{"product_id":"allen-bradley-1771-a3b-plc-5-12-slot-i-o-chassis","title":"Allen-Bradley 1771-A3B PLC-5 12-Slot I\/O Chassis","description":"\u003ch2\u003eAllen-Bradley 1771-A3B PLC-5 12-Slot I\/O Chassis\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1771-A3B\u003c\/strong\u003e serves as the primary \u003cstrong\u003e1771-A3B\u003c\/strong\u003e I\/O Chassis utilized to execute module mounting, backplane power distribution, and parallel bus connection across PLC-5 I\/O platforms. The chassis provides twelve module slots for installation of compatible Bulletin 1771 digital, analog, and specialty modules.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1771-A3B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley \/ Rockwell Automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e13.01 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eBackplane current capacity: 24 A at 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Line\u003c\/td\u003e\n\u003ctd\u003ePLC-5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eI\/O Chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Slots\u003c\/td\u003e\n\u003ctd\u003e12 I\/O Slots\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Type\u003c\/td\u003e\n\u003ctd\u003e1771 Parallel Backplane\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Backplane Current\u003c\/td\u003e\n\u003ctd\u003e24 A at 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Type\u003c\/td\u003e\n\u003ctd\u003ePanel Mount \/ Rack Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure Type\u003c\/td\u003e\n\u003ctd\u003eOpen Style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Modules\u003c\/td\u003e\n\u003ctd\u003eBulletin 1771 I\/O Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Shock\u003c\/td\u003e\n\u003ctd\u003e15 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNon-Operating Shock\u003c\/td\u003e\n\u003ctd\u003e30 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVibration Rating\u003c\/td\u003e\n\u003ctd\u003e2 g at 10-500 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelative Humidity\u003c\/td\u003e\n\u003ctd\u003e5-95% non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAssembly Type\u003c\/td\u003e\n\u003ctd\u003eStand-Alone I\/O Chassis Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003ePLC-5 Backplane Bus and I\/O Density Scaling\u003c\/h3\u003e\n\u003cp\u003eThe 1771-A3B chassis provides a physical mounting structure and electrical backplane interface for PLC-5 controller systems. The 12-slot configuration supports increased I\/O density scaling by allowing installation of multiple Bulletin 1771 modules within a single rack assembly.\u003c\/p\u003e\n\u003cp\u003eThe chassis uses the PLC-5 parallel backplane bus for module communication and power distribution. Compatible modules exchange data through the backplane architecture while receiving operating power from the installed system power supply configuration.\u003c\/p\u003e\n\u003cp\u003eThe 1771-A3B supports industrial control rack installations requiring deterministic backplane communication behavior and compatibility with legacy PLC-5 module configurations.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How many I\/O modules can be installed in the 1771-A3B chassis?\u003cbr\u003eA: The 1771-A3B provides twelve I\/O module slots for compatible Bulletin 1771 PLC-5 modules.\u003c\/p\u003e\n\u003cp\u003eQ: Does the 1771-A3B include an integrated power supply?\u003cbr\u003eA: No. The chassis provides backplane connection and module mounting. System power is supplied through the configured PLC-5 power supply arrangement.\u003c\/p\u003e\n\u003cp\u003eQ: What type of mounting is supported by the 1771-A3B?\u003cbr\u003eA: The chassis supports panel mounting and rack mounting using the provided mounting features.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1771-A3B chassis on a rigid panel surface with proper mechanical support. Verify chassis alignment before inserting I\/O modules to prevent damage to backplane connectors.\u003c\/p\u003e\n\u003cp\u003eConnect the chassis according to PLC-5 system power and grounding requirements. Ensure the backplane power capacity is suitable for the installed module configuration.\u003c\/p\u003e\n\u003cp\u003eRoute field wiring separately from high-voltage and high-current conductors. Use appropriate cable shielding and grounding practices for analog or noise-sensitive signals.\u003c\/p\u003e\n\u003cp\u003eMaintain environmental protection according to the open-style enclosure design. Avoid installation locations with excessive dust, moisture, or conductive contaminants.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43668120698970,"sku":"1771-A3B","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1771-A3B2.jpg?v=1784259564","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1771-a3b-plc-5-12-slot-i-o-chassis","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}