{"product_id":"allen-bradley-1791-24a8-block-i-o-module-24-ac-inputs","title":"Allen-Bradley 1791-24A8 Block I\/O Module - 24 AC Inputs","description":"\u003ch2\u003e\u003cstrong\u003eAllen-Bradley 1791-24A8: 32-Point AC Block I\/O Module\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e \u003cspan style=\"color: #2e86c1;\"\u003eAllen-Bradley\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e \u003cstrong\u003e1791-24A8\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e AC Block I\/O Module\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Channels:\u003c\/strong\u003e 24 AC inputs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Channels:\u003c\/strong\u003e 8 AC outputs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Voltage:\u003c\/strong\u003e 79-132V AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Voltage:\u003c\/strong\u003e 20-132V AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal Power:\u003c\/strong\u003e 85-132V AC, 150 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput On-State Current:\u003c\/strong\u003e 12.3mA @ 132V max\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Off-State Voltage:\u003c\/strong\u003e 35V AC max\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Dissipation:\u003c\/strong\u003e 18.76 Watts maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.88 lbs (0.85 kg)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Vertical or Horizontal\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation \u0026amp; Wiring Guidelines\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInstall the module in either \u003cspan style=\"color: #2e86c1;\"\u003evertical or horizontal orientation\u003c\/span\u003e within your control panel.\u003c\/li\u003e\n\u003cli\u003eUse \u003cspan style=\"color: #2e86c1;\"\u003eBelden 9463 cable\u003c\/span\u003e (Blue Hose wire) for Remote I\/O network connections.\u003c\/li\u003e\n\u003cli\u003eThis three-wire cable includes blue, clear, and shielded conductors for reliable communication.\u003c\/li\u003e\n\u003cli\u003eConnect modules in a \u003cspan style=\"color: #2e86c1;\"\u003edaisy-chain topology\u003c\/span\u003e to create your Remote I\/O network.\u003c\/li\u003e\n\u003cli\u003eInstall a \u003cspan style=\"color: #2e86c1;\"\u003eterminating resistor\u003c\/span\u003e (82Ω or 150Ω) at the last node of the network.\u003c\/li\u003e\n\u003cli\u003eThe terminating resistor closes the communication loop and prevents intermittent connections.\u003c\/li\u003e\n\u003cli\u003eEnsure all connections are secure and follow local electrical codes for 120V AC installations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCommunication \u0026amp; Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe \u003cstrong\u003e1791-24A8\u003c\/strong\u003e operates in \u003cspan style=\"color: #2e86c1;\"\u003eRemote I\/O adapter mode\u003c\/span\u003e, requiring an RIO scanner.\u003c\/li\u003e\n\u003cli\u003eIt connects directly to \u003cspan style=\"color: #2e86c1;\"\u003ePLC-2, PLC-3, and PLC-5\u003c\/span\u003e controller families via built-in RIO interface.\u003c\/li\u003e\n\u003cli\u003eFor SLC 500 controllers, use with the \u003cspan style=\"color: #2e86c1;\"\u003e1747-SN Remote I\/O scanner module\u003c\/span\u003e.\u003c\/li\u003e\n\u003cli\u003eSupports standard baud rates: \u003cspan style=\"color: #2e86c1;\"\u003e57.6K, 115.2K, and 230.4K\u003c\/span\u003e.\u003c\/li\u003e\n\u003cli\u003eMaximum cable distances: \u003cspan style=\"color: #2e86c1;\"\u003e10,000 ft at 57.6K\u003c\/span\u003e, 5,000 ft at 115.2K, 2,500 ft at 230.4K.\u003c\/li\u003e\n\u003cli\u003eThe module organizes inputs into \u003cspan style=\"color: #2e86c1;\"\u003e3 groups of 8\u003c\/span\u003e and outputs as \u003cspan style=\"color: #2e86c1;\"\u003e1 group of 8\u003c\/span\u003e.\u003c\/li\u003e\n\u003cli\u003eThis grouping simplifies addressing and configuration in your PLC program.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is the voltage rating for the 1791-24A8 inputs and outputs?\u003c\/strong\u003e\u003cbr\u003eThe \u003cstrong\u003e1791-24A8\u003c\/strong\u003e supports \u003cspan style=\"color: #2e86c1;\"\u003e120V AC operation\u003c\/span\u003e with inputs rated 79-132V AC and outputs 20-132V AC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhich Allen-Bradley PLCs work with this module?\u003c\/strong\u003e\u003cbr\u003eThis module is compatible with \u003cspan style=\"color: #2e86c1;\"\u003ePLC-2, PLC-3, PLC-5, and SLC 500\u003c\/span\u003e controllers (using 1747-SN scanner).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat cable should I use for Remote I\/O connections?\u003c\/strong\u003e\u003cbr\u003eAllen-Bradley recommends \u003cspan style=\"color: #2e86c1;\"\u003eBelden 9463 cable\u003c\/span\u003e, commonly called \"Blue Hose\" wire, for optimal performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhy do I need a terminating resistor?\u003c\/strong\u003e\u003cbr\u003eA terminating resistor \u003cspan style=\"color: #2e86c1;\"\u003e(82Ω or 150Ω)\u003c\/span\u003e at the last network node ensures stable communication and prevents signal issues.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDo you have stock and what is your shipping time?\u003c\/strong\u003e\u003cbr\u003eYes, we stock the \u003cstrong\u003e1791-24A8\u003c\/strong\u003e and \u003cspan style=\"color: #2e86c1;\"\u003eship within 3-5 business days\u003c\/span\u003e via DHL, FedEx, or UPS.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is your return policy?\u003c\/strong\u003e\u003cbr\u003eWe offer a \u003cspan style=\"color: #2e86c1;\"\u003e30-day return window\u003c\/span\u003e for all products in original condition.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e© 2026 NexAuto Technology Limited. All rights reserved.\u003cbr\u003eOriginal Source: \u003ca href=\"https:\/\/www.nex-auto.com\/\"\u003ehttps:\/\/www.nex-auto.com\/\u003c\/a\u003e\u003cbr\u003eContact: \u003ca href=\"mailto:sales@nex-auto.com\"\u003esales@nex-auto.com\u003c\/a\u003e\u003cbr\u003ePhone: \u003ca href=\"https:\/\/wa.me\/8615392429628\" target=\"_blank\"\u003e+86 153 9242 9628\u003c\/a\u003e\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":47285600059650,"sku":"1791-24A8","price":218.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7280\/6146\/files\/1791-24A8.jpg?v=1770796398","url":"https:\/\/www.nex-auto.com\/bg\/products\/allen-bradley-1791-24a8-block-i-o-module-24-ac-inputs","provider":"NexAuto Technology Limited","version":"1.0","type":"link"}