{"product_id":"allen-bradley-1794-ie8h-flex-i-o-hart-analog-input-module","title":"Allen-Bradley 1794-IE8H FLEX I\/O HART Analog Input Module","description":"\u003cp\u003eThe \u003cstrong\u003e1794-IE8H\u003c\/strong\u003e is an 8-channel analog input module engineered by Allen-Bradley for the FLEX I\/O distributed system. Designed with native Highway Addressable Remote Transducer (HART) protocol capability, it enables simultaneous process variable measurement and digital communication with smart field instruments. The open-style module mounts onto compatible terminal bases on DIN rails, delivering precision process data to host controllers via FLEX I\/O communication adapters.\u003c\/p\u003e\n\u003ch3\u003eAnalog Channel Configuration and HART Integration\u003c\/h3\u003e\n\u003cp\u003eThe module features 8 single-ended, non-isolated input channels supporting current and voltage signal ranges (such as 4–20 mA, 0–20 mA, ±10V, and 0–10V) digitized via a 16-bit successive approximation analog-to-digital converter. Its built-in HART modem multiplexes digital diagnostic and configuration data over the analog loops without requiring external multiplexer hardware. This configuration streamlines system wiring for transmitters, flow meters, and analytical sensors.\u003c\/p\u003e\n\u003ch3\u003eTerminal Base Compatibility and Power Requirements\u003c\/h3\u003e\n\u003cp\u003eOperation requires an external 24 VDC nominal power supply (ranging from 19.2 to 31.2 VDC) and a dedicated terminal base, specifically the \u003cstrong\u003e1794-TB3G\u003c\/strong\u003e or \u003cstrong\u003e1794-TB3GS\u003c\/strong\u003e. These specialized terminal bases provide the grounding and shielding architecture necessary to maintain signal integrity and prevent ground loops in noisy industrial environments. The module supports Removal and Insertion Under Power (RIUP), allowing maintenance personnel to replace units without powering down the entire I\/O rack.\u003c\/p\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\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\u003e1794-IE8H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley (Rockwell Automation)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eFLEX I\/O (Bulletin 1794)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eHART Analog Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Inputs\u003c\/td\u003e\n\u003ctd\u003e8 single-ended, non-isolated channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Signal Ranges\u003c\/td\u003e\n\u003ctd\u003e4–20 mA, 0–20 mA, ±10V, 0–10V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e16-bit A\/D conversion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Protocol\u003c\/td\u003e\n\u003ctd\u003eHART enabled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal DC Power Supply\u003c\/td\u003e\n\u003ctd\u003e24 VDC nominal (19.2...31.2 VDC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlexBus Current\u003c\/td\u003e\n\u003ctd\u003e80 mA at 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAbsolute Accuracy\u003c\/td\u003e\n\u003ctd\u003e±0.1% full scale at 20 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Terminal Base\u003c\/td\u003e\n\u003ctd\u003e1794-TB3G or 1794-TB3GS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Options\u003c\/td\u003e\n\u003ctd\u003e35 mm DIN rail mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure Rating\u003c\/td\u003e\n\u003ctd\u003eOpen style \/ IP20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 °C to 55 °C (32 °F to 131 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.70 lbs (0.32 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003cp\u003eFrequently Asked Questions\u003c\/p\u003e\n\u003cp\u003eQ: What terminal bases must be used with the 1794-IE8H module?A: The 1794-IE8H requires either the \u003cstrong\u003e1794-TB3G\u003c\/strong\u003e or \u003cstrong\u003e1794-TB3GS\u003c\/strong\u003e terminal base, which includes specialized grounding connections to support HART signal shielding.\u003c\/p\u003e\n\u003cp\u003eQ: Does the 1794-IE8H isolate individual input channels from one another?A: No, the 8 input channels are single-ended and non-isolated from each other, though a basic 50 V continuous isolation barrier is maintained between the field side and the system.\u003c\/p\u003e\n\u003cp\u003eQ: How does the module communicate HART data from field instruments?A: The module integrates an internal HART modem that extracts digital diagnostic variables and device parameters directly from the 4–20 mA analog loops, passing the data through the FLEX I\/O backplane to the controller.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":67146976788595,"sku":"1794-IE8H","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/1794-OB32P_2_c711ea8d-7d18-4da9-a6b9-ab3db5ac0872.jpg?v=1794196512","url":"https:\/\/www.dcssupplier.com\/products\/allen-bradley-1794-ie8h-flex-i-o-hart-analog-input-module","provider":"DcsSupplier Limited","version":"1.0","type":"link"}