{"product_id":"allen-bradley-1791-24b8-block-i-o-module","title":"Allen-Bradley 1791-24B8 Block I\/O Module","description":"\u003ch2\u003e\u003cstrong\u003eAllen-Bradley 1791-24B8 Block I\/O Module: Compact DC I\/O Solution\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cstrong\u003eCore Technical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand \u0026amp; Manufacturer:\u003c\/strong\u003e Allen-Bradley\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Number:\u003c\/strong\u003e \u003cstrong\u003e1791-24B8\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Line:\u003c\/strong\u003e 1791 Block I\/O\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI\/O Configuration:\u003c\/strong\u003e 24 DC Inputs \u0026amp; 8 DC Sinking Outputs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput\/Output Voltage Range:\u003c\/strong\u003e 10 to 30 Volts DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal Voltage:\u003c\/strong\u003e 24 Volts DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal Power Supply:\u003c\/strong\u003e 19.2 to 30 Volts DC, 300 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModule Dimensions:\u003c\/strong\u003e 6.95\" x 2.7\" x 3.85\" (176.5 x 68.8 x 98 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e Approx. 2.25 lbs (1.02 kg)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eDetailed Input \u0026amp; Output Performance\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Groups:\u003c\/strong\u003e 24 inputs arranged in 3 groups of 8.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Current:\u003c\/strong\u003e 11 mA maximum at 30V DC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Response Time:\u003c\/strong\u003e Selectable \u003cspan style=\"color: #e74c3c;\"\u003eFast (1ms ON\/5ms OFF)\u003c\/span\u003e or Slow (1ms ON\/18ms OFF).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Current Rating:\u003c\/strong\u003e Up to 0.5A per point (1.0A at reduced ambient temperature).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Impact:\u003c\/strong\u003e Output current de-rates with horizontal mounting orientation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurge Current:\u003c\/strong\u003e Outputs can handle 3A surge for 50ms, recurring every 2 seconds.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eEnvironmental \u0026amp; Power Ratings\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e 0°C to 60°C (32°F to 140°F).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelative Humidity:\u003c\/strong\u003e 5% to 95%, non-condensing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Dissipation:\u003c\/strong\u003e Maximum 17.1 Watts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Dissipation:\u003c\/strong\u003e Maximum 58.1 BTU\/hour.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal Protection:\u003c\/strong\u003e The external power supply includes internal protection circuitry.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ - Frequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is the main advantage of the \u003cstrong\u003e1791-24B8\u003c\/strong\u003e?\u003c\/strong\u003e Its compact design provides 32 DC I\/O points with a wide 10-30VDC operating range for flexibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhy does mounting orientation affect the output current?\u003c\/strong\u003e Thermal dissipation differs; vertical mounting allows better heat dissipation for higher continuous current.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCan I use this module with 12V DC sensors?\u003c\/strong\u003e Yes, the input range of 10-30V DC fully supports common 12V and 24V DC sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat does \"sinking output\" mean?\u003c\/strong\u003e The output acts as a switch to ground (0V). The load connects between the output point and the positive DC supply voltage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e© 2025 Ubest Automation Limited. \u003ca href=\"https:\/\/www.ubestplc.com\/\"\u003ehttps:\/\/www.ubestplc.com\/\u003c\/a\u003e All rights reserved.\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eContact:\u003c\/strong\u003e Email: \u003ca href=\"mailto:sales@ubestplc.com\"\u003esales@ubestplc.com\u003c\/a\u003e Phone: \u003ca href=\"https:\/\/wa.me\/8618030005825\"\u003e+86 180 3000 5825\u003c\/a\u003e\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":51506179932442,"sku":"1791-24B8","price":235.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0873\/6240\/4634\/files\/1791-24B8-1.jpg?v=1767059755","url":"https:\/\/www.ubestplc.com\/products\/allen-bradley-1791-24b8-block-i-o-module","provider":"Ubest Automation Limited","version":"1.0","type":"link"}