{"product_id":"1771-ex-allen-bradley-i-o-chassis-extender","title":"1771-EX Allen-Bradley I\/O Chassis Extender","description":"\u003ch2\u003eAllen-Bradley 1771-EX I\/O Chassis Extender Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1771-EX\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1771-EX\u003c\/strong\u003e I\/O Chassis Extender Module, operates as a dedicated hardware component for extending physical I\/O slot capacity within Allen-Bradley PLC-1771 Universal I\/O chassis configurations. It provides backplane interface expansion, power distribution, and isolated communication paths between processor or adapter modules and additional I\/O assemblies.\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-EX\u003c\/td\u003e\n\u003c\/tr\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\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e2.68 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eReceives power from chassis backplane; consumption not specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eI\/O Chassis Extender Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley PLC-1771 Universal I\/O chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAddressing Support\u003c\/td\u003e\n\u003ctd\u003e1-slot, 2-slot, and 1\/2-slot addressing modes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation Type\u003c\/td\u003e\n\u003ctd\u003eExtender slot mounting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003eElectrical-optical isolation for noise reduction\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIndicators\u003c\/td\u003e\n\u003ctd\u003eFront-panel LED status indicators\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003ePLC-1771 Backplane Expansion and Bus Interface\u003c\/h3\u003e\n\u003cp\u003eThe 1771-EX extends PLC-1771 system architecture by providing a physical connection path between the main chassis and additional I\/O chassis sections. The module transfers backplane communication signals while maintaining power distribution continuity from the chassis supply.\u003c\/p\u003e\n\u003cp\u003eThe extender module supports PLC-1771 addressing configurations including 1-slot, 2-slot, and 1\/2-slot addressing modes, allowing additional I\/O density scaling within existing controller architectures. The solid-state interface design incorporates filtering and isolation circuits to reduce electrical interference between connected chassis segments.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What type of chassis configuration does the 1771-EX support?\u003cbr\u003eA: The 1771-EX is designed for Allen-Bradley PLC-1771 Universal I\/O chassis systems and provides expansion capability by linking additional I\/O module sections.\u003c\/p\u003e\n\u003cp\u003eQ: Does the 1771-EX provide independent field power output?\u003cbr\u003eA: No. The module receives and distributes power through the chassis backplane interface. Total system current loading must remain within the chassis power supply capability.\u003c\/p\u003e\n\u003cp\u003eQ: How does the module assist with electrical noise control?\u003cbr\u003eA: The 1771-EX incorporates electrical-optical isolation and filtering circuits to reduce signal interference between connected chassis components.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the 1771-EX in the designated extender position within the PLC-1771 chassis assembly. Verify chassis power is removed before module insertion or removal.\u003c\/p\u003e\n\u003cp\u003eConfirm that the extender connection path is correctly aligned with the backplane interface and that keying elements prevent incorrect module placement. Route communication and power wiring separately from high-voltage AC conductors to reduce electromagnetic interference.\u003c\/p\u003e\n\u003cp\u003eFor installations containing analog or low-level signal modules, maintain proper cable shielding practices. Connect shield drains according to the system grounding design and avoid creating unintended ground loops. Verify total backplane loading before adding additional I\/O modules to the expanded chassis configuration.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43668285947994,"sku":"1771-EX","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1771-EX2.jpg?v=1784271085","url":"https:\/\/www.plcmasters.com\/products\/1771-ex-allen-bradley-i-o-chassis-extender","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}