{"product_id":"1794-if8ih-allen-bradley-flex-i-o-hart-analog-input-module","title":"1794-IF8IH Allen-Bradley Flex I\/O HART Analog Input Module","description":"\u003ch3\u003e\u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1794-IF8IH\u003c\/span\u003e Allen-Bradley Flex I\/O HART Analog Input Module Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley \u003cspan style=\"color: #ff0000;\"\u003e1794-IF8IH\u003c\/span\u003e\u003c\/strong\u003e is a high-density HART-enabled analog input module designed for the \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eFlex I\/O\u003c\/span\u003e\u003c\/strong\u003e platform. This module integrates eight isolated, single-ended channels, providing superior signal integrity by eliminating ground loops in complex industrial environments. Engineered for precision, the \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1794-IF8IH\u003c\/span\u003e\u003c\/strong\u003e utilizes Sigma-Delta conversion technology to deliver high-resolution data acquisition for both unipolar and bipolar signals. It is an essential component for distributed control architectures requiring reliable HART instrument communication.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specification Matrix\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e \u003cstrong\u003eAllen-Bradley\u003c\/strong\u003e \/ \u003cstrong\u003eRockwell Automation\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1794-IF8IH\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eFlex I\/O\u003c\/span\u003e 1794\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Count:\u003c\/strong\u003e 8 Isolated, Single-Ended Channels\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConversion Type:\u003c\/strong\u003e Sigma-Delta (High Precision)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnipolar Resolution:\u003c\/strong\u003e 16 Bits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBipolar Resolution:\u003c\/strong\u003e 15 Bits + Sign\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal DC Voltage:\u003c\/strong\u003e 19.2 to 31.2V DC (Nominal 24V DC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexbus Current:\u003c\/strong\u003e 80 mA @ 5V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Dissipation:\u003c\/strong\u003e 4.8 Watts maximum @ 31.2V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Dissipation:\u003c\/strong\u003e 16.4 BTU\/hr @ 31.2V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironmental Rating:\u003c\/strong\u003e Open Enclosure; 0°C to 55°C (32°F to 131°F)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 3.7 x 3.7 x 2.6 inches (94 x 94 x 66 mm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eGlobal PLC Spare HUB’s Insight\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1794-IF8IH\u003c\/span\u003e\u003c\/strong\u003e stands out due to its dual-layered isolation—both channel-to-channel and channel-to-backplane. Unlike standard modules, the \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1794-IF8IH\u003c\/span\u003e\u003c\/strong\u003e allows for direct HART asset management, enabling maintenance teams to extract secondary variables and device diagnostics without extra bypass hardware. For engineers migrating from older 1794-IF8 series, this module offers a significant jump in noise rejection and signal precision.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eEquipment Compatibility \u0026amp; Applications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Terminal Bases:\u003c\/strong\u003e \u003cstrong\u003e1794-TB3\u003c\/strong\u003e, \u003cstrong\u003e1794-TB3S\u003c\/strong\u003e (Requires shielded wiring).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eController Integration:\u003c\/strong\u003e ControlLogix, CompactLogix, and PLC-5 via Flex I\/O adapters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHazardous Zones:\u003c\/strong\u003e Approved for North American Hazardous Location standards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTypical Scenarios:\u003c\/strong\u003e Chemical dosing, refinery tank level monitoring, and high-precision pressure loops where ground potential differences are common.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eDiagnostic \u0026amp; Maintenance Capabilities\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReal-time HART Data:\u003c\/strong\u003e Access device status, manufacturer ID, and tag information directly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal Validation:\u003c\/strong\u003e Detects wire-break and out-of-range conditions via the backplane interface.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibration:\u003c\/strong\u003e Factory calibrated with support for field-specific offset adjustments when necessary.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring Hierarchy:\u003c\/strong\u003e Use Category 2 for signal ports and Category 3 for power supply ports.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eLogistics \u0026amp; Warranty Assurance\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Speed:\u003c\/strong\u003e Guaranteed dispatch within \u003cstrong\u003e24-48 hours\u003c\/strong\u003e from order confirmation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlobal Carriers:\u003c\/strong\u003e Express delivery worldwide via \u003cstrong\u003eFedEx\u003c\/strong\u003e, \u003cstrong\u003eUPS\u003c\/strong\u003e, and \u003cstrong\u003eDHL\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty Period:\u003c\/strong\u003e Full \u003cstrong\u003e12-month professional warranty\u003c\/strong\u003e on all industrial hardware.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Contents:\u003c\/strong\u003e One \u003cstrong\u003eAllen-Bradley \u003cspan style=\"color: #ff0000;\"\u003e1794-IF8IH\u003c\/span\u003e\u003c\/strong\u003e module in secure ESD packaging.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eBuyer Selection Guide\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEnsure your terminal base supports 3-wire or 2-wire shielding to prevent HART signal interference.\u003c\/li\u003e\n\u003cli\u003eCalculate the thermal load if mounting multiple \u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003e1794-IF8IH\u003c\/span\u003e\u003c\/strong\u003e modules in a single non-ventilated cabinet.\u003c\/li\u003e\n\u003cli\u003eVerify that your Flex I\/O Adapter (e.g., 1794-AENTR) firmware version supports HART pass-through data.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eExpert FAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the primary advantage of Sigma-Delta conversion in the \u003cspan style=\"color: #ff0000;\"\u003e1794-IF8IH\u003c\/span\u003e?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSigma-Delta technology provides high-resolution oversampling, which significantly reduces electronic noise and improves the linearity of analog-to-digital conversion compared to older methods.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this module require a specific type of cable for HART communication?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, we strongly recommend using individual shielded twisted-pair cables. This prevents crosstalk between the high-frequency HART digital carriers on adjacent channels.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the \u003cspan style=\"color: #ff0000;\"\u003e1794-IF8IH\u003c\/span\u003e operate without an external DC power supply?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo, the module requires a dedicated 24V DC (19.2-31.2V) external source to power the analog circuitry and HART modems independently of the Flexbus.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the isolation feature benefit a hazardous area installation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIsolation prevents fault currents in one area from propagating to the controller, which is critical for maintaining safety integrity in Class I Div 2 environments.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I mix HART and non-HART devices on the same \u003cspan style=\"color: #ff0000;\"\u003e1794-IF8IH\u003c\/span\u003e module?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, each channel is independent. Non-HART 4-20mA devices will function as standard analog inputs, while HART-enabled devices will provide additional data layers.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":45014041755830,"sku":"1794-IF8IH","price":162.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/1794-IF8IH_8994e77e-7e14-4d95-8515-22f99c5d841d.jpg?v=1776755718","url":"https:\/\/www.plcsparehub.com\/products\/1794-if8ih-allen-bradley-flex-i-o-hart-analog-input-module","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}