{"product_id":"allen-bradley-1746-ob8-plc-module","title":"Allen-Bradley 1746-OB8 SLC 500 Digital DC Output Module","description":"\u003cp\u003eThe Allen-Bradley 1746-OB8 is a high-performance digital DC output module designed for use within the SLC 500 programmable controller platform. This module provides eight sourcing output channels, engineered to drive 10V to 50V DC loads, including solenoids, relays, and various industrial actuators. By switching the positive potential of the DC supply, this sourcing module maintains compatibility with standard industrial control architectures requiring positive-side switching.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEight (8) sourcing output channels grouped for streamlined wiring.\u003c\/li\u003e\n\u003cli\u003eWide operating voltage range from 10V to 50V DC.\u003c\/li\u003e\n\u003cli\u003eOptical isolation rated at 1500V AC to protect the backplane and processor from transient electrical noise.\u003c\/li\u003e\n\u003cli\u003eRobust current handling with thermal derating support for high-temperature environments.\u003c\/li\u003e\n\u003cli\u003eIntegrated status indicators for clear visual monitoring of individual output states.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplications\u003c\/h3\u003e\u003cp\u003eThis module is widely utilized in discrete manufacturing and process control environments where reliable DC load switching is required. It is ideal for interfacing with 24V DC control devices, such as pilot lights, contactors, and small DC motors, within an SLC 500 rack-based system.\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\u003eSeries\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)\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 (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 (resistive load)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent per Point\u003c\/td\u003e\n\u003ctd\u003e1.0A (30 degC) \/ 0.5A (60 degC)\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 SLC 500 power supply is disconnected before inserting or removing the module from the chassis.\u003c\/li\u003e\n\u003cli\u003eMount the module in an appropriate SLC 500 chassis slot, ensuring the backplane connector is fully seated and the module is secured with the top and bottom retaining screws.\u003c\/li\u003e\n\u003cli\u003eMaintain proper ventilation within the control cabinet; note that current capacity is subject to thermal derating at temperatures above 30 degC.\u003c\/li\u003e\n\u003cli\u003eUse shielded cabling for I\/O connections to minimize the impact of electromagnetic interference (EMI) in high-noise environments.\u003c\/li\u003e\n\u003cli\u003eVerify that the external power supply for the DC loads is within the specified 10-50V DC range to prevent damage to the output transistors.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch3\u003eWhat is the primary function of the 1746-OB8 module?\u003c\/h3\u003e\u003cp\u003eThe 1746-OB8 is a digital output module that provides eight sourcing DC outputs, allowing the SLC 500 PLC to control external 10V to 50V DC devices.\u003c\/p\u003e\u003ch3\u003eDoes this module require external power?\u003c\/h3\u003e\u003cp\u003eYes, the module requires an external DC power source to drive the connected loads, as it performs high-side switching of the provided DC voltage.\u003c\/p\u003e\u003ch3\u003eHow does temperature affect the output current?\u003c\/h3\u003e\u003cp\u003eThe module's current capacity is temperature-dependent. At 30 degC, it supports up to 1.0A per point, but this must be reduced to 0.5A per point when operating at the maximum ambient temperature of 60 degC.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":44694267232344,"sku":"1746-OB8","price":96.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/2039\/0488\/files\/wm_1_d55abcfc-2b5a-406f-a1aa-39d9325d352e.jpg?v=1788298018","url":"https:\/\/www.industriaxplc.com\/id\/products\/allen-bradley-1746-ob8-plc-module","provider":"IndustriaX Limited","version":"1.0","type":"link"}