{"product_id":"allen-bradley-plc-5-1771-a4b-b-16-slot-i-o-chassis","title":"Allen-Bradley PLC-5 1771-A4B B 16 Slot I\/o Chassis","description":"\u003cp\u003eConfigured for high-density modular I\/O integration in PLC-5 system architectures, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1771-A4B\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(\u003cstrong\u003e1771A4B\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUniversal Input\/Output Chassis) provides direct physical backplane execution for 16-slot module configurations.\u003c\/p\u003e\n\u003ch3\u003eModel Matrix\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e1771-A4B: Standard catalog number for the 16-slot universal I\/O chassis.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUniversal Design: Engineered to accommodate various 1771 series I\/O modules, communication adapters, and processor configurations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\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\u003eModel\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1771-A4B\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBrand\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAllen-Bradley\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eOrigin\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUSA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eWeight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e6.24 kg\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eShipping Dimensions\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e61 x 17 x 31 cm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eI\/O Slots\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e16\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBackplane Current\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e24 A at 5 VDC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eOperating Temp\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 deg C to 60 deg C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eHumidity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e5-95% RH non-condensing\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eIndustrial Control Integration\u003c\/h3\u003e\n\u003cp\u003eThe 1771-A4B chassis utilizes a backplane bus communication velocity architecture optimized for deterministic PLC-5 operations. It supports I\/O density scaling via 1\/2-slot addressing and accommodates diverse module types, including analog, digital, and high-speed motion controllers. Firmware flash compatibility is governed by the specific adapter or processor module installed in the leftmost slot. The backplane design ensures signal integrity across all 16 slots, provided that cumulative load does not exceed the 24 A current limit at 5 VDC.\u003c\/p\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e1771-A4B 16-Slot I\/O Chassis.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNote: This unit does not include an integral power supply module; external power supplies must be sourced separately.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHardware includes 36 plastic keying bands for module-to-slot configuration security.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eGrounding: Establish a central ground bus within the enclosure. Connect the chassis to this bus using 1-inch (2.54 cm) copper braid or 8 AWG copper wire.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eContact Integrity: Scrape paint from the back-panel mounting surface to ensure a low-impedance electrical bond. Secure ground lugs using nuts and star washers to prevent loosening.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePlacement: The leftmost slot is reserved exclusively for the processor or I\/O adapter module. Other modules may occupy any of the remaining 15 slots.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEnvironment: Intended for Pollution Degree 2, Overvoltage Category II industrial environments at altitudes up to 2000 meters.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eCan modules be hot-swapped while the chassis is powered? No, the 1771 series architecture generally requires the system to be de-energized to prevent electrical shorts or backplane damage.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the total current limit for this chassis? The backplane supports a maximum of 24 A at 5 VDC.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCan I use a power supply rated at 10 A? Yes, external power supplies for this chassis must be rated between 6.5 A and 16 A, depending on the I\/O load.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat if I exceed the 2000-meter altitude limit? Operation above 2000 meters may require output power derating; consult the engineering manual for specific curves.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAre the keying bands required for operation? Yes, 36 keying bands are necessary to prevent the insertion of incompatible modules into configured slots.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIs the chassis compatible with PLC-5\/40 processors? Yes, the chassis supports various PLC-5 processors, provided the processor occupies the leftmost slot.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow do I prevent EMI between slots? Maintain proper spacing and ensure the chassis is firmly bonded to a common cabinet ground bus.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDoes this chassis support communication modules? Yes, communication modules can occupy any slot except the leftmost dedicated slot.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":46066442043565,"sku":"1771-A4B","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/1771-A4b-1.jpg?v=1781170404","url":"https:\/\/www.maxwellplc.com\/products\/allen-bradley-plc-5-1771-a4b-b-16-slot-i-o-chassis","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}