{"product_id":"1756-a4-allen-bradley-controllogix-chassis-4-slot-backplane","title":"1756-A4 Allen-Bradley ControlLogix Chassis | 4-Slot Backplane","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview | ControlLogix Chassis Infrastructure\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e\u003cspan style=\"color: #c0392b;\"\u003eAllen-Bradley 1756-A4\u003c\/span\u003e\u003c\/strong\u003e is a four-slot chassis for the \u003cstrong\u003eRockwell Automation ControlLogix series\u003c\/strong\u003e. It provides the mechanical mounting structure and electronic backplane for compatible automation modules.\u003c\/p\u003e\n\n\u003cp\u003eThe chassis connects installed modules through a shared backplane. This backplane distributes power and supports communication between the controller, I\/O modules, and compatible communication devices.\u003c\/p\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e1756-A4\u003c\/strong\u003e suits compact control panels, distributed I\/O stations, and small ControlLogix installations. Its horizontal mounting arrangement supports integration into suitable industrial cabinets.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Rockwell Automation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Allen-Bradley\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCatalog number:\u003c\/strong\u003e \u003cspan style=\"color: #c0392b;\"\u003e\u003cstrong\u003e1756-A4\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct family:\u003c\/strong\u003e ControlLogix\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardware type:\u003c\/strong\u003e Four-slot chassis\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary function:\u003c\/strong\u003e Module mounting, backplane communication, and power distribution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting orientation:\u003c\/strong\u003e Horizontal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnclosure style:\u003c\/strong\u003e Open-style chassis for panel installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBackplane Architecture | Four Slots, One Shared Platform\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e1756-A4\u003c\/strong\u003e provides four module slots. Engineers can arrange compatible processors, I\/O modules, and communication modules according to the system design.\u003c\/p\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eChassis Element\u003c\/th\u003e\n\u003cth\u003eEngineering Function\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFour module slots\u003c\/td\u003e\n\u003ctd\u003eAccommodate compatible ControlLogix modules.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectronic backplane\u003c\/td\u003e\n\u003ctd\u003eProvides inter-module communication and power distribution.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower supply interface\u003c\/td\u003e\n\u003ctd\u003eSupports installation of a compatible chassis power supply.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePanel mounting structure\u003c\/td\u003e\n\u003ctd\u003eSecures the chassis inside a suitable control cabinet.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSlot arrangement\u003c\/td\u003e\n\u003ctd\u003eSupports compact local control or remote I\/O configurations.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eSlot planning note:\u003c\/strong\u003e The chassis has four module positions. The power supply mounts separately and does not occupy a chassis slot. Allow space for wiring, cooling, and module removal.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications | 1756-A4\u003c\/strong\u003e\u003c\/h3\u003e\n\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\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eRockwell Automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e1756-A4\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eControlLogix\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\u003ctr\u003e\n\u003ctd\u003eNumber of slots\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting orientation\u003c\/td\u003e\n\u003ctd\u003eHorizontal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure style\u003c\/td\u003e\n\u003ctd\u003eOpen\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane current at 1.2 VDC\u003c\/td\u003e\n\u003ctd\u003e1.5 A maximum per chassis and slot, as specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane current at 3.3 VDC\u003c\/td\u003e\n\u003ctd\u003e4 A maximum per chassis and slot, as specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane current at 5.1 VDC\u003c\/td\u003e\n\u003ctd\u003e15 A maximum per chassis; 6 A maximum per slot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane current at 24 VDC\u003c\/td\u003e\n\u003ctd\u003e2.8 A maximum per chassis and slot, as specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower consumption\u003c\/td\u003e\n\u003ctd\u003e1.8 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower dissipation\u003c\/td\u003e\n\u003ctd\u003e6.1 BTU\/hour in the detailed specification provided\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (W × H × D)\u003c\/td\u003e\n\u003ctd\u003e263 × 169 × 145 mm (10.35 × 6.65 × 5.71 in.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum cabinet dimensions (W × H × D)\u003c\/td\u003e\n\u003ctd\u003e507 × 507 × 203 mm (20 × 20 × 8 in.), as listed in the supplied data\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApproximate weight\u003c\/td\u003e\n\u003ctd\u003e0.75 kg (1.7 lb)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReported hardware series\u003c\/td\u003e\n\u003ctd\u003eA, B, C; verify the specific unit label\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eSpecification verification:\u003c\/strong\u003e The supplied information also lists a 4 W maximum power dissipation and a 10 A backplane rating at 5 VDC. These values conflict with the more detailed figures above. Confirm the applicable electrical ratings in the official documentation for the exact chassis revision before engineering approval.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatible Modules and Power Supply Selection\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eThe chassis can accommodate compatible ControlLogix modules, subject to module-specific requirements and system configuration.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eController modules:\u003c\/strong\u003e Compatible ControlLogix processors for local control applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI\/O modules:\u003c\/strong\u003e Supported digital and analog modules for field signal acquisition and output control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommunication modules:\u003c\/strong\u003e Compatible network interfaces for communication with remote I\/O and other automation devices.