{"product_id":"allen-bradley-plc-5-1785-l40b-plc-5-40-processor-module","title":"Allen-Bradley PLC-5 1785-L40B PLC-5\/40 Processor Module","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1785-L40B\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1785-L40B\u003c\/strong\u003e PLC Processor Module, operates as a dedicated hardware component for executing ladder logic processing and I\/O control tasks within PLC-5 control system platforms.\u003c\/p\u003e\n\u003ch3\u003eModel Identification\u003c\/h3\u003e\n\u003cp\u003eThe 1785-L40B is a PLC-5\/40 processor module designed for PLC-5 chassis installation. It provides processor execution, SRAM memory storage, DH+ communication, Remote I\/O communication, and EEPROM program backup capability.\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\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003ePLC-5\/40 Processor Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003ePLC-5\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\u003e1.38 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e4.8 x 16.5 x 27.3 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMemory Type\u003c\/td\u003e\n\u003ctd\u003eSRAM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMemory Capacity\u003c\/td\u003e\n\u003ctd\u003e48K Words\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog I\/O Capacity\u003c\/td\u003e\n\u003ctd\u003e2048 Analog I\/O\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProgram Backup\u003c\/td\u003e\n\u003ctd\u003eEEPROM Supported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Type\u003c\/td\u003e\n\u003ctd\u003ePLC-5 Chassis Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003ePLC-5 Processor Architecture\u003c\/h3\u003e\n\u003cp\u003eThe Allen-Bradley 1785-L40B integrates processor execution functions with PLC-5 backplane communication. The module exchanges data with installed I\/O modules through the chassis backplane and manages control instructions stored in processor memory.\u003c\/p\u003e\n\u003cp\u003eThe PLC-5 platform uses dedicated communication channels for Data Highway Plus (DH+) and Remote I\/O networks. The processor supports distributed I\/O control through configured communication links and maintains application logic through SRAM-based memory with EEPROM backup capability.\u003c\/p\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Allen-Bradley 1785-L40B PLC-5\/40 Processor Module\u003c\/li\u003e\n\u003cli\u003eCompatible PLC-5 chassis installation hardware is not included unless specified separately\u003c\/li\u003e\n\u003cli\u003eEEPROM backup module is not included unless supplied as an additional component\u003c\/li\u003e\n\u003cli\u003eProgramming accessories and communication cables are ordered separately\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003ch4\u003eChassis Installation\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eInstall the module into a compatible PLC-5 chassis slot.\u003c\/li\u003e\n\u003cli\u003eVerify chassis power is removed before module insertion or removal.\u003c\/li\u003e\n\u003cli\u003eEnsure the module edge connector is fully seated with the backplane connector.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCommunication Wiring\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eUse approved DH+ network cabling and termination methods.\u003c\/li\u003e\n\u003cli\u003eSeparate communication cables from high-voltage power wiring to reduce electrical interference.\u003c\/li\u003e\n\u003cli\u003eVerify network node addressing before system commissioning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eMemory Handling\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eConfirm processor memory status before replacing or transferring application programs.\u003c\/li\u003e\n\u003cli\u003eUse EEPROM backup procedures according to PLC-5 programming requirements.\u003c\/li\u003e\n\u003cli\u003eAvoid removing memory components during powered operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWhat is the main function of the 1785-L40B?\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 1785-L40B is a PLC-5\/40 processor module that executes control programs and manages communication between the processor, chassis backplane, and connected I\/O systems.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWhat memory type does the 1785-L40B use?\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe module uses 48K word SRAM for processor application storage and supports EEPROM for program backup operations.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDoes the 1785-L40B support DH+ communication?\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eYes. The module provides DH+ communication capability through dedicated communication channels for PLC-5 network applications.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCan the 1785-L40B control Remote I\/O devices?\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eYes. The processor supports Remote I\/O communication channels for distributed Allen-Bradley I\/O configurations.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIs the 1785-L40B compatible with ControlLogix chassis?\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNo. The 1785-L40B belongs to the PLC-5 platform and requires compatible PLC-5 chassis hardware.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWhat type of installation does the processor require?\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe module requires installation in a compatible PLC-5 chassis with an available processor slot and proper backplane connection.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDoes the processor include non-volatile program storage?\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe processor uses SRAM for operating memory and supports EEPROM backup functions for retaining application programs.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCan the 1785-L40B be removed while powered?\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eModule removal should follow PLC-5 maintenance procedures. Power isolation is recommended before physical removal or replacement.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":46066451153069,"sku":"1785-L40B","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/11785-L40B_10.jpg?v=1785858485","url":"https:\/\/www.maxwellplc.com\/ru\/products\/allen-bradley-plc-5-1785-l40b-plc-5-40-processor-module","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}