{"product_id":"allen-bradley-1771-a4b-plc-5-16-slot-i-o-chassis-rack","title":"Allen-Bradley 1771-A4B PLC-5 16-Slot I\/O Chassis Rack","description":"\u003ch3\u003e\u003cstrong\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Allen-Bradley\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-A4B\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003euniversal chassis is a modular PLC rack engineered for PLC-5 and 1771 Series control systems. Designed with a 16-slot architecture, this chassis supports a wide range of processor, communication, power supply, and I\/O modules for distributed industrial automation applications.\u003c\/p\u003e\n\u003cp\u003eThe chassis provides reliable backplane communication and flexible module allocation for medium to large-scale control systems. Its rear panel mounting configuration simplifies cabinet integration while maintaining grounding continuity and stable module retention.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eSupports up to 16 installed modules\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCompatible with Allen-Bradley PLC-5 systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDesigned for universal 1771 I\/O module integration\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSupports half-slot addressing configuration\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHeavy-duty industrial backplane construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProcessor installation supported in leftmost slot\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCompatible with multiple external and internal power supply configurations\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eRear panel mounting arrangement for control cabinets\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eGrounding support for improved electrical stability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDesigned for industrial process and machine automation systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth class=\"last:pe-10\"\u003eSpecification\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e1771-A4B\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eUniversal I\/O Chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003ePLC-5 \/ 1771 Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Slots\u003c\/td\u003e\n\u003ctd\u003e16 Slots\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Type\u003c\/td\u003e\n\u003ctd\u003eUniversal PLC Rack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e24 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Voltage\u003c\/td\u003e\n\u003ctd\u003e5.25 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAddressing Capability\u003c\/td\u003e\n\u003ctd\u003e1\/2-Slot Addressing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Assigned I\/O Racks\u003c\/td\u003e\n\u003ctd\u003e4 Racks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Method\u003c\/td\u003e\n\u003ctd\u003eRear Panel Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrounding Support\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Processor Power Ratings\u003c\/td\u003e\n\u003ctd\u003e2–4 A Integral Power Supplies\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Power Supply Modules\u003c\/td\u003e\n\u003ctd\u003e3–8 A Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible External Power Supplies\u003c\/td\u003e\n\u003ctd\u003e6.5–16 A Units\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessor Installation Position\u003c\/td\u003e\n\u003ctd\u003eLeftmost Slot Only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Adapter Module Position\u003c\/td\u003e\n\u003ctd\u003eLeftmost Slot Supported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Module Positions\u003c\/td\u003e\n\u003ctd\u003eAll Slots Except Leftmost\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Module Positions\u003c\/td\u003e\n\u003ctd\u003eAll Slots Except Leftmost\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply Module Positions\u003c\/td\u003e\n\u003ctd\u003eAll Slots Except Leftmost\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired Keying Bands\u003c\/td\u003e\n\u003ctd\u003e36 Plastic Bands\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e13.36 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation Information\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-A4B\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003echassis requires proper mechanical fastening hardware during installation, including cup washers, star washers, flat washers, and captive lock nuts. Correct keying band configuration is recommended to prevent incorrect module insertion.\u003c\/p\u003e\n\u003cp\u003eThe chassis is intended for grounded industrial enclosures and should be installed according to Allen-Bradley PLC-5 system guidelines.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTypical Applications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eFactory automation systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePLC-5 migration and expansion projects\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMaterial handling systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIndustrial process control\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePackaging machinery\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAutomotive manufacturing lines\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWater and wastewater control systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDistributed I\/O architectures\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Allen-Bradley\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1771-A4B\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis compatible with:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003ePLC-5 processors\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e1771 analog I\/O modules\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e1771 discrete input and output modules\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e1771 communication modules\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e1771 power supply modules\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eRemote I\/O adapter modules\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ch3\u003e\u003cstrong\u003eWhich slot is reserved for the processor module?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe leftmost slot is designated for processor or I\/O adapter module installation.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eCan communication modules be installed in any slot?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eCommunication modules may be installed in all chassis positions except the leftmost slot.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDoes the chassis support grounding?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eYes. The chassis includes grounding support for industrial control cabinet installations.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat addressing mode does the chassis support?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe chassis supports 1\/2-slot addressing with a maximum assignment of four I\/O racks.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eIs the power supply integrated into the chassis?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eNo. The chassis requires compatible external or modular power supply units depending on system configuration.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43378739937370,"sku":"1771-A4B","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1771-A4B2.jpg?v=1778824943","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1771-a4b-plc-5-16-slot-i-o-chassis-rack","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}