{"product_id":"allen-bradley-1756-ob8-controllogix-digital-dc-output-module","title":"Allen-Bradley 1756-OB8 ControlLogix Digital DC Output Module","description":"\u003ch2\u003eAllen-Bradley 1756-OB8 ControlLogix Digital DC Output Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1756-OB8\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1756-OB8\u003c\/strong\u003e Digital DC Output Module, operates as a dedicated hardware component for DC sourcing signal execution within ControlLogix I\/O platforms. The module provides eight 24 VDC output channels with grouped channel architecture, field-side isolation, and backplane communication through compatible ControlLogix chassis.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1756-OB8\u003c\/td\u003e\n\u003c\/tr\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\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.70 lbs \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e2.5 W maximum at 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eDigital DC Output Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Line\u003c\/td\u003e\n\u003ctd\u003eControlLogix\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Outputs\u003c\/td\u003e\n\u003ctd\u003e8 points\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eDC Sourcing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VDC nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage Range\u003c\/td\u003e\n\u003ctd\u003e10-30 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Groups\u003c\/td\u003e\n\u003ctd\u003e2 groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannels per Group\u003c\/td\u003e\n\u003ctd\u003e4 channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Output Current per Point\u003c\/td\u003e\n\u003ctd\u003e2 A at 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Output Current per Module\u003c\/td\u003e\n\u003ctd\u003e8 A at 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Delay ON Transition\u003c\/td\u003e\n\u003ctd\u003e1 ms maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Delay OFF Transition\u003c\/td\u003e\n\u003ctd\u003e2 ms maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current at 5.1 VDC\u003c\/td\u003e\n\u003ctd\u003e165 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current at 24 VDC\u003c\/td\u003e\n\u003ctd\u003e2 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Backplane Power\u003c\/td\u003e\n\u003ctd\u003e0.89 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e50 V continuous\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRemovable Terminal Blocks\u003c\/td\u003e\n\u003ctd\u003e1756-TBNH, 1756-TBSH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eControlLogix Backplane Communication and I\/O Scaling\u003c\/h3\u003e\n\u003cp\u003eThe 1756-OB8 operates within the ControlLogix I\/O architecture using backplane bus communication for controller data exchange and output command execution. The module supports I\/O density scaling through multi-slot chassis configurations while maintaining individual channel addressing and field output control.\u003c\/p\u003e\n\u003cp\u003eFirmware flash compatibility follows the ControlLogix module lifecycle structure, allowing controller-based configuration and module maintenance. The output interface provides grouped channel organization for DC field devices requiring 12\/24 VDC source switching.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How many output channels are available on the 1756-OB8 module?\u003cbr\u003eA: The module provides eight DC sourcing output channels arranged in two groups of four channels.\u003c\/p\u003e\n\u003cp\u003eQ: What is the maximum current capacity of the output channels?\u003cbr\u003eA: Each output point supports up to 2 A at 60 deg C, with a maximum module current rating of 8 A at 60 deg C.\u003c\/p\u003e\n\u003cp\u003eQ: Which removable terminal blocks are compatible with the 1756-OB8?\u003cbr\u003eA: The module supports 1756-TBNH and 1756-TBSH removable terminal blocks.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1756-OB8 module into a compatible ControlLogix chassis slot and confirm correct seating of the module connector before applying field power. Verify that connected DC loads operate within the specified 10-30 VDC output range and current limitations.\u003c\/p\u003e\n\u003cp\u003eSeparate DC output wiring from high-voltage and high-frequency switching conductors to reduce electrical interference. Apply field cable shielding and grounding practices according to the site electrical standard. Confirm removable terminal block installation, wiring polarity, and output configuration before commissioning connected devices.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43623414300762,"sku":"1756-OB8","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1756-OB82.jpg?v=1783567971","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1756-ob8-controllogix-digital-dc-output-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}