{"product_id":"allen-bradley-1756-a7-c-controllogix-chassis-module","title":"Allen-Bradley 1756-A7\/C ControlLogix Chassis Module","description":"\u003ch1 class=\"PDq2pG_selectionAnchorContainer\"\u003eAllen-Bradley 1756-A7\/C 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-A7\/C\u003c\/strong\u003e, also cataloged as the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1756-A7\/C 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 power routing across ControlLogix platforms. The chassis implements a 7-slot backplane structure supporting electrical bus coupling for processor, I\/O, and communication modules within a Series C mechanical revision.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eNo validated sub-suffix segmentation is defined for the 1756-A7\/C chassis.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e1756-A7\/C: ControlLogix chassis platform, 7-slot backplane structure, Series C revision baseline\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-A7\/C\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\u003e0.9 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e15.2 cm x 15.2 cm x 27.9 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eMax power dissipation 4 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 Voltage (1.2 V DC)\u003c\/td\u003e\n\u003ctd\u003e1.5 A chassis current\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Voltage (3.3 V DC)\u003c\/td\u003e\n\u003ctd\u003e4 A chassis \/ 4 A per slot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Voltage (5.1 V DC)\u003c\/td\u003e\n\u003ctd\u003e15 A chassis \/ 6 A per slot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Voltage (24 V DC)\u003c\/td\u003e\n\u003ctd\u003e2.8 A chassis \/ 2.8 A per slot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eHorizontal panel mount only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure Rating\u003c\/td\u003e\n\u003ctd\u003eNone (open chassis structure)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrounding\u003c\/td\u003e\n\u003ctd\u003eFunctional earth 8 AWG, protective earth 14 AWG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch3\u003eControlLogix Backplane Electrical Bus Architecture (Series C Chassis Behavior)\u003c\/h3\u003e\n\u003cp\u003eThe 1756-A7\/C implements a multi-domain backplane power distribution structure segmented across 1.2 V DC, 3.3 V DC, 5.1 V DC, and 24 V DC rails. Each slot is electrically coupled through a shared bus plane, enabling deterministic module-to-module communication governed by ControlLogix internal arbitration timing.\u003c\/p\u003e\n\u003cp\u003eSeries C revision defines reduced power dissipation envelope at 4 W maximum chassis thermal load, requiring thermal balancing across installed modules rather than active chassis-level heat management. Backplane impedance is maintained through fixed connector geometry, ensuring consistent signal propagation delay across all seven slots.\u003c\/p\u003e\n\u003cp\u003eElectrical isolation is not implemented at chassis level; isolation boundaries are defined by installed module hardware and system power supply architecture. Grounding configuration uses dual-path reference separation via functional earth (8 AWG) and protective earth (14 AWG), stabilizing backplane reference potential under mixed digital and analog load switching conditions.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1756-A7\/C support module hot-swap operation?\u003cbr\u003eA: Yes. ControlLogix architecture supports controlled hot-swap depending on module type. Backplane remains energized during insertion if module firmware and configuration permit it.\u003c\/p\u003e\n\u003cp\u003eQ: Is backplane communication speed dependent on chassis revision (Series C)?\u003cbr\u003eA: No. Communication timing is determined by ControlLogix controller and backplane arbitration logic. The chassis provides passive electrical interconnection only.\u003c\/p\u003e\n\u003cp\u003eQ: Does the chassis provide electrical isolation between slots?\u003cbr\u003eA: No. Isolation is implemented at module level or via external power supply design, not within the 1756-A7\/C chassis.\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 integrity.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEnsure rigid panel mounting to prevent mechanical stress on backplane mating interfaces during module insertion.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMaintain separation between power cabling and communication wiring to reduce coupling into backplane reference plane.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eApply specified grounding conductors (functional earth and protective earth) before system energization.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eVerify clearance above and below chassis to support passive convection cooling across installed modules.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eInsert modules only when aligned with guide rails to prevent backplane connector pin deformation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43572351664218,"sku":"1756-A7\/C","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1756-A72.jpg?v=1778667100","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1756-a7-c-controllogix-chassis-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}