{"product_id":"allen-bradley-1797-ie8-analog-input-module","title":"Allen-Bradley 1797-IE8 FLEX Ex Intrinsically Safe Analog Input Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e1797-IE8\u003c\/strong\u003e is an intrinsically safe high-density analog input module designed for direct deployment within hazardous environments as part of the \u003cstrong\u003eFLEX Ex\u003c\/strong\u003e distributed architecture. This component processes standard instrumentation signals from up to eight field transmitters, converting current waveforms into digitized data registers across an isolated internal backplane interface. By maintaining low-energy electrical circuits, the device isolates field-side power configurations from triggering combustion in atmospheres containing flammable gases, vapors, or dust.\u003c\/p\u003e\n\u003cp\u003eThis module houses eight non-isolated analog input channels configured to interface with two-wire or four-wire transmitters over a \u003cstrong\u003e4 to 20 mA\u003c\/strong\u003e signaling range. The \u003cstrong\u003e1797-IE8\u003c\/strong\u003e mounts securely onto a dedicated \u003cstrong\u003eFLEX Ex\u003c\/strong\u003e terminal base, enabling digital communication with host programmable logic controllers via specialized intrinsically safe network adapters supporting \u003cstrong\u003eControlNet Ex\u003c\/strong\u003e protocol configurations. It is commonly implemented in petrochemical processing, off-shore drilling, refinery complexes, and specialty chemical synthesis plants requiring strict explosion-proof engineering compliance.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEight discrete analog channels engineered for intrinsically safe field connections.\u003c\/li\u003e\n\u003cli\u003eDirect processing of industrial standard 4 to 20 mA current loops.\u003c\/li\u003e\n\u003cli\u003eModular plug-in design for efficient terminal base integration and maintenance.\u003c\/li\u003e\n\u003cli\u003eInternal galvanic isolation barriers separating field-side instrumentation from control infrastructure.\u003c\/li\u003e\n\u003cli\u003eIntegrated diagnostic capability to identify open-circuit or short-circuit signal faults.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePetroleum refinery distillation column pressure tracking.\u003c\/li\u003e\n\u003cli\u003eOffshore oil platform combustible gas monitoring systems.\u003c\/li\u003e\n\u003cli\u003eChemical storage tank continuous level measurement.\u003c\/li\u003e\n\u003cli\u003ePharmaceutical solvent batching process temperature control loops.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable style=\"width: 100%; height: 391.876px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 36.3769%; height: 19.5938px;\"\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 60.2898%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.3769%; height: 19.5938px;\"\u003eManufacturer\u003c\/td\u003e\n\u003ctd style=\"width: 60.2898%; height: 19.5938px;\"\u003eRockwell Automation \/ Allen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.3769%; height: 19.5938px;\"\u003eBrand\u003c\/td\u003e\n\u003ctd style=\"width: 60.2898%; height: 19.5938px;\"\u003eFLEX Ex\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.3769%; height: 19.5938px;\"\u003ePart Number\u003c\/td\u003e\n\u003ctd style=\"width: 60.2898%; height: 19.5938px;\"\u003e1797-IE8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.3769%; height: 19.5938px;\"\u003eModule Type\u003c\/td\u003e\n\u003ctd style=\"width: 60.2898%; height: 19.5938px;\"\u003eIntrinsically Safe Analog Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.3769%; height: 19.5938px;\"\u003eNumber of Inputs\u003c\/td\u003e\n\u003ctd style=\"width: 60.2898%; height: 19.5938px;\"\u003e8 Channels, Non-isolated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.3769%; height: 19.5938px;\"\u003eSignal Range\u003c\/td\u003e\n\u003ctd style=\"width: 60.2898%; height: 19.5938px;\"\u003e4 to 20 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.3769%; height: 19.5938px;\"\u003eResolution\u003c\/td\u003e\n\u003ctd style=\"width: 60.2898%; height: 19.5938px;\"\u003e16 bits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.3769%; height: 19.5938px;\"\u003eInput Impedance\u003c\/td\u003e\n\u003ctd style=\"width: 60.2898%; height: 19.5938px;\"\u003e200 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 36.3769%; height: 39.1875px;\"\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd style=\"width: 60.2898%; height: 39.1875px;\"\u003eGalvanic isolation between field side and FlexBus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.3769%; height: 19.5938px;\"\u003ePower Consumption\u003c\/td\u003e\n\u003ctd style=\"width: 60.2898%; height: 19.5938px;\"\u003e6.5 W maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003ctd style=\"width: 36.3769%; height: 39.1875px;\"\u003eIntrinsically Safe Output Type\u003c\/td\u003e\n\u003ctd style=\"width: 60.2898%; height: 39.1875px;\"\u003eCurrent-limited source parameters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.3769%; height: 19.5938px;\"\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd style=\"width: 60.2898%; height: 19.5938px;\"\u003e-20 to 60 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.3769%; height: 19.5938px;\"\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd style=\"width: 60.2898%; height: 19.5938px;\"\u003e-40 to 85 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.3769%; height: 19.5938px;\"\u003eRelative Humidity\u003c\/td\u003e\n\u003ctd style=\"width: 60.2898%; height: 19.5938px;\"\u003e5% to 95% non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.3769%; height: 19.5938px;\"\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd