{"product_id":"1756-ob8-allen-bradley-controllogix-digital-dc-output-module","title":"1756-OB8 | Allen Bradley | ControlLogix Digital DC Output Module","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen Bradley 1756-OB8\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eprovides high-current discrete control within the ControlLogix ecosystem. This module features eight independent sourcing outputs, delivering 24V DC power directly to field devices. As a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New and Original\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eunit, it serves as a robust interface for driving heavy-duty DC loads such as large solenoids, motor starters, and hydraulic valves. Its high amperage rating makes it the primary choice for applications requiring more power than standard high-density I\/O modules can provide.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cp\u003eThe 1756-OB8 utilizes a sourcing architecture to switch power to the load with the following performance ratings:\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\u003eOutput Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eDigital DC Sourcing (Current Source)\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\u003e8 Channels\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eVoltage Category\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e12\/24V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Voltage Range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e10–31.2V 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\u003e2 Amps per point (Max)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModule Total Current\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e8 Amps per module (Max)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackplane Current (5.1V)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e165 mA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackplane Current (24V)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 mA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.70 lbs (0.32 kg)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSlot Width\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1 (Single Slot)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eEngineering Advantages\u003c\/h2\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Current Drive Capability:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eEach of the 8 channels supports up to 2 Amps. This eliminates the need for interposing relays when controlling larger DC actuators, reducing the total component count in the control cabinet.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSourcing Output Safety:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe sourcing (current sourcing) design switches the positive side of the DC circuit. This configuration prevents accidental machine starts if a wire shorts to the ground, aligning with international safety standards for industrial machinery.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDeterministic Logic Execution:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIntegrated electronic fusing and high-speed switching circuits ensure the module responds to processor commands with minimal latency, maintaining tight synchronization for motion and process control loops.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSimplified Maintenance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module utilizes a Removable Terminal Block (RTB), allowing technicians to replace the hardware without disconnecting individual field wires, which significantly minimizes system downtime.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFAQs\u003c\/h2\u003e\n\u003cul class=\"list-paddingleft-2\"\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\u003eYes. You must use a 1756-TBNH or 1756-TBSH (spring clamp) terminal block. The RTB does not ship with the module and requires a separate order to complete the installation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan I parallel the outputs to achieve a higher current rating?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe hardware does not support paralleling outputs to increase current capacity for a single load. Each point operates independently with its own 2A current limit to protect the internal circuitry.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the 1756-OB8 handle short circuits in the field?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module features electronic protection that detects over-current conditions. It shuts down the affected channel to prevent hardware damage, while providing diagnostic feedback to the ControlLogix processor.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIs this a factory-sealed, new-in-box unit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAbsolutely. We guarantee this 1756-OB8 is\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eoriginal stock. It arrives in factory-sealed Allen Bradley packaging with original security labels intact.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52476007121205,"sku":"1756-OB8","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/1756-OB32_6f58aec4-469d-4b73-9c11-42eb584a7e9f.jpg?v=1774406909","url":"https:\/\/www.5gplc.com\/products\/1756-ob8-allen-bradley-controllogix-digital-dc-output-module","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}