{"product_id":"allen-bradley-1747-l531-e-slc-5-03-processor-module","title":"Allen-Bradley 1747-L531\/E SLC 5\/03 Processor Module","description":"\u003ch1 class=\"PDq2pG_selectionAnchorContainer\"\u003eAllen-Bradley 1747-L531\/E SLC 5\/03 Processor Module\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h1\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003eAllen-Bradley\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1747-L531\/E\u003c\/strong\u003e, also cataloged as the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSLC 5\/03\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eprocessor module, serves as the primary SLC 500 CPU utilized to execute program logic scheduling and I\/O scan coordination across SLC 500 chassis platforms. It operates with integrated RS-232 (DF1) and DH-485 communication handling and maintains execution timing via a fixed backplane cycle.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e1747-L531\u003c\/strong\u003e: SLC 5\/03 processor base designation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\/E\u003c\/strong\u003e: Series revision level indicator\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNo additional functional hardware variants are defined within this catalog number structure\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth class=\"last:pe-10\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\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\u003e1747-L531\/E\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\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.45 kg\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\u003e500 mA at 5 V DC (backplane current)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessor Type\u003c\/td\u003e\n\u003ctd\u003eSLC 5\/03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUser Memory\u003c\/td\u003e\n\u003ctd\u003e8 KB battery-backed RAM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Capacity\u003c\/td\u003e\n\u003ctd\u003eup to 4,096 digital I\/O \/ 180 analog I\/O\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProgram Scan Time\u003c\/td\u003e\n\u003ctd\u003e1 ms per K instructions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Scan Time\u003c\/td\u003e\n\u003ctd\u003eapprox. 0.225 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Interfaces\u003c\/td\u003e\n\u003ctd\u003eRS-232 (DF1), DH-485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackup Memory\u003c\/td\u003e\n\u003ctd\u003e1747-M13 EEPROM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery\u003c\/td\u003e\n\u003ctd\u003e1747-BA lithium battery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eBackplane Execution \u0026amp; Deterministic Scan Control\u003c\/h3\u003e\n\u003cp\u003eThe SLC 5\/03 CPU implements fixed-cycle backplane arbitration where instruction execution is synchronized with I\/O refresh cycles. Backplane current draw at 5 V DC defines chassis loading constraints, directly impacting slot allocation in 1746 chassis systems. RS-232 and DH-485 interfaces operate asynchronously to the scan cycle, allowing external DF1 devices to interact without blocking I\/O processing queues.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 1747-L531\/E be hot-swapped within an active SLC 500 chassis?\u003cbr\u003eA: No. CPU removal requires chassis power removal due to backplane signal and memory state coupling.\u003c\/p\u003e\n\u003cp\u003eQ: How does backplane current affect module population limits?\u003cbr\u003eA: Total chassis load must remain within backplane power budget; CPU consumes 500 mA at 5 V DC, reducing available current for I\/O modules.\u003c\/p\u003e\n\u003cp\u003eQ: Does firmware or memory configuration affect scan cycle timing?\u003cbr\u003eA: Yes. Instruction density in 8 KB user memory directly impacts program scan time measured at approximately 1 ms per K instructions.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eInstall CPU only in slot 0 of a 1746 SLC chassis\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eVerify backplane power integrity before insertion\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMaintain shield grounding continuity for RS-232 and DH-485 cabling\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAvoid routing communication lines parallel to high-noise motor conductors\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEnsure lithium battery (1747-BA) is installed prior to memory retention requirements\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eConfirm chassis grounding impedance meets standard industrial control cabinet practice\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43545155534938,"sku":"1747-L531\/E","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1747-L531E2.jpg?v=1782286661","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1747-l531-e-slc-5-03-processor-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}