style=\"width: 60.2898%; height: 19.5938px;\"\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.3769%; height: 19.5938px;\"\u003eApproximate Weight\u003c\/td\u003e\n\u003ctd style=\"width: 60.2898%; height: 19.5938px;\"\u003e0.20 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.3769%; height: 19.5938px;\"\u003eApproximate Dimensions\u003c\/td\u003e\n\u003ctd style=\"width: 60.2898%; height: 19.5938px;\"\u003e46 mm x 94 mm x 91 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eConnections\/Interfaces\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eTerminal Base Pin (Typical 1797-TB3)\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput 0 (+) to Input 7 (+)\u003c\/td\u003e\n\u003ctd\u003eAnalog Input Current Signal Connections\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReturn 0 (-) to Return 7 (-)\u003c\/td\u003e\n\u003ctd\u003eSignal Common Return Paths\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+V Ex\u003c\/td\u003e\n\u003ctd\u003eIntrinsically Safe Transmitters Power Feed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003ch3\u003eHazardous Area Precautions\u003c\/h3\u003e\n\u003cp\u003eVerify all installation procedures comply with local national electrical codes for hazardous locations. Ensure the module is mated exclusively with an approved intrinsically safe \u003cstrong\u003eFLEX Ex\u003c\/strong\u003e terminal base to maintain appropriate energy-limiting protective parameters.\u003c\/p\u003e\n\u003ch3\u003eDIN Rail Installation\u003c\/h3\u003e\n\u003cp\u003eHook the top of the module chassis into the upper channel slot of the standard 35 mm DIN rail. Rotate the body downward with consistent force until the low-side locking tabs engage with the metallic track lip.\u003c\/p\u003e\n\u003ch3\u003eShielding and Grounding\u003c\/h3\u003e\n\u003cp\u003eTerminate all instrumentation cable shields at the dedicated chassis ground bar provided on the terminal base assembly. Do not ground the cable shield at both ends of the run to prevent creating a ground loop inside the hazardous zone.\u003c\/p\u003e\n\u003ch3\u003eThermal Management\u003c\/h3\u003e\n\u003cp\u003eAllow a minimum of 50 mm clearance on all sides of the terminal stack to facilitate natural air circulation. Confirm that the enclosure ventilation keeps ambient temperatures near the module body below 60 degC during maximum load conditions.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the core function of this hardware components?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt provides an interface to receive and digitize analog signals from field transmitters located in explosive atmospheres while preventing ignition energies.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this module require an external zener barrier?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo, the module features built-in galvanic isolation and energy-limiting circuits designed to operate directly with field devices in hazardous zones.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this device measure voltage inputs like 0 to 10V?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo, this specific model is engineered exclusively to accept and process standard 4 to 20 mA current loop signals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat terminal base is compatible with this unit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt is designed to plug directly into the 1797-TB3 or 1797-TB3S intrinsically safe terminal base units.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this unit be swapped out while the network adapter is active?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, it supports removing and replacing modules under power within hazardous areas when used with appropriate FLEX Ex terminal structures.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the controller detect an unplugged sensor wire?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module registers an under-range fault parameter when the input current drops significantly below the standard 4 mA threshold.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre the eight input channels electrically isolated from one another?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe eight channels share a common internal reference within the module, though the group is isolated from the main control backplane.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat communication protocol does the module use to talk to the PLC?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt sends data across the local backplane to a 1797 network adapter, which typically links to the main controller via a ControlNet Ex network.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs calibration required before deploying the unit into service?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe hardware undergoes factory calibration before shipment, but electronic zero and span parameters can be adjusted via controller software.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the maximum operating temperature limit for this component?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe unit is specified to operate reliably in ambient industrial environments ranging up to 60 degC without active cooling.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52695186440555,"sku":"1797-IE8","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/allen-bradley-1797-ie8-analog-input-module-d11sn1wenji_359bcb73-bffa-4a4a-925f-21647403f4f2.jpg?v=1766114479","url":"https:\/\/www.plcprotech.com\/products\/allen-bradley-1797-ie8-analog-input-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}