{"product_id":"1791-8br-industrial-automation-module-by-allen-bradley","title":"1791-8BR Industrial Automation Module by Allen-Bradley","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThe Allen-Bradley 1791-8BR is a compact Block I\/O module designed for distributed industrial automation. This combination module integrates eight 24VDC inputs and eight normally open relay outputs into a single rackless unit. It supports Remote I\/O (RIO) protocol, enabling seamless connection to RIO scanners and controllers. With its built-in power supply, communication interface, and signal conditioning circuitry, the 1791-8BR operates as a stand-alone I\/O station, reducing long cable runs by mounting near field devices.\u003c\/p\u003e\u003ch2\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e8 inputs \/ 8 outputs\u003c\/strong\u003e – Combines discrete input and output capability in one module.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24VDC input rating\u003c\/strong\u003e – Matches standard industrial sensor voltages.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDry contact relay outputs\u003c\/strong\u003e – Compatible with AC or DC loads, offering flexibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRIO protocol support\u003c\/strong\u003e – Interfaces directly with Allen-Bradley PLC and SLC families.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRackless design\u003c\/strong\u003e – Mounts on standard DIN rail or panel, saving cabinet space.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in diagnostics\u003c\/strong\u003e – Integrated circuitry simplifies troubleshooting.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eAllen Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCategory\u003c\/td\u003e\n\u003ctd\u003ePLCs\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\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e1791-8BR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e612598126224\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.00 lbs (0.45 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eBlock I\/O combination module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Power\u003c\/td\u003e\n\u003ctd\u003e24VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo. of Inputs\u003c\/td\u003e\n\u003ctd\u003eEight (8)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput On-state Voltage\u003c\/td\u003e\n\u003ctd\u003e10-30VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Off-state Voltage\u003c\/td\u003e\n\u003ctd\u003e5V dc max.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput On-state Current\u003c\/td\u003e\n\u003ctd\u003e11mA @ 30V max.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Off-state Current\u003c\/td\u003e\n\u003ctd\u003e1.5mA min.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNo. of Outputs\u003c\/td\u003e\n\u003ctd\u003eEight (8)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e20-30V dc @ 1A resistive max.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal Power\u003c\/td\u003e\n\u003ctd\u003e19.2-30V dc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Orientation\u003c\/td\u003e\n\u003ctd\u003eVertical and Horizontal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eIndustry Applications\u003c\/h2\u003e\u003cp\u003eThe 1791-8BR excels in applications requiring distributed I\/O near sensors and actuators. Typical uses include:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial handling systems\u003c\/strong\u003e – Monitor limit switches and control solenoid valves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging machinery\u003c\/strong\u003e – Interface with proximity sensors and motor starters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProcess control skids\u003c\/strong\u003e – Connect float switches and pilot lights.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIts compact form factor and RIO connectivity make it ideal for retrofitting older PLC-2\/PLC-3 systems, reducing wiring costs and downtime.\u003c\/p\u003e\u003ch2\u003eInstallation \u0026amp; Setup Guidance\u003c\/h2\u003e\u003cp\u003eMount the 1791-8BR on a standard DIN rail or directly to a panel using the integral mounting holes. Ensure the module is oriented vertically or horizontally as per the application layout. Connect incoming power to terminals +24 (1), RET +24 (3), and GND (2). For RIO communication, use terminals BLU (6), CLR (8), and SHD (7). Use 14-gauge stranded wire with a maximum insulation thickness of 3\/64 inches for signal termination. Avoid parallel output connections, as this lowers circuit resistance and can lead to malfunction.\u003c\/p\u003e\u003ch2\u003eMaintenance \u0026amp; Reliability\u003c\/h2\u003e\u003cp\u003eThe 1791-8BR requires minimal routine maintenance. Periodically inspect terminal connections for tightness and check for signs of corrosion or overheating. Because the module lacks internal fusing, install appropriate external fuses to protect both the module and connected devices. Pay special attention to surge currents – the module does not have surge limiting, so external protection is essential for long-term reliability. Regular cleaning of the enclosure and ensuring proper ventilation will extend service life.\u003c\/p\u003e\u003ch2\u003eCompatibility \u0026amp; Integration\u003c\/h2\u003e\u003cp\u003eThe 1791-8BR integrates with a wide range of Allen-Bradley controllers, including PLC-2, PLC-3, PLC-5\/20, and PLC-5. It supports RIO protocol and pairs with scanner modules such as 1771-SN, 1772-SD\/SD2, 1775-S5, 1775-SR5, and PLC-5VME (6008-LTV). This compatibility ensures seamless integration into existing Rockwell Automation architectures.\u003c\/p\u003e\u003ch2\u003eBuying Guide\u003c\/h2\u003e\u003cp\u003eWhen selecting the 1791-8BR, verify your controller's scanner compatibility and confirm the required input\/output voltage ranges. Ensure your power supply delivers 24VDC within the 19.2-30V dc range. For genuine Allen-Bradley parts and reliable service, consider PLC Source PRO as your trusted supplier.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default","offer_id":44453944229987,"sku":"1791-8BR","price":281.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0678\/8635\/0435\/files\/1791-0A16-c1_ae7a83dc-955a-408d-9994-c15e26bdf2aa.jpg?v=1786113282","url":"https:\/\/www.plcsourcepro.com\/he\/products\/1791-8br-industrial-automation-module-by-allen-bradley","provider":"PLC Source PRO","version":"1.0","type":"link"}