{"product_id":"1794-ob16d-allen-bradley-flex-i-o-16-point-diagnostic-output-module","title":"1794-OB16D | Allen-Bradley Flex I\/O 16-Point Diagnostic Output Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1794-OB16D\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eoperates as a high-density, smart discrete output interface for the Flex I\/O platform. It provides 16 non-isolated sourcing outputs designed to drive solenoids, motor starters, and indicators. Unlike standard output modules, the \"D\" variant includes advanced onboard diagnostics, including open-wire detection and short-circuit protection. We supply this module as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New and Original\u003c\/strong\u003e, ensuring your automated systems benefit from factory-sealed component integrity and precise fault monitoring.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThe 1794-OB16D manages high-current loads while maintaining a low thermal footprint within the enclosure.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eFeature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\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\u003eManufacturer\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAllen-Bradley \/ Rockwell Automation\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModule Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eDiagnostic Digital Output Module\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNumber of Outputs\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e16 Channels (Sourcing)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNominal Voltage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e24V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eVoltage 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\u003eOutput Current Rating\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e8.0 A per module (0.5 A per channel max)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSurge Current\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2 A for 50 ms (repeatable every 2s)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOn-State Voltage Drop\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.5V DC (Maximum)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOff-State Leakage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.5 mA (Maximum)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eIsolation Voltage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e50V Continuous (Basic Insulation)\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\u003e4.8 W @ 31.2V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSignal Delay (On\/Off)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.5 ms \/ 0.5 ms\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\u003eIntegrated Circuit Protection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module features thermal shutdown capabilities with an auto-reset function. It automatically detects short circuits when the output port voltage drops below 2V despite an active signal. This prevents hardware damage and reduces the need for manual fuse replacements in the field.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eProactive Fault Diagnostics:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 1794-OB16D identifies open-wire conditions during the off-state using a 0.1 mA leakage current. This allows the controller to detect a broken cable or disconnected load before the machine attempts to initiate a cycle, preventing unexpected process stops.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eReverse Polarity Safeguards:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe internal circuitry detects reverse polarity in the external power supply (minimum 10V). This safeguard prevents catastrophic module failure caused by wiring errors during initial commissioning or field maintenance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRapid Signal Response:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWith an 0.5 ms switching delay for both \"Off-to-On\" and \"On-to-Off\" transitions, this module supports high-speed application requirements. It ensures precise timing for sorting, packaging, and high-frequency valve control.\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\u003eWhich terminal bases work with the 1794-OB16D?\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eYou should mount this module on a 1794-TB2, 1794-TB3, or 1794-TB3S terminal base. The 1794-TB3 is generally preferred for applications requiring additional common and power terminations for field devices.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this module for high-inrush loads like large DC contactors?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The module handles a surge current of 2 A for 50 ms. Ensure the steady-state current does not exceed 0.5 A per channel and the total module current stays below 8.0 A to avoid triggering thermal shutdown.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the auto-reset feature work after a short circuit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOnce the module detects a short, it enters thermal shutdown to protect the switching transistor. After the circuit cools and you remove the fault condition, the module automatically resets and resumes normal operation without requiring a power cycle or software reset.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the primary benefit of the \"D\" diagnostic version over the standard 1794-OB16?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 1794-OB16D provides \"Open Wire\" and \"Short Circuit\" status bits to the PLC. This allows the HMI to display specific fault locations, drastically reducing the Mean Time to Repair (MTTR) by pinpointing the exact failed channel or cable.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52587626234165,"sku":"1794-OB16D","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/1794-OB16D.jpg?v=1776409329","url":"https:\/\/www.5gplc.com\/products\/1794-ob16d-allen-bradley-flex-i-o-16-point-diagnostic-output-module","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}