{"product_id":"allen-bradley-1756-a17-b-controllogix-chassis","title":"Allen-Bradley 1756-A17\/B ControlLogix Chassis","description":"\u003ch1 class=\"PDq2pG_selectionAnchorContainer\"\u003eAllen-Bradley 1756-A17\/B ControlLogix Chassis\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h1\u003e\n\u003cp\u003eConfigured for modular I\/O and controller backplane interconnection in ControlLogix systems, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1756-A17\/B\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(\u003cstrong\u003e1756-A17\/B\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePLC chassis rack) provides direct electrical distribution and high-speed module-to-module communication across a 17-slot backplane architecture. The chassis supports horizontal-only installation and distributes 5.1 VDC, 3.3 VDC, 1.2 VDC, and 24 VDC power rails to installed ControlLogix modules via the integrated backplane bus.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\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\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\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\u003e1756-A17\/B\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\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e2.27 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e50.8 × 101.6 × 20.3 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003eIEC 60068-2-1 \/ 60068-2-2 compliant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eUp to 6 W (chassis dissipation)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSlots\u003c\/td\u003e\n\u003ctd\u003e17 module slots\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Voltage\u003c\/td\u003e\n\u003ctd\u003e1.2 VDC \/ 3.3 VDC \/ 5.1 VDC \/ 24 VDC rails\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e5.1 VDC: 15 A chassis max; 3.3 VDC: 4 A slot max; 24 VDC: 2.8 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Type\u003c\/td\u003e\n\u003ctd\u003eHorizontal back-panel mounting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrounding\u003c\/td\u003e\n\u003ctd\u003e8 AWG functional earth, 14 AWG protective earth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure\u003c\/td\u003e\n\u003ctd\u003eOpen-style rack (cabinet required)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eControlLogix Backplane Power Distribution and Bus Structure\u003c\/h3\u003e\n\u003cp\u003eThe 1756-A17\/B chassis implements a shared backplane architecture where all installed modules draw regulated DC rails from the chassis power supply interface. Backplane bus communication is handled through deterministic ControlLogix high-speed signaling, supporting synchronized I\/O data exchange and controller task scheduling across multiple slots.\u003c\/p\u003e\n\u003cp\u003eThe 17-slot density requires controlled I\/O segmentation to maintain backplane current compliance, particularly on the 5.1 VDC rail where total chassis load is limited to 15 A. Slot-level current constraints enforce module distribution planning for mixed analog, digital, and communication modules.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Can modules be hot-swapped while the chassis is energized?\u003cbr\u003eA: Hot-swap capability depends on installed module type. The chassis backplane remains powered; module-level removal requires adherence to ControlLogix safe removal sequencing to avoid backplane data disruption.\u003c\/p\u003e\n\u003cp\u003eQ: Does each slot independently limit current consumption?\u003cbr\u003eA: Yes. Slot-level limits apply for 3.3 VDC, 5.1 VDC, and 24 VDC rails, independent of total chassis current limits, preventing localized overcurrent conditions.\u003c\/p\u003e\n\u003cp\u003eQ: Does the chassis support redundant power supply configurations?\u003cbr\u003eA: Redundancy behavior is defined by the installed ControlLogix power supply modules; the chassis itself provides passive distribution without redundancy logic.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the chassis on a rigid back-panel using all designated mounting points. Maintain horizontal alignment to ensure uniform backplane connector engagement across all 17 slots. Ground the chassis using 8 AWG functional earth conductor and 14 AWG protective earth conductor as specified.\u003c\/p\u003e\n\u003cp\u003eRoute backplane and field wiring separately to avoid coupling noise into module signal paths. Ensure cabinet ventilation supports IEC thermal limits. Do not leave unused slots open without approved slot fillers to maintain airflow and mechanical stability.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43568943464538,"sku":"1756-A17\/B","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1756-A171.jpg?v=1782703605","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1756-a17-b-controllogix-chassis","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}