{"product_id":"allen-bradley-1747-bsn-backup-scanner-module","title":"Allen-Bradley 1747-BSN Backup Scanner Module","description":"\u003ch1\u003eAllen-Bradley 1747-BSN Backup Scanner Module\u003c\/h1\u003e\n\u003cp\u003eConfigured for SLC 500 redundant scanner coordination in 1746 backplane architectures, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1747-BSN\u003c\/strong\u003e, (\u003cstrong\u003e1747-BSN\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBackup Scanner Module) provides direct physical\/electrical execution of backup scanning and controller switchover management across SLC 5\/02 through SLC 5\/05 processor networks.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eThe 1747-BSN identifier is a fixed catalog designation within the SLC 500 backup and remote I\/O scanner family. No functional suffix segmentation or option coding is defined in the model structure.\u003c\/p\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-BSN\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\u003e0.45 kg \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 deg C to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e800 mA @ 5 VDC (backplane)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eBackup Scanner Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Line\u003c\/td\u003e\n\u003ctd\u003eSLC 500\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Processors\u003c\/td\u003e\n\u003ctd\u003eSLC 5\/02, 5\/03, 5\/04, 5\/05\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Interface\u003c\/td\u003e\n\u003ctd\u003e1746 backplane\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication\u003c\/td\u003e\n\u003ctd\u003eDH+, RS-232, Remote I\/O\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCable Type\u003c\/td\u003e\n\u003ctd\u003eBelden 9463\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Type\u003c\/td\u003e\n\u003ctd\u003e6-pin Phoenix connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eBackplane Scan Arbitration and Redundant Control Transfer\u003c\/h3\u003e\n\u003cp\u003eThe module implements SLC 500 backup scanning logic through synchronized 1746 backplane communication cycles. Scan data is mirrored between primary and secondary scanner paths, enabling deterministic switchover behavior during processor or communication fault conditions. DH+ and RS-232 channels are mapped into the scanner pipeline for remote I\/O and supervisory link monitoring. The backup scanner maintains state alignment through cyclic update windows tied to backplane scan execution, ensuring controlled handoff without discontinuity in I\/O image table synchronization.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1747-BSN participate in direct I\/O execution or only scanning functions?\u003cbr\u003eA: The module functions as a backup scanner and does not execute direct I\/O control logic; it mirrors scan data between primary and backup paths.\u003c\/p\u003e\n\u003cp\u003eQ: What is the impact of backplane current consumption on chassis design?\u003cbr\u003eA: The module draws 800 mA at 5 VDC from the backplane and must be included in total chassis power budget to avoid undervoltage conditions.\u003c\/p\u003e\n\u003cp\u003eQ: Can the module operate with SLC processors outside the listed compatibility range?\u003cbr\u003eA: Operation is limited to SLC 5\/02, 5\/03, 5\/04, and 5\/05 processor families; other processor types are not supported by the scan synchronization protocol.\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 the module in a compatible 1746 chassis with verified backplane integrity.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEnsure processor compatibility is validated before system integration.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUse Belden 9463 cable for DH+ and remote I\/O communication paths.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMaintain separation between RS-232 and high-noise switching conductors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eVerify connector seating on the 6-pin Phoenix terminal block before energization.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eConfirm backup\/primary scanner configuration alignment prior to system start-up.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43537880186970,"sku":"1747-BSN","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1747-BSN2.jpg?v=1782205898","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1747-bsn-backup-scanner-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}