{"product_id":"allen-bradley-1794-ie8h-b-flex-i-o-analog-hart-input-module","title":"Allen-Bradley 1794-IE8H\/B FLEX I\/O Analog HART Input Module","description":"\u003ch2\u003eAllen-Bradley 1794-IE8H\/B FLEX I\/O Analog HART Input Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for analog field signal acquisition in the Allen-Bradley FLEX I\/O system, the \u003cstrong\u003eAllen-Bradley 1794-IE8H\/B\u003c\/strong\u003e (\u003cstrong\u003e1794-IE8H\u003c\/strong\u003e Analog HART Input Module) provides direct physical and electrical execution for 4-20 mA and voltage input measurement with integrated HART communication capability.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\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\u003e1794-IE8H\/B\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\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eAnalog HART Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eFLEX I\/O Series B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Inputs\u003c\/td\u003e\n\u003ctd\u003e8 single-ended analog input channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Signal Range\u003c\/td\u003e\n\u003ctd\u003e4-20 mA, 0-20 mA, 0 to +10 V DC, +\/-10 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHART Communication\u003c\/td\u003e\n\u003ctd\u003eHART Protocol Revision 5, 6, and 7 compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e16-bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Format\u003c\/td\u003e\n\u003ctd\u003e2's complement integer, left-justified integer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Input Impedance\u003c\/td\u003e\n\u003ctd\u003e\u0026gt; 100 kOhm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Input Impedance\u003c\/td\u003e\n\u003ctd\u003e250 Ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003e0.1% full scale at 25 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlexBus Current\u003c\/td\u003e\n\u003ctd\u003e80 mA at 5 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal Power Supply\u003c\/td\u003e\n\u003ctd\u003e24 V DC nominal (10.5-31.2 V DC range)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eMaximum 5.1 W at 31.2 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e850 V DC tested for 1 s between system and user side\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 deg C to +55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temp\u003c\/td\u003e\n\u003ctd\u003e-40 deg C 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\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eEtherNet\/IP and FLEX I\/O Signal Processing Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe 1794-IE8H\/B operates as an analog acquisition module within the FLEX I\/O architecture. Each of the eight input channels supports single-ended measurement conversion for current and voltage field devices. The module transfers converted analog values through the FLEX I\/O backplane while maintaining HART digital communication paths for compatible smart field instruments.\u003c\/p\u003e\n\u003cp\u003eThe Series B hardware revision provides updated component implementation compared with previous module revisions. Each channel incorporates an internal FSK HART modem, enabling secondary HART variable access and device diagnostic data transfer without external multiplexers or additional signal wiring.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1794-IE8H\/B support HART communication on every input channel?\u003cbr\u003eA: Yes. Each of the eight analog input channels includes an integrated FSK modem for HART communication. The module supports HART Protocol Revision 5, 6, and 7 devices.\u003c\/p\u003e\n\u003cp\u003eQ: What is the FLEX I\/O backplane current requirement of this module?\u003cbr\u003eA: The module requires 80 mA from the FLEX I\/O backplane at 5 V DC.\u003c\/p\u003e\n\u003cp\u003eQ: What are the supported analog input signal types?\u003cbr\u003eA: The module accepts current inputs including 4-20 mA and 0-20 mA, and voltage inputs including 0 to +10 V DC and +\/-10 V DC.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInstall the module on the designated FLEX I\/O terminal base assembly and verify correct mechanical engagement before applying power.\u003c\/li\u003e\n\u003cli\u003eSeparate analog signal wiring from high-current conductors and switching power cables to reduce electromagnetic interference.\u003c\/li\u003e\n\u003cli\u003eUse shielded instrumentation cable for analog field connections where required by installation standards.\u003c\/li\u003e\n\u003cli\u003eConnect cable shields according to the control cabinet grounding scheme and avoid multiple shield grounding points that may create ground loops.\u003c\/li\u003e\n\u003cli\u003eVerify external 24 V DC supply polarity and voltage range before module energization.\u003c\/li\u003e\n\u003cli\u003eConfirm field device output configuration matches the selected input range before commissioning.\u003c\/li\u003e\n\u003cli\u003eFor HART-enabled devices, maintain proper loop wiring conditions to allow FSK communication signals to coexist with the analog current signal.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43768327897178,"sku":"1794-IE8H\/B","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1794-IE8H1.jpg?v=1785484912","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1794-ie8h-b-flex-i-o-analog-hart-input-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}