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecialty modules:\u003c\/strong\u003e Supported application-specific modules, subject to hardware and firmware compatibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower supplies:\u003c\/strong\u003e The supplied product information lists 1756-PA72, 1756-PB72, 1756-PA75, 1756-PB75, 1756-PC75, and 1756-PH75 as compatible candidates.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCheck the official compatibility documentation before selecting a power supply or installing a module. Confirm the required backplane voltage, current demand, chassis series, and module placement.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant distinction:\u003c\/strong\u003e The 1756-A4 is a chassis, not a controller or standalone power supply. It cannot execute control logic without a compatible controller in the overall system architecture.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eInstallation and Panel Integration\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfirm the layout:\u003c\/strong\u003e Reserve four slots for the planned modules and verify the complete cabinet dimensions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrepare the mounting panel:\u003c\/strong\u003e Provide a rigid, level back panel with suitable clearances.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall horizontally:\u003c\/strong\u003e Follow the manufacturer's mounting instructions and specified orientation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit the power supply:\u003c\/strong\u003e Install a compatible supply using the approved interface and mounting arrangement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck module loading:\u003c\/strong\u003e Calculate backplane current requirements at every applicable voltage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall modules:\u003c\/strong\u003e Follow the manufacturer's instructions for module insertion, retention, and grounding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInspect wiring clearance:\u003c\/strong\u003e Keep wiring away from obstructed airflow paths and module removal areas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify before energizing:\u003c\/strong\u003e Check power connections, module seating, grounding, and cabinet conditions.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003cp\u003eFollow site electrical safety procedures during installation. Do not assume that every module supports removal and insertion under power simply because the chassis supports a particular system feature.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eSystem Integration | Local and Distributed I\/O\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e1756-A4\u003c\/strong\u003e can form part of a local ControlLogix system or a compatible distributed I\/O architecture.\u003c\/p\u003e\n\n\u003cp\u003eIn a local arrangement, the chassis houses the controller and selected I\/O or communication modules. Field devices connect through the appropriate I\/O hardware.\u003c\/p\u003e\n\n\u003cp\u003eIn a distributed arrangement, the chassis can host supported I\/O modules and a compatible communication adapter. A network links the remote station to the controller system.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachine control:\u003c\/strong\u003e Organize a compact controller and its associated I\/O hardware.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemote instrumentation:\u003c\/strong\u003e Mount supported I\/O modules near field instruments to simplify signal routing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProcess systems:\u003c\/strong\u003e Group compatible communication and specialty modules in one cabinet.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem expansion:\u003c\/strong\u003e Add a separate chassis when the current slot count or backplane capacity cannot support additional modules.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eEach chassis requires an appropriate power supply. Remote I\/O arrangements also require compatible network hardware, addressing, and configuration.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eDiagnostic Capabilities and Field Troubleshooting\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eThe chassis provides the physical backplane infrastructure. It does not independently diagnose process signals or execute application logic. Engineers should use controller, power supply, communication, and I\/O diagnostics to isolate system faults.\u003c\/p\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eObserved Symptom\u003c\/th\u003e\n\u003cth\u003eRecommended Checks\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeveral modules fail to start\u003c\/td\u003e\n\u003ctd\u003eCheck the power supply, chassis seating, backplane loading, and module compatibility.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOne module remains unavailable\u003c\/td\u003e\n\u003ctd\u003eInspect its seating, status indicators, configuration, and compatibility requirements.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRemote I\/O communication fails\u003c\/td\u003e\n\u003ctd\u003eCheck the communication adapter, network cabling, addressing, and controller configuration.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntermittent module faults occur\u003c\/td\u003e\n\u003ctd\u003eInspect power stability, cabinet temperature, grounding, and connector seating.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNew modules exceed system capacity\u003c\/td\u003e\n\u003ctd\u003eRecalculate slot usage, backplane current, power supply capacity, and module compatibility.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eField example:\u003c\/strong\u003e An engineer installs an additional analog input module, but the system reports a module fault. Before replacing the chassis, the engineer checks the module's current demand, the power supply load, and the configured slot assignment. This sequence helps distinguish a power limitation from a configuration or hardware problem.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eGlobal PLC Spare HUB's Insight\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eIn practical ControlLogix installations, chassis selection affects more than the number of available slots. Backplane loading, power supply compatibility, cabinet clearance, and future expansion all influence system reliability.