{"product_id":"allen-bradley-1747-dcm-data-highway-plus-communications-module","title":"Allen-Bradley 1747-DCM Data Highway Plus Communications Module","description":"\u003cdiv\u003e\u003cp\u003eThe Allen-Bradley 1747-DCM Direct Communication Module is a DH+ (Data Highway Plus) interface that enables data exchange between a supervisory AB controller and distributed SLC-500 controllers over the Data Highway Plus network via the RIO Link. This 1\/4‑rack module installs in an SLC 500 modular chassis and does not scan its own local I\/O; instead, it passes supervisory data between controllers, forming a distributed processing system. It supports Data Highway Plus speeds of 57.6, 115.2, or 230.4 kb\/s and provides dual DH+ data lines with a shield connection for robust, noise‑tolerant communication. By bridging DH+ networks to non‑DH+ AB controllers, the 1747-DCM enables data exchange and coordination across multiple controllers, facilitating remote I\/O and cross‑rack communication on existing DH+ installations. Typical applications include linking an SLC‑500 system to a PLC‑5 or to other SLC processors over DH+ to share discrete data, control status, and messages without duplicating I\/O in each rack.\u003c\/p\u003e\u003c\/div\u003e","brand":"Allen-Bradley","offers":[{"title":"New","offer_id":51658962075950,"sku":null,"price":1952.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_56c8784e-b16e-45a3-970f-4fca2501e75b.jpg?v=1769526029","url":"https:\/\/plgautomation.com\/products\/allen-bradley-1747-dcm-data-highway-plus-communications-module","provider":"PLG Automation ","version":"1.0","type":"link"}