{"product_id":"allen-bradley-1785-l40l-plc-5-40l-standard-processor","title":"Allen-Bradley 1785-L40L PLC-5\/40L Standard Processor","description":"\u003ch2\u003eAllen-Bradley 1785-L40L PLC-5\/40L Standard Processor\u003c\/h2\u003e\n\u003cp\u003eConfigured for sequential control execution and I\/O data processing in PLC-5 DH+ \/ Remote I\/O networks, the \u003cstrong\u003eAllen-Bradley 1785-L40L\u003c\/strong\u003e (\u003cstrong\u003e1785-L40L\u003c\/strong\u003e PLC-5\/40L Standard Processor) provides direct physical\/electrical execution for programmable controller operations. The module supports 48 kilowords of battery-backed SRAM, extended local I\/O, and PLC-5 chassis communication functions.\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-L40L\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\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3.35 lbs \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eBackplane current: 3.3 A at 5 VDC\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 Type\u003c\/td\u003e\n\u003ctd\u003ePLC-5\/40L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Line\u003c\/td\u003e\n\u003ctd\u003ePLC-5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUser Memory\u003c\/td\u003e\n\u003ctd\u003e48 Kilowords battery-backed static RAM\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\u003eProtected Memory\u003c\/td\u003e\n\u003ctd\u003eNot supported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Total I\/O\u003c\/td\u003e\n\u003ctd\u003e2048 I\/O points (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 channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum I\/O Chassis\u003c\/td\u003e\n\u003ctd\u003e61 chassis total\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExtended Local I\/O Chassis\u003c\/td\u003e\n\u003ctd\u003e16 maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUniversal Remote I\/O Chassis\u003c\/td\u003e\n\u003ctd\u003e32 maximum per I\/O link\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Ports\u003c\/td\u003e\n\u003ctd\u003e1 x RS-232-C \/ RS-422-A \/ RS-423-A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Coprocessor Expansion Port\u003c\/td\u003e\n\u003ctd\u003eSupported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eEtherNet\/IP and PLC-5 Bus Communication Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe 1785-L40L processor operates within PLC-5 control architectures using DH+ and Remote I\/O communication structures. The processor manages scan execution, local rack updates, and remote I\/O data exchanges through configured PLC-5 communication channels. I\/O scan performance depends on rack type and communication rate, with specified scan times including 0.5 ms per external local rack and communication-dependent remote update intervals.\u003c\/p\u003e\n\u003cp\u003eThe processor supports I\/O density scaling through PLC-5 chassis expansion. The architecture allows up to 2048 analog I\/O points and configurable combinations of digital and analog modules according to the installed chassis arrangement.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1785-L40L support battery-backed memory retention?\u003cbr\u003eA: Yes. The processor includes battery-backed static RAM for retaining user program and data memory during power interruption conditions.\u003c\/p\u003e\n\u003cp\u003eQ: What type of I\/O communication does the 1785-L40L support?\u003cbr\u003eA: The processor supports DH+ and Remote I\/O communication architectures with extended local I\/O and universal remote I\/O chassis configurations.\u003c\/p\u003e\n\u003cp\u003eQ: Can the 1785-L40L use EEPROM program backup modules?\u003cbr\u003eA: Yes. EEPROM backup capability is available using compatible 1785-ME16, 1785-ME32, 1785-ME64, and 1785-M100 memory modules.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the processor module in the designated PLC-5 chassis slot according to the rack configuration requirements. Verify backplane power availability before insertion and removal procedures.\u003c\/p\u003e\n\u003cp\u003eRoute communication wiring separately from high-voltage power conductors and high-current switching circuits. Use shielded communication cables where required by the network installation design, with cable shields bonded according to site grounding practices.\u003c\/p\u003e\n\u003cp\u003eBefore commissioning, verify processor memory status, battery condition, I\/O rack addressing, and DH+ \/ Remote I\/O communication settings. Confirm that installed I\/O modules match the configured processor addressing structure.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43739349450842,"sku":"1785-L40L","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1785-L40L2.jpg?v=1785141096","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1785-l40l-plc-5-40l-standard-processor","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}