{"product_id":"1756-oa8d-allen-bradley-controllogix-8-point-diagnostic-ac-output-module","title":"1756-OA8D Allen-Bradley ControlLogix 8-Point Diagnostic AC Output Module","description":"\u003ch3\u003eProduct Overview \u0026amp; Core Architecture\u003c\/h3\u003e\n\u003cp\u003eManufacturer: \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eAllen-Bradley \/ Rockwell Automation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eModel: \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003e1756-OA8D\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eSeries: \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eControlLogix\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eProduct Type: \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eDiagnostic Digital AC Output Module\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eCondition: Factory New \u0026amp; Original Factory Packaging\u003c\/p\u003e\n\u003cp\u003eFulfillment: 24-48 Hour Global Express Dispatch via FedEx, UPS, and DHL\u003c\/p\u003e\n\u003cp\u003eWarranty: Comprehensive 12-Month Factory Warranty\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGlobal PLC Spare HUB's Insight:\u003c\/strong\u003e Industrial automation systems operating heavy solenoids, motor starters, and pilot lights require advanced fault detection to prevent unexpected downtime. The \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003e1756-OA8D\u003c\/strong\u003e\u003c\/span\u003e module integrates electronic fusing and point-level diagnostics directly into the ControlLogix chassis, instantly flagging blown fuses, open loads, and power loss conditions before they compromise plant safety.\u003c\/p\u003e\n\u003ch3\u003eAdvanced Technical Specifications Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOutput Channels: 8 electronically fused AC diagnostic output points grouped together\u003c\/li\u003e\n\u003cli\u003eOperating Voltage Range: 74 to 132 Volts AC at 47-63 Hz nominal 120V AC systems\u003c\/li\u003e\n\u003cli\u003ePoint Current Rating: Maximum 1.0 Amp at 30°C, de-rating linearly up to 0.5 Amps at 60°C\u003c\/li\u003e\n\u003cli\u003eModule Current Rating: Maximum 8.0 Amps total at 30°C, de-rating to 4.0 Amps at 60°C\u003c\/li\u003e\n\u003cli\u003eSurge Current Handling: 8.0 Amps for 43 ms per point recurring every 2 seconds at 30°C\u003c\/li\u003e\n\u003cli\u003eMinimum Load Requirement: 10 mA per output point to ensure reliable state detection\u003c\/li\u003e\n\u003cli\u003eBackplane Current Draw: 175 mA at 5.1 V DC and 250 mA at 24 V DC\u003c\/li\u003e\n\u003cli\u003ePower \u0026amp; Thermal Dissipation: Maximum 5.3 Watts operating draw emitting 18.0 BTU per hour\u003c\/li\u003e\n\u003cli\u003eCompatible Terminal Blocks: Requires 1756-TBNH or 1756-TBSH Removable Terminal Blocks (RTB)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEngineering Selection and Operational Guidance\u003c\/h3\u003e\n\u003cp\u003eWhen engineering high-availability AC control circuits, verify that the total connected load current does not exceed thermal de-rating limits at elevated enclosure temperatures. The \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003e1756-OA8D\u003c\/strong\u003e\u003c\/span\u003e requires a single chassis slot and utilizes configurable electronic fusing thresholds to safeguard field wiring against sustained short-circuit conditions.\u003c\/p\u003e\n\u003ch3\u003eIndustrial Application Scenarios \u0026amp; Diagnostic Capabilities\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTarget Machinery: Automated packaging assembly lines, heavy-duty conveyor sorting systems, water treatment valve manifolds, and stamping press auxiliary controls.\u003c\/li\u003e\n\u003cli\u003eDiagnostic Function: Real-time electronic monitoring of individual output point health, load status, and blown fuse states.\u003c\/li\u003e\n\u003cli\u003eFailure Detection: Immediate identification of open actuator coils, short-circuited wiring, missing field-side power, and tripped internal electronic fuses.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What triggers the diagnostic fault bit on individual channels of the 1756-OA8D?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: A diagnostic fault is reported if an open-load condition occurs in the OFF state, a short-circuit triggers the electronic fuse, or the field-side AC power source drops below operating thresholds.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do electronic fuses on this diagnostic module reset after a fault trip?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Once the underlying short-circuit or overload condition is corrected in the field wiring, the electronic fuse can be cleared via software command in Studio 5000 without physically replacing hardware fuses.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why is maintaining a minimum load current of 10 mA important for this module?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Operating below the 10 mA threshold can prevent proper state verification during open-load diagnostic checks, potentially causing false fault indications in high-impedance relay circuits.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What precautions should be taken regarding thermal de-rating inside sealed control cabinets?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Because module current de-rates from 8A at 30°C down to 4A at 60°C, cabinet designers must ensure adequate internal air circulation or forced-air cooling to prevent premature thermal tripping.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can the Removable Terminal Block (RTB) be swapped without disturbing field wiring?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Yes, compatible 1756-TBNH and 1756-TBSH terminal blocks allow technicians to disconnect wiring blocks entirely from the front of the module during maintenance without rewiring individual points.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":45013982904502,"sku":"1756-OA8D","price":165.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/1756-OA8D.jpg?v=1786347173","url":"https:\/\/www.plcsparehub.com\/products\/1756-oa8d-allen-bradley-controllogix-8-point-diagnostic-ac-output-module","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}