{"product_id":"1769-ia8i-compact-i-o-8-point-120vac-digital-input-card-allen-bradley","title":"1769-IA8I Compact I\/O 8-Point 120VAC Digital Input Card - Allen-Bradley","description":"\u003ch3\u003e\u003cb\u003eProduct Overview\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong style=\"color: #0056b3;\"\u003e1769-IA8I\u003c\/strong\u003e is an 8-point 120VAC discrete input module engineered by \u003cstrong style=\"color: #0056b3;\"\u003eAllen-Bradley\u003c\/strong\u003e for the \u003cstrong style=\"color: #0056b3;\"\u003eCompactLogix\u003c\/strong\u003e and MicroLogix 1500 controller platforms. Designed specifically with individual channel-to-channel isolation, this module allows process signals from distinct, unsynchronized AC voltage sources to interface safely within a single rack assembly.\u003c\/p\u003e\n\u003cp\u003eOperating across a nominal voltage window of 79–132VAC at 47–63 Hz, the \u003cstrong style=\"color: #0056b3;\"\u003e1769-IA8I\u003c\/strong\u003e provides 132VAC working voltage isolation according to IEC Class II reinforced insulation standards. With galvanic point-to-point isolation rated at 1517VAC (or 2145VDC) for 1 second, it mitigates ground loop current hazards and phase cross-talk in complex industrial power distribution networks.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eTechnical Specifications\u003c\/b\u003e\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eModel Number\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong style=\"color: #0056b3;\"\u003e1769-IA8I\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eBrand \u0026amp; Manufacturer\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong style=\"color: #0056b3;\"\u003eAllen-Bradley\u003c\/strong\u003e \/ Rockwell Automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eProduct Series\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003ca href=\"https:\/\/www.plcsparehub.com\/collections\/allen-bradley-1769-compactlogix\"\u003e\u003cstrong style=\"color: #0056b3;\"\u003eCompactLogix\u003c\/strong\u003e\u003c\/a\u003e \/ Compact I\/O Architecture\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eModule Classification\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e8-Point Individually Isolated 120VAC Discrete AC Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eNominal Operating Voltage\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e100\/120 VAC (79 to 132 VAC Range)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eAC Line Frequency Range\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e47 to 63 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eChannel-to-Channel Isolation\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e132VAC Working Voltage (1517VAC for 1 sec \/ 2145VDC for 1 sec)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eON-State Signal Characteristics\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eMin 79 VAC | Min Current 5 mA @ 74VAC | Max Current 12 mA @ 120VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eOFF-State Signal Characteristics\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eMax OFF Voltage 20 VAC | Max OFF Current 2.5 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eSignal Delay Timing\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e20 ms (OFF-to-ON) | 20 ms (ON-to-OFF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eInrush Current Maximum\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e250 mA Peak\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eBackplane Current Draw\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e90 mA @ 5.1 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eModule Power Dissipation\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e1.81 Watts Total Heat Dissipation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eInput Impedance Rating\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e12 kΩ @ 50 Hz | 10 kΩ @ 60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003ePower Supply Distance Rating\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e8 Modules max from system power supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eVibration \u0026amp; Shock Ratings\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e30g Operating Shock (Panel Mount) | 5g Operating Vibration (10–500 Hz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003ePhysical Dimensions \u0026amp; Weight\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e1.38 x 3.43 x 4.65 in (35 x 87 x 118 mm) | 0.61 lbs (276 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cb\u003eDiagnostic Capabilities \u0026amp; Channel Features\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eChannel Status LEDs:\u003c\/b\u003e Individual status indicators illuminate when the input voltage exceeds the 79 VAC minimum ON threshold.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eContinuous Galvanic Barrier:\u003c\/b\u003e Prevents common-mode noise propagation between independently powered plant field circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eNoise Suppression Architecture:\u003c\/b\u003e Built-in RC filtering attenuates line transients and contact bounce across a 20 ms delay window.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eInrush Current Limiting:\u003c\/b\u003e Circuitry dampens high current surges during contact closure, protecting internal optocoupler stages.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eTarget Application Scenarios \u0026amp; Equipment Integration\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eMulti-Phase Motor Control Centers (MCC):\u003c\/b\u003e Monitored auxiliary contacts powered from different control transformer phases.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSubstation Switchgear Interfacing:\u003c\/b\u003e Directly captures breaker status signals sourced from separate 120VAC control buses without interposing relays.