication. The four embedded DH+\/Remote I\/O channels support Adapter or Scanner configurations, allowing distributed I\/O management without external communication modules.\u003c\/p\u003e\n\u003cp\u003eThe processor uses 48 KWords battery-backed SRAM for application storage and supports EEPROM program backup through compatible memory modules. Firmware operation is designed around PLC-5 instruction execution, I\/O scanning, and deterministic controller processing.\u003c\/p\u003e\n\u003cp\u003eThe module supports PLC control expansion through the Control Coprocessor Expansion Port and provides one configurable serial communication interface for RS-232, RS-422A, and RS-423 connections.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What communication interfaces are integrated into the 1785-L40B processor?\u003c\/strong\u003e\u003cbr\u003eA: The processor contains four DH+\/Remote I\/O communication channels and one configurable serial port supporting RS-232, RS-422A, and RS-423 standards.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What memory configuration is available on the 1785-L40B?\u003c\/strong\u003e\u003cbr\u003eA: The module provides 48 KWords of battery-backed static RAM for PLC application programs and supports EEPROM program backup using compatible memory modules.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What I\/O capacity is supported by this PLC-5 processor?\u003c\/strong\u003e\u003cbr\u003eA: The processor supports up to 2048 I\/O points in any mix or 2048 inputs plus 2048 outputs in complementary configuration, with up to 2048 analog I\/O points.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1785-L40B processor in a compatible PLC-5 chassis with the specified Allen-Bradley power supply modules. Verify backplane seating, module keying, and chassis grounding before energizing the system.\u003c\/p\u003e\n\u003cp\u003eRoute DH+\/Remote I\/O communication cables separately from high-voltage power conductors and high-current switching circuits. Use proper cable shielding and connect shields according to the control cabinet grounding practice to reduce electrical interference.\u003c\/p\u003e\n\u003cp\u003eBefore replacement or maintenance operations, confirm application memory backup status and verify EEPROM program availability when used. Check communication node configuration, serial port settings, and I\/O addressing after installation.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43739330281562,"sku":"1785-L40B","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1785-L40B2.jpg?v=1785140634","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1785-l40b-plc-5-40-processor-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}