{"product_id":"allen-bradley-1791-iobb-block-i-o-module","title":"Allen-Bradley 1791-IOBB Block I\/O Module","description":"\u003ch2\u003eAllen-Bradley 1791-IOBB Block I\/O Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1791-IOBB\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1791-IOBB\u003c\/strong\u003e Block I\/O Module, operates as a dedicated hardware component for discrete signal acquisition and output switching within PLC-2, PLC-3, and PLC-5 control platforms. The module provides 10 sinking inputs and 6 sourcing outputs with a 10-30 VDC I\/O supply range.\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\u003e1791-IOBB\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\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.64 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e12.39 W maximum, 8.73 W typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Line\u003c\/td\u003e\n\u003ctd\u003e1791 Block I\/O\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003e16 Point I\/O Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003e10 sinking inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Channels\u003c\/td\u003e\n\u003ctd\u003e6 sourcing outputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e20.5-27.6 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated Output Voltage\u003c\/td\u003e\n\u003ctd\u003e10-30 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eSource\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Current Rating\u003c\/td\u003e\n\u003ctd\u003e200 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermal Dissipation\u003c\/td\u003e\n\u003ctd\u003e42.4 BTU\/hr maximum, 29.8 BTU\/hr typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to 85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelative Humidity\u003c\/td\u003e\n\u003ctd\u003e5% to 95% non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eIndustrial Control Bus and I\/O Architecture\u003c\/h3\u003e\n\u003cp\u003eThe 1791-IOBB is designed for Allen-Bradley Block I\/O applications and supports discrete signal exchange between field devices and PLC control systems. The module provides I\/O density scaling by integrating multiple digital input and output points in a compact block configuration.\u003c\/p\u003e\n\u003cp\u003eThe module operates with PLC-2, PLC-3, and PLC-5 system architectures. Firmware flash compatibility and controller configuration parameters must be verified when integrating the module into existing control platforms.\u003c\/p\u003e\n\u003cp\u003eThe I\/O structure consists of current sinking input channels and current sourcing output channels. The source output design provides DC switching capability for connected field loads within the specified voltage range.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How many input and output points are available on the 1791-IOBB module?\u003cbr\u003eA: The module provides 10 sinking input points and 6 sourcing output points, for a total of 16 discrete I\/O points.\u003c\/p\u003e\n\u003cp\u003eQ: What type of output circuit is used by the 1791-IOBB?\u003cbr\u003eA: The module uses sourcing output circuits with a rated output voltage range of 10-30 VDC.\u003c\/p\u003e\n\u003cp\u003eQ: Is the 1791-IOBB compatible with modern Ethernet-based networks?\u003cbr\u003eA: The available technical data identifies compatibility with PLC-2, PLC-3, and PLC-5 platforms. Ethernet-based compatibility is not specified.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1791-IOBB according to the mechanical requirements of the control enclosure and verify that mounting conditions support proper module retention. Confirm supply voltage polarity and terminal assignments before applying power.\u003c\/p\u003e\n\u003cp\u003eRoute discrete I\/O wiring separately from high-voltage conductors and sources of electrical noise. Use appropriate grounding and shielding practices according to the overall control system installation requirements.\u003c\/p\u003e\n\u003cp\u003eBefore operation, verify each input channel state change and confirm that output channels switch correctly under the connected field load conditions. Check controller configuration parameters and I\/O addressing before placing the module into service.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43763048972378,"sku":"1791-IOBB","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1791-IOBB2.jpg?v=1785397428","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1791-iobb-block-i-o-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}