{"product_id":"allen-bradley-1756-dhrio-rio-communications-module","title":"Allen-Bradley 1756-DHRIO Rio Communications Module","description":"\u003cdiv\u003e\u003cp\u003eThe Allen‑Bradley 1756‑DHRIO is a two‑channel DH+ (Data Highway Plus) and Remote I\/O (RIO) communications module for ControlLogix backplanes. It bridges DH+ networks to a Rockwell Automation ControlLogix rack by providing two independently configurable channels (A and B) that carry DH+ traffic and function as a RIO scanner for Universal RIO networks, with three terminal blocks for wiring. This module enables DH+ messaging and RIO device access within a single chassis or across the DH+\/RIO network, making it a practical option for integrating legacy DH+ devices and Remote I\/O into modern ControlLogix systems. Configuration and topology are managed in Studio 5000\/Logix Designer, where you define channel mode, node addresses, and I\/O mapping. Common applications include bridging multiple DH+ devices to a single ControlLogix processor and enabling remote I\/O blocks to be scanned by the controller, supporting gradual migration from legacy DH+\/RIO architectures to contemporary ControlLogix setups. As of December 31, 2024, Rockwell Automation discontinued the 1756‑DHRIO; while new sales have ended, the module remains part of the historical ControlLogix ecosystem and may continue to operate in existing installations. \u003c\/p\u003e\u003c\/div\u003e","brand":"Allen-Bradley","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":51658913874222,"sku":null,"price":55.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_b1d233af-7ad2-4c3c-b796-9336efc8b187.jpg?v=1769525457","url":"https:\/\/plgautomation.com\/products\/allen-bradley-1756-dhrio-rio-communications-module","provider":"PLG Automation ","version":"1.0","type":"link"}