{"product_id":"1771-a3b1-plc-5-i-o-rack-5v-dc-backplane-assembly","title":"1771-A3B1 PLC-5 I\/O Rack 5V DC Backplane Assembly","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1771-A3B1\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efunctions as a high-capacity structural backbone for the PLC-5 platform. This 12-slot universal I\/O chassis houses and powers a diverse range of 1771-series modules, including digital, analog, and specialized motion control units. It provides the essential high-speed communication link between the processor and distributed field devices, supporting large-scale automation architectures that require high-density I\/O expansion.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThis unit is\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand ships in original factory condition to ensure maximum service life for legacy infrastructure.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDetails\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\u003eNumber of Slots\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e12 Module Slots\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackplane Current Capacity\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e24 Amps at 5V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eChassis Width\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e19.0 inches (standard rack profile)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMounting Configuration\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eBack Panel Mount\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInput Voltage (Max)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e5.25V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 60 degrees C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eStorage Temperature\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-40 to 85 degrees C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eVibration Resistance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2 g at 10-500 Hz\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eShock Resistance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e15 g (operating) \/ 30 g (non-operating)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eDimensions (HxWxD)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e12.4 x 19.0 x 7.6 inches\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eRelative Humidity\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e5 to 95 percent non-condensing\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\u003cp\u003eThe 1771-A3B1 addresses specific industrial deployment challenges through precision engineering:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Current Distribution:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 24A backplane capacity supports a full load of high-power modules, such as high-density AC outputs or intelligent specialty modules, without voltage drops or thermal instability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eEMI\/RFI Shielding:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe heavy-duty steel construction provides a grounded shield against electromagnetic interference, protecting low-level analog signals from the electrical noise typical in motor control centers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOptimized Thermal Dissipation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe open-style design facilitates natural convection. When engineers follow the recommended vertical and horizontal clearances, the chassis prevents localized hotspots, extending the lifespan of the installed PLC-5 modules.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSimplified Maintenance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePre-drilled panel mounting holes and standard 19-inch dimensions allow for rapid integration into existing NEMA enclosures. The integrated ground bus simplifies safety bonding and reduces wiring complexity.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the 1771-A3B1 support 1\/2-slot addressing?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. You configure the addressing modes (1\/2-slot, 1-slot, or 2-slot) via DIP switches on the backplane. This allows you to optimize I\/O density and memory usage based on your specific PLC-5 processor requirements.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I install this unit in a standard 19-inch electronic rack?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhile the chassis width is 19 inches, it is primarily designed for back-panel mounting inside an enclosure. You must ensure the enclosure provides adequate depth (at least 7.6 inches plus wiring arm clearance) and sufficient airflow.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat power supply works with the 1771-A3B1?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis chassis requires a 1771-series power supply. Common options include the 1771-P4 or 1771-P7 modules, or standalone power supplies connected via the power terminal strip on the backplane. Ensure the selected supply can provide the 24A required for a fully populated rack.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this chassis compatible with newer ControlLogix modules?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The 1771-A3B1 specifically supports 1771-series I\/O modules and PLC-5 or SLC-500 (via 1747-ASB) adapters. For ControlLogix systems, you must use 1756-series chassis.\u003c\/p\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":43377667571802,"sku":"1771-A3B1","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/20_7c2fe4b6-9280-4dc4-8517-b70e9eea8d6e.jpg?v=1778811598","url":"https:\/\/www.spareoil.com\/products\/1771-a3b1-plc-5-i-o-rack-5v-dc-backplane-assembly","provider":"SpareOil Automation","version":"1.0","type":"link"}