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eInter-Cabinet Safety Interlocks:\u003c\/b\u003e Connects remote limit switches powered by distinct local control power circuits across large facilities.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eInstallation \u0026amp; Wiring Guidelines\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eSeparate Phase Connections:\u003c\/b\u003e Channel-to-channel isolation allows different channels to connect to L1 phases of separate 120VAC transformers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDistance Rating Budget:\u003c\/b\u003e Mount within 8 expansion slots of the system expansion power supply (e.g., 1769-PA2, 1769-PB4).\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCable Selection \u0026amp; Routing:\u003c\/b\u003e Use copper wire rated for 90°C (22–14 AWG) and separate AC input bundles from DC control circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eEnclosure Mounting:\u003c\/b\u003e Install vertically inside an IP54-rated panel enclosure using standard 35 mm DIN rail or panel screws.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003ePackaging, Logistics \u0026amp; Warranty Terms\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eShipment Lead Time:\u003c\/b\u003e Dispatches within 24 to 48 hours following payment verification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eGlobal Express Couriers:\u003c\/b\u003e Express delivery via DHL Express, FedEx, and UPS.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eStandard Packaging:\u003c\/b\u003e Enclosed in protective anti-static materials and reinforced outer shipping boxes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e12-Month Coverage:\u003c\/b\u003e Protected by a full 12-month quality replacement warranty against hardware defects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eEngineering Buyer's Guide\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eCheck Isolation Requirements:\u003c\/b\u003e Select this isolated version when inputs originate from different supply transformers; use standard 1769-IA8 for single-source circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eEvaluate Leakage Currents:\u003c\/b\u003e Ensure solid-state output sensors connected to inputs do not exceed the 2.5 mA maximum OFF-state leakage limit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCalculate Total Backplane Load:\u003c\/b\u003e Verify the 90 mA @ 5.1V draw against your controller CPU or expansion power supply capacity.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eFrequently Asked Questions (FAQ)\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eQ: What is the primary functional difference between the standard 1769-IA8 and the 1769-IA8I card?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eA: The standard module shares a common neutral return across its points, while the isolated card provides independent hot and neutral connections for each point, allowing usage across different AC supply circuits.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: Why does the module specify a 20 ms input filter delay?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eA: The 20 ms delay filters out mechanical contact bounce, AC zero-crossing ripples, and electrical line noise to ensure stable signal transitions in the controller logic.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: Can I connect a 24VDC discrete input signal to a channel on this card?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eA: No, the minimum ON-state voltage threshold is 79 VAC. Lower DC voltages will not trigger the optocoupler logic stage.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: How does proper terminal block wiring prevent accidental cross-wiring in multi-phase panels?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eA: Utilizing individual terminal point labels and double-checking potential differences between isolated terminals ensures phase-to-phase short circuits are avoided during commissioning.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: What field conditions typically cause a channel LED to remain off despite applying control voltage?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eA: This usually occurs when incoming line voltage drops below 79 VAC, excessive series resistance reduces current below 5 mA, or the field return wire is disconnected.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eGlobal PLC Spare HUB's Insight\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eDuring a commissioning service call at a municipal wastewater pump station, an engineer reported erratic input faults when monitoring auxiliary contacts on four large motor starters. The system was using a standard non-isolated AC input card fed by different 120VAC control transformers across the MCC drawers.\u003c\/p\u003e\n\u003cp\u003eOur field team diagnosed circulating ground currents and phase-to-phase potential offsets between the control transformers, which were corrupting the common return bus. By replacing the existing module with a \u003cstrong style=\"color: #0056b3;\"\u003e1769-IA8I\u003c\/strong\u003e isolated card and running dedicated hot and return wires for each channel, we isolated the transformer grounds completely. Input signals settled immediately with zero ground loop interference. In applications involving multiple control power sources, utilizing individually isolated cards prevents costly ground-fault troubleshooting!\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":45013902196918,"sku":"1769-IA8I","price":175.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/1769-IA8I_f762fcd7-46a0-4bb2-8d75-3265f1f7923e.jpg?v=1788944835","url":"https:\/\/www.plcsparehub.com\/products\/1769-ia8i-compact-i-o-8-point-120vac-digital-input-card-allen-bradley","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}