{"product_id":"allen-bradley-1756-ob16d-controllogix-16-point-diagnostic-digital-output-module","title":"Allen-Bradley 1756-OB16D ControlLogix 16-Point Diagnostic Digital Output Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-OB16D\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eoperates as an intelligent 16-point diagnostic digital output module for the Allen-Bradley ControlLogix system. This module provides 24V DC sourcing outputs with advanced onboard monitoring capabilities, allowing the controller to detect field-side faults such as short circuits, no-load conditions, and output verification failures. We supply this unit as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eoriginal stock, ensuring your automation architecture maintains maximum fault visibility and operational safety.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThe 1756-OB16D utilizes high-precision diagnostics and robust electrical ratings for industrial control:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOutputs:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e16 Diagnostic Sourcing Outputs (8 points per group)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eVoltage Category:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e24V DC Source\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOperating Voltage Range:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e19.2 to 30V DC\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eBackplane Current Draw:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e250 mA @ 5.1V DC \/ 140 mA @ 24V DC\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTotal Backplane Power:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e4.64 W\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eThermal Dissipation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e11.25 BTU\/hr\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eShort Trip Protection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e8 A for 180 ms (min) \/ 10 A for 120 ms (min)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDiagnostic Timestamp Accuracy:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e±1 ms\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIsolation Voltage:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e250V continuous (Basic insulation between outputs and backplane)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eScheduled Outputs:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSynchronization within 16.7 s max via Coordinated System Time (CST)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e2 kg\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePredictive Fault Detection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 1756-OB16D monitors both On-state and Off-state conditions. It identifies an \"Open Load\" when the output is Off and verifies the load presence when the output is On. This proactive monitoring allows maintenance teams to replace failing actuators before a complete process shutdown occurs.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePrecision Diagnostic Timestamping:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module assigns a ±1 ms timestamp to every diagnostic event. This accuracy allows engineers to perform high-resolution sequence-of-events (SOE) analysis, helping to pinpoint the exact root cause of intermittent electrical faults in high-speed machinery.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eConfigurable Pulse Testing:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe hardware executes sub-millisecond pulse tests to verify output circuit integrity without actually energizing the load. You can configure the maximum pulse width to ensure compatibility with sensitive field devices, preventing accidental triggering while maintaining safety coverage.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Current Surge Handling:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe integrated \"Short Trip\" logic manages high inrush currents typical of large solenoid valves or DC contactors. It allows up to 10 A for 120 ms, preventing nuisance tripping during the initial energization phase while still providing rapid short-circuit protection for the wiring.\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\u003eIs the 1756-OB16D provided as a brand new original unit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. We supply this module strictly as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eoriginal factory equipment. It arrives in the original Allen-Bradley packaging with all factory seals intact to ensure 100% diagnostic reliability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan the 1756-OB16D detect a blown fuse in the field?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. By utilizing the \"Output Verification\" and \"No Load\" diagnostic features, the module identifies if power fails to reach the load. If a field-side fuse blows, the module immediately reports a diagnostic fault to the controller and triggers the corresponding status LED.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this module require a specific Removable Terminal Block (RTB)?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 1756-OB16D requires a 36-pin RTB due to the wiring density of the diagnostic groups. We recommend the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-TBCH\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(Cage Clamp) or\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-TBSH\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(Spring Clamp) for secure industrial terminations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHow does \"Scheduled Output\" synchronization benefit my application?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis feature synchronizes all outputs within 16.7 seconds relative to the Coordinated System Time (CST). This is critical for applications requiring precise multi-axis coordination or time-stamped control actions across multiple chassis in a distributed ControlLogix network.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":53276795240632,"sku":"1756-OB16D","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/1756-OB16I_ac147d68-4630-42e5-84f4-42b8be4abed7.jpg?v=1775640466","url":"https:\/\/www.globalpetroparts.com\/products\/allen-bradley-1756-ob16d-controllogix-16-point-diagnostic-digital-output-module","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}