{"product_id":"allen-bradley-1794-ib16d-flex-i-o-digital-sinking-input-module-with-diagnostics","title":"Allen-Bradley 1794-IB16D FLEX I\/O Digital Sinking Input Module with Diagnostics","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e1794-IB16D\u003c\/strong\u003e is a high-density discrete hardware component engineered for the \u003cstrong\u003eFLEX I\/O\u003c\/strong\u003e distributed network terminal platform. This 24V DC digital input module is designed to monitor and process binary field conditions while executing comprehensive electronic point-level diagnostics. Operating within a sinking current configuration, the internal circuits route electricity from sourcing field-side instrumentation through its sensing nodes to a centralized common return rail, establishing precise logic state classification and fault isolation across industrial networks.\u003c\/p\u003e\n\u003cp\u003eEquipped with sixteen sinking input channels, the device incorporates advanced electronic diagnostics capable of identifying line faults including open wires, channel short-circuits, and reverse polarity conditions of the external sensor power supply. When an active fault line criteria is met, the \u003cstrong\u003e1794-IB16D\u003c\/strong\u003e logs the corresponding error bit into the system memory registers and illuminates a dedicated front-panel indicators array, notifying the centralized master controller without halting adjacent channel operation. The module interfaces over \u003cstrong\u003eEtherNet\/IP\u003c\/strong\u003e, \u003cstrong\u003eControlNet\u003c\/strong\u003e, or \u003cstrong\u003eDeviceNet\u003c\/strong\u003e backplanes, making it typical in critical process installations—such as continuous petrochemical batching, automated automotive assembly lines, municipal water pumping facilities, and packaging automation networks—where immediate sensor line visibility is mandatory to maintain plant safety and uptime.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSixteen discrete sinking input channels featuring comprehensive point-level electronic diagnostics.\u003c\/li\u003e\n\u003cli\u003eReal-time automated detection of open-wire faults, field short-circuits, and reversed external supply polarity.\u003c\/li\u003e\n\u003cli\u003eStatus reporting parameters that map diagnostic fault bits straight to the controller processor.\u003c\/li\u003e\n\u003cli\u003eSupport for Removal and Insertion Under Power (RIUP) allowing live service without bus downtime.\u003c\/li\u003e\n\u003cli\u003eIndividual front-facing LED matrix providing visual state reporting for both signal logic and fault codes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProcess instrumentation loop tracking with continuous sensor wire path monitoring.\u003c\/li\u003e\n\u003cli\u003eAutomated material handling conveyor systems requiring rapid short-circuit fault identification.\u003c\/li\u003e\n\u003cli\u003eCritical safety interlock switches, emergency gate tracks, and valve position feedback verification.\u003c\/li\u003e\n\u003cli\u003ePetrochemical blending facility sensors deployed in remote, unconditioned electrical panels.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\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\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eRockwell Automation \/ Allen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eFLEX I\/O\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e1794-IB16D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eDigital Sinking Input Module with Diagnostics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Inputs\u003c\/td\u003e\n\u003ctd\u003e16 Channels, Sinking\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Input Voltage\u003c\/td\u003e\n\u003ctd\u003e24V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOn-State Voltage Range\u003c\/td\u003e\n\u003ctd\u003e10V DC to 31.2V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOn-State Current Minimum\u003c\/td\u003e\n\u003ctd\u003e2.0 mA at 10V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOn-State Current Nominal\u003c\/td\u003e\n\u003ctd\u003e8.2 mA at 24V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOn-State Current Maximum\u003c\/td\u003e\n\u003ctd\u003e12.1 mA at 31.2V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOff-State Voltage Maximum\u003c\/td\u003e\n\u003ctd\u003e5.0V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOff-State Current Maximum\u003c\/td\u003e\n\u003ctd\u003e1.5 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Impedance Maximum\u003c\/td\u003e\n\u003ctd\u003e3.1 kilohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensor Power Voltage Drop\u003c\/td\u003e\n\u003ctd\u003e2.2V DC maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlexBus Current Draw\u003c\/td\u003e\n\u003ctd\u003e30 mA at 5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e50V continuous, tested at 850V DC for 1 second between user power and system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Dissipation Maximum\u003c\/td\u003e\n\u003ctd\u003e4.5 W at 31.2V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermal Dissipation Maximum\u003c\/td\u003e\n\u003ctd\u003e15.4 BTU\/hour at 31.2V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 55 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to 85 degC\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\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.10 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e46 mm x 94 mm x 53 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 Receptacle Node\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eFunction \/ Signal Path Allocation\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eRow A: Terminals 0 to 