{"product_id":"1794-ie8-allen-bradley-flex-i-o-8-channel-analog-input-module","title":"1794-IE8 Allen-Bradley FLEX I\/O 8-Channel Analog Input Module","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview and Distributed I\/O Efficiency\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-IE8 (1794IE8)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a high-density analog input module designed for the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eFLEX I\/O\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eplatform, one of the most successful distributed I\/O systems in industrial history. Engineered for modularity and space efficiency, this module provides\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e8 non-isolated inputs\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ethat can be individually configured for either voltage or current signals. The\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-IE8\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis an essential component for high-point-count systems in water treatment, chemical processing, and HVAC control, where mounting I\/O closer to the field sensors is required to reduce wiring costs. By utilizing a separate terminal base, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-IE8\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eallows for \"Removal and Insertion Under Power\" (RIUP), ensuring that maintenance can be performed without shutting down the entire control network.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eHardware Architecture and Signal Flexibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-IE8\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003einterfaces with the network (EtherNet\/IP, ControlNet, or DeviceNet) via a FLEX I\/O adapter. Its design separates the electronic module from the field wiring, providing a clean and serviceable installation.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eConfigurable Input Ranges:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSupports standard industrial signals including\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e4 to 20 mA\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e0 to 20 mA\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efor current loops, as well as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e+\/- 10 V\u003c\/strong\u003e,\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e0 to 10 V\u003c\/strong\u003e, and\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e0 to 5 V\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efor voltage inputs.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eA\/D Conversion:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eEmploys a 12-bit successive approximation converter, delivering a resolution of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1.22 uA\/count\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efor current and\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e2.56 mV\/count\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efor voltage (at 10 V range).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eModular Mounting:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSnaps easily onto a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-TB2, 1794-TB3, or 1794-TB3S\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eterminal base, which contains the wiring points and the communication backplane.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eData Format:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePresents data to the controller in a 16-bit 2's complement integer format, facilitating easy scaling within Logix Designer or RSLogix 5000 routines.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e1794-IE8\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eAllen-Bradley \/ Rockwell Automation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNumber of Inputs\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e8 Single-ended, Non-isolated\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eResolution\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e12-bit\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCurrent Inputs\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4 to 20 mA, 0 to 20 mA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eVoltage Inputs\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e+\/- 10 V, 0 to 10 V, 0 to 5 V, 1 to 5 V\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eConversion Rate\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e256 microseconds for all channels\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eFlexbus Current\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e20 mA @ 5 VDC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eExternal DC Power\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e24 VDC Nominal (10.5 to 31.2 VDC range)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 55 Celsius\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eShipping Weight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e0.8 kg\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eIntegrated Technical FAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I switch between voltage and current modes on the 1794-IE8?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMode selection is handled via the module's\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003econfiguration word\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ein the controller software. There are no physical jumpers on the module itself; you simply set the bits in the output image of the I\/O adapter to define the signal type for each channel.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the advantage of using a Terminal Base (e.g., 1794-TB3) with this module?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe terminal base allows you to wire the sensors once and leave them in place. If the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-IE8\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eelectronics fail, you can pull the module off the base and snap on a new one without touching a single screwdriver, drastically reducing Mean Time to Repair (MTTR).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this module provide power to 2-wire transmitters?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-IE8\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003emodule itself does not provide loop power. When using 2-wire transmitters, you must use a terminal base like the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-TB3\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewhich has extra terminals to distribute the 24 VDC field power to the sensors.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eEngineering \u0026amp; Installation Protocols\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTerminal Base Alignment:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWhen installing the module, align the keys on the bottom of the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-IE8\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewith the slots on the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-TB3\u003c\/strong\u003e. Press firmly until the latching mechanism clicks. An improperly seated module can lead to intermittent \"I\/O Connection Faults\" on the network.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCurrent Loop Protection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWhen configuring channels for\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e4 to 20 mA\u003c\/strong\u003e, ensure that the external 24 V power supply is stable. The module has a maximum input current rating of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e32 mA\u003c\/strong\u003e; exceeding this can damage the internal precision resistors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eShield Termination:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFor analog accuracy, use shielded cables and terminate the shield at the ground lugs provided on the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-TBC\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eor the grounded DIN rail. Avoid grounding both ends of the shield to prevent ground loops that induce 50\/60 Hz ripple into the 12-bit conversion.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eEngineering Advantages\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1794-IE8\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003estands out for its\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ehigh-speed throughput\u003c\/strong\u003e. With a conversion rate of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e256 microseconds\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efor all 8 channels, it provides near-real-time data for fast-acting control loops. Its non-isolated design is a cost-effective choice for systems where all sensors share a common reference point, allowing for high-density analog acquisition without the bulk or expense of isolated modules. Its compatibility across all major industrial networks ensures it remains a flexible asset in both legacy PLC-5\/SLC systems and modern ControlLogix architectures.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52695193092459,"sku":"1794-IE8","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/allen-bradley-1794-ie8-flex-8-point-analog-input-module-s5wdi0m1zcf_873ae131-d7ea-4994-beaf-7a00c295ad4a.jpg?v=1766114705","url":"https:\/\/www.plcprotech.com\/products\/1794-ie8-allen-bradley-flex-i-o-8-channel-analog-input-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}