{"product_id":"1794-ib8-flex-i-o-8-point-digital-sink-input-module-allen-bradley","title":"1794-IB8 FLEX I\/O 8-Point Digital Sink Input Module | Allen-Bradley","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1794-IB8\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eacts as a high-performance discrete input interface within the FLEX I\/O distributed system. This module interfaces 24V DC field-side devices—such as limit switches, proximity sensors, and push buttons—directly to the industrial control network. We supply this unit as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New and Original\u003c\/strong\u003e, ensuring your automated lines utilize factory-certified components for maximum signal integrity. Its modular, \"cold-swap\" compatible design allows for efficient system expansion without disrupting existing backplane wiring.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification Details\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\u003eNumber of Inputs\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e8 Current Sinking\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOn-state Voltage Range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e10V DC to 31.2V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOn-state Current (Min\/Max)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2.0mA \/ 12.0mA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOff-state Voltage (Max)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e5.0V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOff-state Current (Max)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1.5mA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNominal Input Impedance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4.6 kΩ\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\u003e20mA @ 5V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePower Dissipation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3.5W @ 31.2V DC (Max)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.19 lbs (0.09 kg)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Density Distributed Architecture:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 1794-IB8 provides 8 discrete points in a compact footprint. This allows engineers to decentralize control logic and place I\/O closer to the field sensors, significantly reducing copper wiring costs and enclosure size requirements.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eBroad Voltage Tolerance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThis module supports a wide on-state voltage range from 10V to 31.2V DC. This flexibility ensures stable signal detection during battery-backed operations or in facilities with fluctuating DC power bus levels.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eEfficient Heat Dissipation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe circuitry limits power dissipation to a maximum of 3.5W. This low thermal output prevents localized hot spots within the terminal base, protecting adjacent modules and extending the MTBF (Mean Time Between Failures) of the entire I\/O rack.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSimplified Terminal Base Mounting:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module snaps directly onto 1794-TB2, -TB3, or -TBN terminal bases. This separation of the electronic module from the wiring base permits \"Removal and Insertion Under Power\" (RIUP), allowing maintenance teams to replace a module without powering down the entire I\/O network.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between Sinking and Sourcing inputs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 1794-IB8 uses a \"Current Sinking\" configuration. This means the module provides the path to ground for the field device. You must connect your sensors so that they \"Source\" power from the +24V DC bus into the 1794-IB8 input terminals.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIs this a Brand New unit or a refurbished surplus part?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWe guarantee this 1794-IB8 is\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New and Original\u003c\/strong\u003e. It ships in the manufacturer’s original factory packaging. This ensures the internal optoisolators and gold-plated backplane pins possess their full service life, which is critical for long-term signal reliability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the 1794-IB8 require a separate power supply for the inputs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. While the Flexbus provides 5V DC for the module's internal logic, you must provide external 24V DC power to the terminal base to power the field-side input circuits and the sensors themselves.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan I replace a 1794-IB16 with a 1794-IB8?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhile they share the same voltage characteristics, the 1794-IB8 only provides half the channel density. You would need to reconfigure your PLC I\/O mapping and likely rewire the terminal base. For direct replacement, always match the point count of the original module.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52774722076981,"sku":"1794-IB8","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/1794-IB8.jpg?v=1776836739","url":"https:\/\/www.5gplc.com\/products\/1794-ib8-flex-i-o-8-point-digital-sink-input-module-allen-bradley","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}