{"product_id":"allen-bradley-1756-a7k-controllogix-chassis-module","title":"Allen-Bradley 1756-A7K ControlLogix Chassis Module","description":"\u003ch1 class=\"PDq2pG_selectionAnchorContainer\"\u003eAllen-Bradley 1756-A7K ControlLogix Chassis Module\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h1\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1756-A7K\u003c\/strong\u003e, also cataloged as the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-A7K ControlLogix Chassis\u003c\/strong\u003e, serves as the primary\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eControlLogix backplane chassis\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eutilized to execute module slot interconnection and distributed backplane power routing across ControlLogix PLC platforms. The 7-slot chassis provides passive electrical bus coupling for installed ControlLogix CPU, I\/O, and communication modules in a horizontal rack configuration.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eNo formal suffix decomposition is defined for the 1756-A7K chassis.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e1756-A7K: ControlLogix chassis platform, 7-slot backplane structure, conformal coated mechanical assembly variant\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\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-A7K\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\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.88 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eMax 4.5 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSlots\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current (5 V DC)\u003c\/td\u003e\n\u003ctd\u003e10 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current (24 V DC)\u003c\/td\u003e\n\u003ctd\u003e2.8 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eHorizontal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure\u003c\/td\u003e\n\u003ctd\u003eOpen frame\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating\u003c\/td\u003e\n\u003ctd\u003eConformal coat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eChassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch3\u003eControlLogix Backplane Bus and Power Distribution Architecture (1756 Series Rack Behavior)\u003c\/h3\u003e\n\u003cp\u003eThe 1756-A7K implements a passive ControlLogix backplane structure supporting deterministic module-to-module communication via shared electrical bus planes. The chassis does not perform signal processing or arbitration logic; instead, it provides fixed impedance routing paths for 5 V DC and 24 V DC power domains.\u003c\/p\u003e\n\u003cp\u003eBackplane current allocation is segmented by voltage rail, with 5 V DC domain supporting up to 10 A and 24 V DC domain supporting up to 2.8 A. Power distribution stability depends on installed power supply module and slot-level consumption balance.\u003c\/p\u003e\n\u003cp\u003eThe conformal coating layer provides surface-level protection against conductive contamination and humidity-induced leakage paths, without altering backplane electrical characteristics. Mechanical slot geometry enforces fixed alignment of ControlLogix modules to maintain signal pin integrity across repeated insertion cycles.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1756-A7K chassis provide electrical isolation between modules?\u003cbr\u003eA: No. Isolation is not implemented at chassis level. Isolation is determined by installed ControlLogix modules and system power supply architecture.\u003c\/p\u003e\n\u003cp\u003eQ: Can modules be inserted while the system is energized?\u003cbr\u003eA: Yes, ControlLogix architecture supports hot-swap operation, but insertion must comply with module-specific operating conditions and system configuration.\u003c\/p\u003e\n\u003cp\u003eQ: Does conformal coating affect backplane electrical performance?\u003cbr\u003eA: No. The coating is applied to external surfaces and does not modify backplane impedance or electrical connectivity.\u003c\/p\u003e\n\u003chr\u003e\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eInstall chassis in horizontal orientation only to maintain backplane connector alignment.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEnsure rigid panel mounting to prevent mechanical stress on slot connectors during module insertion\/removal.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMaintain separation between power cabling and communication wiring to reduce electromagnetic coupling into backplane conductors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eVerify grounding continuity prior to energizing system to stabilize reference potential across chassis assembly.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAvoid partial insertion of modules under energized conditions unless hot-swap procedure is explicitly supported by module type.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEnsure cabinet clearance to support passive airflow across installed modules and reduce thermal accumulation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43572352712794,"sku":"1756-A7K","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1756-A4K.jpg?v=1782722828","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1756-a7k-controllogix-chassis-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}