{"product_id":"allen-bradley-1791-8br-block-i-o-module","title":"Allen-Bradley 1791-8BR Block I\/O Module","description":"\u003ch2\u003e\u003cstrong\u003eProduct Overview: Allen-Bradley 1791-8BR Block I\/O Module\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Technical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e \u003cspan style=\"color: #e74c3c;\"\u003eAllen-Bradley\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e \u003cstrong\u003e\u003cspan style=\"color: #e74c3c;\"\u003e1791-8BR\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e 1791 Block I\/O\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModule Type:\u003c\/strong\u003e Combination Input \/ Relay Output Module\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Channels:\u003c\/strong\u003e 8 Points, 24VDC Sinking\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Channels:\u003c\/strong\u003e 8 Points, Dry Contact (Form A) Relay\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Voltage Range:\u003c\/strong\u003e 10-30 VDC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelay Contact Rating:\u003c\/strong\u003e 1A Resistive Max. (20-30VDC \/ 20-132VAC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModule Power Supply:\u003c\/strong\u003e 19.2–30 VDC External\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommunication Protocol:\u003c\/strong\u003e Remote I\/O (RIO)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.00 lb (0.45 kg)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eInput \u0026amp; Output Characteristics\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe eight DC inputs require an \u003cstrong\u003e\u003cspan style=\"color: #27ae60;\"\u003eon-state voltage between 10-30 VDC\u003c\/span\u003e\u003c\/strong\u003e to activate.\u003c\/li\u003e\n\u003cli\u003eEach input draws a maximum of \u003cstrong\u003e\u003cspan style=\"color: #27ae60;\"\u003e11 mA at 30V\u003c\/span\u003e\u003c\/strong\u003e when on.\u003c\/li\u003e\n\u003cli\u003eThe output channels feature \u003cstrong\u003e\u003cspan style=\"color: #2980b9;\"\u003eNormally Open (N.O.) dry contacts\u003c\/span\u003e\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eRelay outputs are highly flexible, switching both AC and DC loads.\u003c\/li\u003e\n\u003cli\u003eThe maximum resistive load rating is \u003cstrong\u003e\u003cspan style=\"color: #27ae60;\"\u003e1A at 20-30 VDC or 20-132 VAC\u003c\/span\u003e\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eAlways use \u003cstrong\u003e\u003cspan style=\"color: #c0392b;\"\u003eexternal fusing\u003c\/span\u003e\u003c\/strong\u003e for output circuits, as the module lacks internal load protection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation \u0026amp; Wiring\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMount the module vertically or horizontally on a standard DIN rail.\u003c\/li\u003e\n\u003cli\u003eConnect the \u003cstrong\u003e\u003cspan style=\"color: #2980b9;\"\u003e24VDC external power\u003c\/span\u003e\u003c\/strong\u003e to terminals +24 (1) and RET +24 (3).\u003c\/li\u003e\n\u003cli\u003eTerminal GND (2) is for chassis ground connection.\u003c\/li\u003e\n\u003cli\u003eUse terminals BLU (6), SHD (7), and CLR (8) for the RIO network communication cable.\u003c\/li\u003e\n\u003cli\u003eFor signal wiring, use a maximum of \u003cstrong\u003e\u003cspan style=\"color: #27ae60;\"\u003e14 AWG stranded wire\u003c\/span\u003e\u003c\/strong\u003e.\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions (FAQ)\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Is the 1791-8BR a relay output module?\u003c\/strong\u003e\u003cbr\u003eA: Yes. It has \u003cstrong\u003e\u003cspan style=\"color: #27ae60;\"\u003e8 dry contact relay outputs\u003c\/span\u003e\u003c\/strong\u003e that can switch both AC and DC voltages.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: What controllers is this module compatible with?\u003c\/strong\u003e\u003cbr\u003eA: It is compatible with Allen-Bradley PLC-2, PLC-3, PLC-5, and SLC 500 controllers via RIO.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Does the module include internal fuses for protection?\u003c\/strong\u003e\u003cbr\u003eA: No. You \u003cstrong\u003e\u003cspan style=\"color: #c0392b;\"\u003emust install external fuses\u003c\/span\u003e\u003c\/strong\u003e to protect the output circuits and connected loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: What is the switching capacity of the relay contacts?\u003c\/strong\u003e\u003cbr\u003eA: The relay contacts are rated for a maximum of \u003cstrong\u003e\u003cspan style=\"color: #27ae60;\"\u003e1 Amp resistive load\u003c\/span\u003e\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Do you have the 1791-8BR in stock?\u003c\/strong\u003e\u003cbr\u003eA: Yes, we maintain stock for quick shipment, typically within 5 business days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: What is your return policy?\u003c\/strong\u003e\u003cbr\u003eA: We offer a straightforward \u003cstrong\u003e\u003cspan style=\"color: #27ae60;\"\u003e30-day return policy\u003c\/span\u003e\u003c\/strong\u003e for all products.\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 | Phone: \u003ca href=\"https:\/\/wa.me\/8615392429628\"\u003e+86 153 9242 9628\u003c\/a\u003e\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":47289561415938,"sku":"1791-8BR","price":216.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7280\/6146\/files\/1791-8BR.jpg?v=1773892549","url":"https:\/\/www.nex-auto.com\/pl\/products\/allen-bradley-1791-8br-block-i-o-module","provider":"NexAuto Technology Limited","version":"1.0","type":"link"}