15\u003c\/td\u003e\n\u003ctd\u003eSinking Input Signal Wire Connections (IN00 to IN15)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRow B: Terminals 17 to 32\u003c\/td\u003e\n\u003ctd\u003eSensor Power Outward Distribution Connections (Sensor Power 0 to 15)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRow C: Terminals 36, 38, 40, 42, 44, 46, 48, 50\u003c\/td\u003e\n\u003ctd\u003eCommon DC Return Reference Nodes (COM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRow C: Terminals 43, 45, 47, 49\u003c\/td\u003e\n\u003ctd\u003eExternal +V2 DC Diagnostic Sensor Power Input Terminals\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\u003eDIN Rail Mounting\u003c\/h3\u003e\n\u003cp\u003eEngage the upper mechanical retention hooks on the back panel of the module housing onto the upper edge of standard zinc-plated 35 mm DIN tracking. Press down and pivot the bottom portion of the enclosure inward until the spring-activated steel latch assembly snaps securely around the lower rail track lip.\u003c\/p\u003e\n\u003ch3\u003eTerminal Base Compatibility and Seating\u003c\/h3\u003e\n\u003cp\u003eMount this module exclusively on a pre-installed \u003cstrong\u003e1794-TB32\u003c\/strong\u003e or \u003cstrong\u003e1794-TB32S\u003c\/strong\u003e terminal base unit. Rotate the terminal base keyswitch clockwise to position 2 before attempting insertion. Align the physical alignment bar on the bottom face of the module with the guide groove on the base, and press firmly until the side latches seat flush.\u003c\/p\u003e\n\u003ch3\u003eField Sensor Wiring\u003c\/h3\u003e\n\u003cp\u003eConnect discrete input signals to Row A terminals 0 through 15. Connect matching sensor power loops to Row B terminals 17 through 32. For 2-wire field devices, use the designated input and sensor power terminals; for 3-wire field devices, connect the device ground lead to the Row C common nodes. Do not connect signals to terminals 16 or 33.\u003c\/p\u003e\n\u003ch3\u003eExternal Diagnostic Power Loop\u003c\/h3\u003e\n\u003cp\u003eSupply external 24V DC operational power into the +V2 terminals (43, 45, 47, or 49) on Row C. This separate power path is required to drive the point-level monitoring electronics and execute continuous open-wire and sensor short-circuit diagnostics.\u003c\/p\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat distinguishes this diagnostic module from the standard 1794-IB16 model?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis module features electronic diagnostic loops that automatically detect open wires, field short-circuits, and external sensor supply reverse polarity conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat terminal base variants must be used with this module?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module requires the high-density layout provided by the 1794-TB32 or 1794-TB32S terminal base units.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the module signal that a sensor wire has been severed?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt triggers a specific channel error bit in the logic register and turns on the front-panel red diagnostic status indicator for that individual channel.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat type of switching configuration is supported by the input points?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe unit features a sinking configuration, meaning it accepts current flowing from external sourcing field instrumentation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this module be hot-swapped during central system run cycles?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, it supports removal and insertion under power, allowing live module swaps without halting network communications on the local rail segment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat voltage threshold constitutes a logical off-state for an input channel?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAn input channel reads as an off-state condition when the incoming voltage drops below 5.0V DC or the loop current drops below 1.5 mA.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs separate external power required to enable the channel diagnostic loops?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, external 24V DC must be connected to the +V2 terminal paths on Row C to power the onboard field diagnostics.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the function of the Row B terminals on the 1794-TB32 base?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThey provide individual diagnostic sensor power terminals for each corresponding input channel, allowing the module to monitor current draw per point.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this unit process high-voltage alternating current field signals?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo, this module is rated exclusively for direct current applications operating inside a 10V DC to 31.2V DC window.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow are the filter times for the inputs adjusted to filter out switch chatter?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe digital filter times can be configured via programming software to match application signal response needs.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52695186014571,"sku":"1794-IB16D","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/allen-bradley-1794-ib16d-flex-16-point-advanced-digital-input-module-403hgkfewdt_6626e74b-fc35-4872-b7bd-0f84742b5807.jpg?v=1766114463","url":"https:\/\/www.plcprotech.com\/bg\/products\/allen-bradley-1794-ib16d-flex-i-o-digital-sinking-input-module-with-diagnostics","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}