{"product_id":"allen-bradley-1746-a4-slc-500-4-slot-modular-backplane-chassis","title":"Allen Bradley 1746-A4 SLC 500 4-Slot Modular Backplane Chassis","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe Allen Bradley 1746-A4 functions as a rugged, 4-slot modular chassis for the legacy SLC 500 controller platform. This backplane assembly serves as the physical foundation and electrical backbone for a complete automation assembly, securely housing the primary SLC 5\/0x processor, the system power supply, and standard digital, analog, or specialty I\/O modules. It distributes local operational power and coordinates data signaling across the internal bus. We guarantee this unit arrives in 100% brand new, original factory-sealed condition.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAllen Bradley \/ Rockwell Automation\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eProduct Line\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eSLC 500 Series\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1746-A4\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eUPC\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e662468415354\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePLC Modular Chassis Rack\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSlot Count\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4 Slots (Processor\/Power Supply + 3 Available I\/O Slots)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackplane Voltage Rails\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e5.1 V DC and 24 V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSystem Role\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eI\/O and Processor Housing\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMounting Method\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePanel Mounted (Via integrated mounting tabs)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eGrounding Method\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eDirect Panel Ground\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInterconnect Support\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1746 Chassis Cables\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eExpansion Capability\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eMulti-chassis linking (Up to 3 chassis total)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1.31 lbs (0.60 kg)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Speed Bus Signal Integrity:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe heavy-duty 1746 backplane traces deliver clean 5.1V DC and 24V DC power rails across all slots while maintaining stable cross-talk isolation. This high level of shielding prevents high-frequency data corruption when routing complex analog or communication signals adjacent to high-draw digital switching cards.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCompact Footprint for Small Enclosures:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 4-slot frame configuration optimizes tight panel space. This compact size allows engineering teams to install dedicated remote I\/O drops, localized pump control panels, or small skid systems without dedicating excess enclosure real estate to unused chassis slots.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRigid Multi-Chassis Expansion Path:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe integrated side connection port supports standard 1746 chassis expansion cables. This port allows engineers to link up to 3 individual racks together horizontally or vertically, scaling the local I\/O capacity up to meet growing machine requirements without swapping out the primary CPU.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDirect Panel-Ground Structural Stability:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe chassis framework features robust, integrated panel-mounting tabs that anchor the assembly directly to the metal enclosure backplate. This mechanical layout ensures an immediate, low-impedance grounding path, which significantly dampens the effects of industrial cabinet vibration and nearby electromagnetic noise.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this 1746-A4 chassis arrive in original Allen Bradley packaging?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. We ship this chassis rack as a 100% brand new, authentic factory item inside its original Rockwell Automation box. It includes the original cardboard supports, anti-static plastic barrier, and factory instruction sheets intact.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the 4-slot count include the space for the power supply module?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The dedicated power supply slot sits on the far left side of the chassis frame and utilizes its own mounting footprint. The 4 slots refer specifically to the standard module openings available to hold the CPU (Slot 0) and your chosen combination of I\/O or communication modules.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHow many expansion racks can I chain to this primary 1746-A4 assembly?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 1746 backplane architecture allows you to link a maximum of 3 chassis together into a single local system. You must utilize official 1746-C7, 1746-C9, or 1746-C11 interconnect cables to run the backplane communications safely between the separate racks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the installation grounding requirements for this chassis?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYou must clear all non-conductive paint or coatings away from the enclosure backplate at the screw contact points. Fasten the 1746-A4 securely using star washers to ensure a solid, direct metal-to-metal panel ground connection for effective electrical noise dissipation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":53493613068472,"sku":"1746-A4","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/1746-A4.jpg?v=1779421230","url":"https:\/\/www.globalpetroparts.com\/products\/allen-bradley-1746-a4-slc-500-4-slot-modular-backplane-chassis","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}