{"product_id":"allen-bradley-1746-a4-slc-500-4-slot-rack-backplane","title":"Allen-Bradley 1746-A4 SLC-500 4-Slot Rack Backplane","description":"\u003cdiv\u003e\u003cp\u003eThe Allen‑Bradley 1746‑A4 SLC‑500 four‑slot rack backplane is a compact expansion chassis designed to host up to four 1746 I\/O modules in an SLC‑500 system. It provides the backplane interconnects that carry power, data, and ground between a central processor and each I\/O module, enabling a tidy, four‑slot configuration for small to mid‑scale control applications. The backplane’s physical footprint is approximately 171 mm (6.73 in) tall by 177 mm (6.97 in) wide by 145 mm (5.71 in) deep, and it weighs about 0.7 kg (1.6 lb), making it suitable for rear‑panel mounting inside standard control enclosures. For operation, a separate 120\/240 VAC power supply module is required to energize the installed I\/O modules; common compatible options come from the 1746‑P series power supplies used with SLC‑500 backplanes. As part of the SLC‑500 modular hardware family, the 1746‑A4 accepts standard 1746 I\/O modules in any of its four slots when paired with a compatible CPU, enabling straightforward discrete I\/O, timing, counting, and simple analog tasks. This backplane is intended to be used in a single rack with a processor and I\/O modules and is ideal for compact, stand‑alone control tasks or small machine automation panels that benefit from a four‑slot expansion footprint.\u003c\/p\u003e\u003c\/div\u003e","brand":"Allen-Bradley","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":51658987274542,"sku":null,"price":278.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_6ccc5750-d025-4a49-b449-1a7079fd8444.jpg?v=1769526322","url":"https:\/\/plgautomation.com\/products\/allen-bradley-1746-a4-slc-500-4-slot-rack-backplane","provider":"PLG Automation ","version":"1.0","type":"link"}