{"product_id":"allen-bradley-1746-ob8-plc-module","title":"Allen-Bradley 1746-OB8 SLC 500 Digital DC Output Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\u003cp\u003eThe Allen-Bradley 1746-OB8 is a high-performance discrete DC output module designed for the SLC 500 programmable logic controller series. This module features eight (8) sourcing outputs, engineered to drive 24V DC to 48V DC loads, including relays, solenoids, and small actuators. As a sourcing module, it switches the positive side of the DC power source to the load, ensuring compatibility with standard industrial control architectures.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEight (8) sourcing outputs in a single group.\u003c\/li\u003e\n\u003cli\u003eWide operating voltage range of 10V to 50V DC.\u003c\/li\u003e\n\u003cli\u003eElectro-optical isolation rated at 1500V between I\/O terminals and internal control logic.\u003c\/li\u003e\n\u003cli\u003eIntegrated status indicators for monitoring output state.\u003c\/li\u003e\n\u003cli\u003eRobust thermal management with specified derating for operation up to 60 degC.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplications\u003c\/h3\u003e\u003cp\u003eThis module is widely utilized in industrial automation environments for controlling actuators, contactors, and pilot lights within the SLC 500 platform. Its sourcing configuration is ideal for applications requiring positive-side switching in automated manufacturing, material handling, and process control systems.\u003c\/p\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable border=\"1\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Line\u003c\/td\u003e\n\u003ctd\u003eSLC 500\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eDigital DC Output (Sourcing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Outputs\u003c\/td\u003e\n\u003ctd\u003e8 (1 Group of 8)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Range\u003c\/td\u003e\n\u003ctd\u003e10–50V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current (5V DC)\u003c\/td\u003e\n\u003ctd\u003e135 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOn-Signal Delay\u003c\/td\u003e\n\u003ctd\u003e0.1 ms (max resistive load)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOff-Signal Delay\u003c\/td\u003e\n\u003ctd\u003e1.0 ms (max resistive load)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous Current per Point\u003c\/td\u003e\n\u003ctd\u003e1.0 A @ 30 degC \/ 0.5 A @ 60 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous Current per Module\u003c\/td\u003e\n\u003ctd\u003e8.0 A @ 30 degC \/ 4.0 A @ 60 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Surge Current\u003c\/td\u003e\n\u003ctd\u003e3.0 Amps for 10 ms (per point)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Off-State Leakage\u003c\/td\u003e\n\u003ctd\u003e1.0 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Heat Dissipation\u003c\/td\u003e\n\u003ctd\u003e6.9 Watts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEnsure the PLC chassis power is disconnected before inserting or removing the module.\u003c\/li\u003e\n\u003cli\u003eVerify that the module is fully seated in the SLC 500 chassis slot and secured with the top and bottom mounting screws.\u003c\/li\u003e\n\u003cli\u003eUse shielded cabling for I\/O connections to minimize electromagnetic interference (EMI) in high-noise environments.\u003c\/li\u003e\n\u003cli\u003eEnsure proper thermal clearance around the module to maintain the specified operating temperature range.\u003c\/li\u003e\n\u003cli\u003eFollow local electrical codes for grounding and wire routing to prevent ground loops and signal degradation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch3\u003eWhat is the difference between sourcing and sinking outputs?\u003c\/h3\u003e\u003cp\u003eA sourcing module (like the 1746-OB8) switches the positive voltage (VDC+) to the load, while the load is connected to the common return. A sinking module switches the common return (VDC-) to the load.\u003c\/p\u003e\u003ch3\u003eCan this module be used at 60 degC?\u003c\/h3\u003e\u003cp\u003eYes, the module is rated for operation up to 60 degC, but you must adhere to the thermal derating specifications, which limit the continuous current per point to 0.5 Amps at this temperature.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":50738300584188,"sku":"1746-OB8","price":96.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/wm_1_e9fed56e-ea3a-4013-ae6e-f4e37f2b33ef.jpg?v=1785371653","url":"https:\/\/www.electronicplc.com\/es\/products\/allen-bradley-1746-ob8-plc-module","provider":"Electronic PLC","version":"1.0","type":"link"}