\u003c\/p\u003e\n\n\u003cp\u003eFor example, a four-slot chassis may suit a compact machine with one controller, one communication module, and two I\/O modules. However, an additional specialty module may require a different slot plan or a larger chassis.\u003c\/p\u003e\n\n\u003cp\u003eBefore ordering a replacement, record the existing chassis catalog number, hardware series, installed module list, and power supply model. Compare these details against the approved system design.\u003c\/p\u003e\n\n\u003cp\u003eFor troubleshooting, inspect shared infrastructure before replacing individual modules. A common power or backplane issue can affect multiple devices at once. Follow the manufacturer's procedures and site safety requirements when investigating suspected chassis faults.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eSelection Guide | Is the 1756-A4 Suitable?\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChoose this model\u003c\/strong\u003e when the design requires four compatible ControlLogix module slots.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsider a larger chassis\u003c\/strong\u003e when the module count, expansion plan, or backplane requirements exceed the available capacity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify the power supply\u003c\/strong\u003e when adding high-demand modules or replacing existing hardware.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck the series\u003c\/strong\u003e when integrating older modules with a particular chassis revision.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReview remote I\/O requirements\u003c\/strong\u003e when locating modules away from the main controller cabinet.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eSend the existing chassis label and module list when requesting a replacement. This information helps confirm the correct hardware and avoid an incompatible purchase.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003ePackaging, Shipping, and Warranty\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct supplied:\u003c\/strong\u003e Allen-Bradley 1756-A4 four-slot ControlLogix chassis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccessories:\u003c\/strong\u003e Power supply, controller, modules, and slot fillers are not included unless explicitly listed in the quotation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Protective packaging for international transportation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCourier options:\u003c\/strong\u003e FedEx, UPS, and DHL, subject to destination and service availability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDispatch target:\u003c\/strong\u003e Typically 24–48 hours after order confirmation for available stock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 12 months under the supplier's written warranty terms.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eConfirm stock status, shipping cost, packaging contents, and dispatch timing before payment. The stated warranty refers to the supplier's offered terms and does not automatically represent an original manufacturer warranty.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003e1. How can engineers determine whether a 1756-A4 chassis has sufficient backplane capacity?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eCalculate the current demand of every installed module at each applicable backplane voltage. Compare each total with the chassis and power supply limits. Check the official documentation for the exact hardware revision before approving the design.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e2. Can an engineer replace a 1756-A4 without changing the existing controller project?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eA chassis replacement does not normally change application logic by itself. However, engineers must verify the replacement hardware, module placement, power supply, and installed module compatibility. Follow the approved maintenance procedure and validate the system before returning it to service.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e3. What should buyers check when choosing between a four-slot and a larger ControlLogix chassis?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eCount the required modules and allow room for planned expansion. Then review power loading, cabinet space, wiring access, and supported hardware combinations. Choose a larger chassis when the current design cannot meet these requirements comfortably.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e4. When should engineers suspect a chassis or backplane problem rather than an individual module fault?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eInvestigate shared infrastructure when several modules show related faults at the same time. Check the power supply, backplane loading, module seating, and system status. Use approved diagnostic procedures before concluding that the chassis requires replacement.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e5. What information helps confirm the correct 1756-A4 replacement before purchase?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eProvide the chassis nameplate, hardware series, power supply model, installed module catalog numbers, and cabinet requirements. Include the intended application and any observed faults. These details help verify mechanical fit, electrical compatibility, and system integration requirements.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRequest a Quote | Allen-Bradley 1756-A4\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eNeed the \u003cstrong\u003e\u003cspan style=\"color: #c0392b;\"\u003e1756-A4 ControlLogix four-slot chassis\u003c\/span\u003e\u003c\/strong\u003e for system integration, maintenance, or replacement?\u003c\/p\u003e\n\n\u003cp\u003eContact Global PLC Spare HUB for a quotation, stock confirmation, compatibility review, and international shipping options. Send your required quantity and existing system details to help us identify the appropriate configuration.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":67651543859382,"sku":"1756-A4","price":109.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/1756-A4-1.jpg?v=1792122235","url":"https:\/\/www.plcsparehub.com\/products\/1756-a4-allen-bradley-controllogix-chassis-4-slot-backplane","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}