{"product_id":"allen-bradley-1756-oa8d-controllogix-diagnostic-output-module","title":"Allen-Bradley 1756-OA8D ControlLogix Diagnostic Output Module","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1756-OA8D\u003c\/strong\u003e is a ControlLogix 120V AC diagnostic output module designed for high-reliability industrial automation environments. Operating as an 8-point electronically fused output device, it provides comprehensive point-level diagnostic detection—including open wire, field power loss, blown fuse, no load, and output verification faults—to ensure optimal operational integrity across PLC, DCS, and automated process control systems.\u003c\/p\u003e\n\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1756-OA8D\u003c\/strong\u003e ControlLogix output module delivers solid-state switching for 120V AC field devices. Operating within a voltage range of 74 to 132V AC (47 to 63 Hz), the module features 8 diagnostic output points arranged in two groups of 4 points. It utilizes Producer\/Consumer technology to share output status and comprehensive diagnostic data seamlessly across the ControlLogix backplane.\u003c\/p\u003e\n\u003cp\u003eEngineered for critical industrial applications, the \u003cstrong\u003e1756-OA8D\u003c\/strong\u003e provides advanced diagnostic reporting to identify field wiring issues, short circuits, or power disruptions. Off-state detection identifies no-load conditions, while on-state output verification ensures commanded states match actual field conditions. Individual electronic fusing helps protect each output point against overcurrent and short-circuit events.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e8 diagnostic output channels organized into 2 isolated groups of 4 points each.\u003c\/li\u003e\n\u003cli\u003ePoint-level diagnostic features including FuseBlown, NoLoad, OutputVerifyFault, and FieldPwrLoss.\u003c\/li\u003e\n\u003cli\u003eIndividual electronic fusing per output point.\u003c\/li\u003e\n\u003cli\u003eConfigurable output states in Program Mode and Fault Mode (Hold Last State, On, or Off).\u003c\/li\u003e\n\u003cli\u003eCoordinated System Time (CST) timestamping for diagnostic event tracking.\u003c\/li\u003e\n\u003cli\u003eSupport for Scheduled Outputs with CST synchronization.\u003c\/li\u003e\n\u003cli\u003eElectronic keying via software configuration to prevent module misplacement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDiscrete AC actuator and valve control\u003c\/li\u003e\n\u003cli\u003eMotor starter and contactor switching\u003c\/li\u003e\n\u003cli\u003eIndustrial process output control\u003c\/li\u003e\n\u003cli\u003eSafety signaling and indicator control\u003c\/li\u003e\n\u003cli\u003eAutomated manufacturing systems\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\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley \/ Rockwell Automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8 diagnostic, electronic fusing (4 points\/group)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVoltage Category\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e120V AC 50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Voltage Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e74…132V AC, 47…63 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Delay Time (Off to On \/ On to Off)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e9.3 ms @ 60 Hz, 11 ms @ 50 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCurrent Draw @ 5.1V DC\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e175 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCurrent Draw @ 24V DC\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e250 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTotal Backplane Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6.89 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Dissipation, Max\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5.3 W @ 60 degC (140 degF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThermal Dissipation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e18.0 BTU\/hr\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOff-State Leakage Current, Max\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3 mA per point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOn-State Voltage Drop, Max\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.5V peak @ 0.5 A; 3V peak @ 1 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCurrent per Point, Max\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 A @ 30 degC (86 degF) linear derating; 0.5 A @ 60 degC (140 degF) linear derating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCurrent per Module, Max\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8 A @ 30 degC (86 degF) linear derating; 4 A @ 60 degC (140 degF) linear derating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurge Current per Point\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8 A for 43 ms per point, repeatable every 2 s @ 30 degC (86 degF); 5 A for 43 ms per point, repeatable every 1 s @ 60 degC (140 degF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLoad Current, Min\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10 mA per point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInhibit Voltage, Max\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eZero crossing 25V peak\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIsolation Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e125V (continuous), basic insulation type, outputs-to-backplane, and output group-to-group. No isolation between individual group inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSlot Width\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRemovable Terminal Block (RTB)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1756-TBNH, 1756-TBSH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0…60 degC (32…140 degF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNonoperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-40…+85 degC (-40…+185 degF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelative Humidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5…95% noncondensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVibration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2 g @ 10…500 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Shock\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNonoperating Shock\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e50 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEnclosure Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNone (open style)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNorth American Temp Code\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eT4A\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\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Mounting:\u003c\/strong\u003e Install the module into any available slot in a 1756 ControlLogix chassis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Block Compatibility:\u003c\/strong\u003e Use designated Removable Terminal Blocks (1756-TBNH or 1756-TBSH) for field wiring connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring Specifications:\u003c\/strong\u003e Ensure field wiring uses single wire connections of 0.33…2.1 mm2 (22…14 AWG) or double wire connections of 0.33…1.3 mm2 (22…16 AWG) solid\/stranded shielded copper wire rated at 105 degC or higher.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConductor Category:\u003c\/strong\u003e Follow Wire Category 1 routing recommendations on signal ports according to industrial wiring and grounding guidelines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Derating:\u003c\/strong\u003e When operating in extended or harsh environment systems, ensure all paired chassis and power supply components match the required thermal specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompliance and Certifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ecULus:\u003c\/strong\u003e UL Listed Industrial Control Equipment, certified for US and Canada (UL File E65584); UL Listed for Class I, Division 2 Group A,B,C,D Hazardous Locations (UL File E194810).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCE:\u003c\/strong\u003e European Union 2014\/30\/EU EMC Directive (EN 61326-1, EN 61000-6-2, EN 61000-6-4, EN 61131-2) and 2014\/35\/EU LVD Directive (EN 61131-2).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRCM:\u003c\/strong\u003e Australian Radiocommunications Act, compliant with EN 61000-6-4.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFM:\u003c\/strong\u003e FM Approved Equipment for use in Class I Division 2 Group A,B,C,D Hazardous Locations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKC:\u003c\/strong\u003e Korean Registration of Broadcasting and Communications Equipment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUKCA:\u003c\/strong\u003e Compliant with UK Statutory Instruments for EMC, Safety, Explosive Atmospheres, and RoHS.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMorocco:\u003c\/strong\u003e Compliant with ministerial order regulations for electrical safety and EMC.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52695178477931,"sku":"1756-OA8D","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/allen-bradley-1756-oa8d-diagnostic-digital-ac-output-module-0bupapsp0mq_bfb4a71b-5939-4d47-857a-337f5eb07120.jpg?v=1766114209","url":"https:\/\/www.plcprotech.com\/products\/allen-bradley-1756-oa8d-controllogix-diagnostic-output-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}