{"product_id":"allen-bradley-1756-ib16d-a-controllogix-diagnostic-digital-input-module","title":"Allen-Bradley 1756-IB16D\/A ControlLogix Diagnostic Digital Input Module","description":"\u003ch1\u003eAllen-Bradley 1756-IB16D\/A ControlLogix Diagnostic Digital Input Module\u003c\/h1\u003e\n\u003cp\u003eConfigured for DC discrete signal acquisition with embedded line and device fault monitoring in ControlLogix backplane systems, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1756-IB16D\/A\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(\u003cstrong\u003e1756-IB16D\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ediagnostic digital input module) provides direct electrical state sampling of 16-channel 24 V DC inputs while simultaneously executing diagnostic evaluation of wiring integrity and field device connectivity across ControlLogix chassis architectures.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eThe provided configuration\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-IB16D\/A\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003econtains no further documented option code segmentation beyond the base diagnostic designator “D” and revision suffix “\/A”. No additional structural or electrical sub-variants are defined in the supplied dataset.\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\u003e1756-IB16D\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003eAllen-Bradley\u003c\/span\u003e\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\u003eChannels\u003c\/td\u003e\n\u003ctd\u003e16 DC input channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e10 to 30 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Input Voltage\u003c\/td\u003e\n\u003ctd\u003e24 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Current\u003c\/td\u003e\n\u003ctd\u003e~2.1 mA per point at 24 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e110 mA at 5.1 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003e250 V (input to backplane)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Delay\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 1 ms typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagnostics\u003c\/td\u003e\n\u003ctd\u003eOpen-wire, short-circuit, device fault detection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to 85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelative Humidity\u003c\/td\u003e\n\u003ctd\u003e5% to 95% non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eUL, CE, CSA, C-Tick, KC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSlot Type\u003c\/td\u003e\n\u003ctd\u003eControlLogix chassis module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eControlLogix Backplane Diagnostics Execution Layer\u003c\/h3\u003e\n\u003cp\u003eThe 1756-IB16D\/A executes dual-path processing within the ControlLogix backplane: one path samples DC input state transitions, while the second path performs diagnostic evaluation of circuit continuity and impedance deviation. Diagnostic flags for open-wire and short-circuit conditions are generated at module level prior to controller tag mapping, enabling pre-processed fault signaling within deterministic backplane scan cycles. The module participates in chassis-level I\/O scheduling where diagnostic and process data are synchronized per scan interval.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1756-IB16D\/A perform diagnostics per channel independently?\u003cbr\u003eA: Yes, each of the 16 DC input channels is individually monitored for open-wire and short-circuit conditions with channel-level fault reporting.\u003c\/p\u003e\n\u003cp\u003eQ: Does diagnostic processing affect input scan time?\u003cbr\u003eA: Input state acquisition remains \u0026lt; 1 ms typical; diagnostic evaluation runs in parallel within module-level processing and does not redefine backplane scan scheduling.\u003c\/p\u003e\n\u003cp\u003eQ: Can the module operate in RIUP mode during diagnostics?\u003cbr\u003eA: Removal and Insertion Under Power is supported at chassis level; diagnostic state is cleared and reinitialized upon module reinsertion and re-enumeration.\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 module in a compatible ControlLogix chassis slot ensuring correct backplane alignment and locking.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMaintain separation between DC input wiring and high-noise switching conductors to preserve diagnostic signal integrity.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUse shielded cable where long field runs are present; terminate shield at single-point cabinet ground reference only.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eVerify field device voltage range (10 to 30 V DC) prior to energizing input circuits.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEnsure stable terminal seating to avoid false diagnostic triggering due to intermittent contact resistance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43585761869914,"sku":"1756-IB16D\/A","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1756-IB16A1.jpg?v=1783066132","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1756-ib16d-a-controllogix-diagnostic-digital-input-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}