{"product_id":"1756-ob8ei-industrial-automation-module-by-allen-bradley","title":"1756-OB8EI Industrial Automation Module by Allen-Bradley","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThe Allen-Bradley 1756-OB8EI is a ControlLogix discrete output module engineered for demanding industrial control environments. It provides eight (8) electronically fused, individually isolated sourcing output channels, delivering a nominal 24V DC output with an operating range of 10-30V DC. This module is designed to energize loads such as relay coils, pilot lamps, buzzers, horns, sirens, and valves, making it a versatile component in automation systems.\u003c\/p\u003e\u003cp\u003eWith its robust construction and precise current control, the 1756-OB8EI ensures reliable switching performance while protecting downstream equipment from overcurrent conditions. Its compact single-slot design fits directly into any 1756 ControlLogix chassis, supporting both local and distributed I\/O configurations.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cp\u003eThe following table outlines the key technical parameters of the Allen-Bradley 1756-OB8EI module:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eRockwell Automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eControlLogix\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e1756-OB8EI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eDigital DC Sourcing Output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Outputs\u003c\/td\u003e\n\u003ctd\u003e8 (Electronically fused, individually isolated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Voltage\u003c\/td\u003e\n\u003ctd\u003e24V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e10-30V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Current per Channel\u003c\/td\u003e\n\u003ctd\u003e2 A @ 60 °C (140 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Current per Module (Max)\u003c\/td\u003e\n\u003ctd\u003e10 A @ 60 °C (140 °F); 16 A @ 55 °C (131 °F) linear derating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current (5.1V DC)\u003c\/td\u003e\n\u003ctd\u003e250 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current (24V DC)\u003c\/td\u003e\n\u003ctd\u003e2 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Dissipation\u003c\/td\u003e\n\u003ctd\u003e4.7 W @ 60 °C (140 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Signal Delay (OFF to ON)\u003c\/td\u003e\n\u003ctd\u003e1 ms, max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Signal Delay (ON to OFF)\u003c\/td\u003e\n\u003ctd\u003e5 ms, max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure Type Rating\u003c\/td\u003e\n\u003ctd\u003eNone (open-style)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRemovable Terminal Block\u003c\/td\u003e\n\u003ctd\u003e1756-TBCH; 1756-TBS6H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eReal-World Applications\u003c\/h2\u003e\u003cp\u003eThe Allen-Bradley 1756-OB8EI excels in applications requiring high-density, fused, isolated discrete outputs. Typical use cases include:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachine Control:\u003c\/strong\u003e Energizing solenoid valves, contactors, and indicator lamps in automated assembly lines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProcess Control:\u003c\/strong\u003e Driving alarm annunciators, horns, and motor starters in continuous processing plants.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Handling:\u003c\/strong\u003e Controlling conveyor diverters, gate actuators, and sortation equipment.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eBecause each output is electronically fused and individually isolated, the 1756-OB8EI minimizes downtime by preventing a single fault from disabling multiple points—a critical advantage for high-availability systems.\u003c\/p\u003e\u003ch2\u003eInstallation \u0026amp; Setup\u003c\/h2\u003e\u003cp\u003eInstalling the 1756-OB8EI is straightforward:\u003c\/p\u003e\u003col\u003e\n\u003cli\u003ePower down the chassis and insert the module into an available slot, ensuring proper seating.\u003c\/li\u003e\n\u003cli\u003eConnect the removable terminal block (RTB) using the compatible 1756-TBCH or 1756-TBS6H.\u003c\/li\u003e\n\u003cli\u003eWire field devices to the appropriate output terminals, observing polarity and voltage ratings (10-30V DC).\u003c\/li\u003e\n\u003cli\u003eConfigure the module in the ControlLogix programming software, setting fault and program mode behavior as needed.\u003c\/li\u003e\n\u003c\/ol\u003e\u003cp\u003eNote that the module is open-style; install it in a suitable enclosure to meet environmental requirements.\u003c\/p\u003e\u003ch2\u003eMaintenance \u0026amp; Reliability\u003c\/h2\u003e\u003cp\u003eRoutine maintenance for the 1756-OB8EI is minimal. Periodically inspect wiring connections and verify that the ambient temperature stays within the 0-60 °C operating range. The module's electronic fusing eliminates the need to replace physical fuses, reducing spare parts inventory and service time.\u003c\/p\u003e\u003cp\u003eIts isolation voltage of 50V continuous and routine testing at 1350V for 2 seconds ensure robust protection against transient events, contributing to long service life.\u003c\/p\u003e\u003ch2\u003eCompatibility \u0026amp; Integration\u003c\/h2\u003e\u003cp\u003eThe 1756-OB8EI integrates seamlessly into any ControlLogix system. It occupies a single slot and supports multiple instances on local or distributed I\/O racks. The module is compatible with any POINT I\/O communication adapter for implementing distributed I\/O architectures, allowing flexible system scaling.\u003c\/p\u003e\u003ch2\u003eSelection Guide \u0026amp; Purchasing Advice\u003c\/h2\u003e\u003cp\u003eBefore purchasing, verify that your system has an available ControlLogix slot and that the backplane current capacity (250 mA @ 5.1V, 2 mA @ 24V) is within your power supply limits. Ensure you have the correct RTB (1756-TBCH or 1756-TBS6H) for wiring.\u003c\/p\u003e\u003cp\u003eWhen sourcing genuine Allen-Bradley components, trust PLC Source PRO for authentic parts and reliable service. Our inventory is sourced directly from authorized channels, ensuring quality and compatibility.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default","offer_id":44435591266403,"sku":"1756-OB8EI","price":283.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0678\/8635\/0435\/files\/1756-2WS_6d79b38d-c4b7-41c9-81e4-25805c6028d6.jpg?v=1785789326","url":"https:\/\/www.plcsourcepro.com\/products\/1756-ob8ei-industrial-automation-module-by-allen-bradley","provider":"PLC Source PRO","version":"1.0","type":"link"}