{"product_id":"1791-oa16-allen-bradley-1791-block-i-o-digital-ac-output-module","title":"1791-OA16 | Allen Bradley | 1791 Block I\/O Digital AC Output Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen Bradley 1791-OA16\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eprovides a high-density, self-contained solution for distributed digital control. As a primary member of the 1791 Block I\/O family, this module eliminates the need for a separate rack and power supply, interfacing directly with PLC-2, PLC-3, and PLC-5 processors. We supply this unit as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eoriginal stock, offering a vital lifecycle extension for legacy automation systems that require precise 120VAC load switching.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThe 1791-OA16 utilizes a dual-group architecture to manage 16 independent AC outputs.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAllen Bradley (Rockwell Automation)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOutput Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eDigital AC Output\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNumber of Outputs\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e16 (Two groups of 8)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNominal Voltage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e120 VAC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Voltage Range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e20–132 VAC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMax. On-State Current\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e500 mA per output (at 120V)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMinimum Load Current\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e50 mA per output\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSurge Current\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e10 A for 50 ms (repeatable every 2 sec)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOn-State Voltage Drop\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1.5V peak @ 300mA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOFF State Leakage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3 mA (max)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eExternal Power Requirement\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e85–132 VAC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSelf-Contained Efficiency:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 1791-OA16 integrates the I\/O adapter, power supply, and terminal block into a single footprint. This \"Block\" design saves significant DIN rail space and reduces the total cost of installation by removing the requirement for an I\/O chassis.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh Surge Handling:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIndustrial inductive loads like solenoids and motor starters often generate high inrush currents. The 1791-OA16 handles 10A surges for up to 50ms, protecting the internal circuitry while ensuring successful activation of heavy-duty field devices.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eFlexible Mounting Geometry:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eEngineers can mount the block either vertically or horizontally. This flexibility allows the module to fit into shallow junction boxes or narrow side-panels where traditional rack-mounted I\/O cannot go.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRobust Timing for Synchronized Control:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module achieves a fast turn-on delay of 1.0 ms. For de-energizing, it follows zero-cross principles (8.3ms @ 60Hz), which reduces electrical noise and extends the mechanical life of connected AC actuators.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan the 1791-OA16 replace a standard 1771 rack-mounted AC output module?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFunctionally, yes. While the 1771 series requires a chassis, the 1791-OA16 performs the same 120VAC output switching but as a standalone block. It communicates via the same Remote I\/O (RIO) link, making it an excellent choice for adding points to an existing PLC-5 system without adding a new rack.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat should I consider regarding the 3mA leakage current?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSmall AC loads, such as high-impedance relays or LED indicators, may remain \"ON\" due to the 3mA leakage current even when the output is technically \"OFF.\" If using very low-current field devices, install a bleed resistor (load resistor) across the output to ensure the device drops below its holding current.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIs the external 85-132V AC power required for the logic side or the load side?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe external power source drives the internal logic and the communication circuitry of the block. You must provide a stable 120VAC source to the power terminals to maintain the RIO link, independent of the voltage applied to the output loads.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this module support individual channel isolation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 16 outputs are organized into two groups of eight. While the groups are isolated from each other, the eight channels within a single group share a common return. Ensure your wiring plan accounts for this shared common to avoid accidental backfeeding.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52787858997557,"sku":"1791-OA16","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/1791-OA16.png?v=1777257621","url":"https:\/\/www.5gplc.com\/products\/1791-oa16-allen-bradley-1791-block-i-o-digital-ac-output-module","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}