{"product_id":"allen-bradley-1756-dh485-controllogix-dh-485-module","title":"Allen-Bradley 1756-DH485 ControlLogix DH-485 Communication Bridge Module","description":"\u003cp\u003eThe Allen-Bradley 1756-DH485 is a specialized communication interface bridge module designed for the ControlLogix automation platform. This single-slot module functions as a protocol gateway, enabling ControlLogix processors to interface directly with legacy DH-485 (Data Highway 485) networks. It is an essential component for system migrations, allowing for the integration of legacy SLC 500, MicroLogix, or PanelView hardware into high-performance ControlLogix systems without requiring complete field rewiring.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-Channel Connectivity:\u003c\/strong\u003e Features two independent DB9 communication ports (Channel A and Channel B), allowing for flexible network configuration as either an initiator or a responding node.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNetwork Capacity:\u003c\/strong\u003e Supports up to 32 logical devices per network segment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGalvanic Isolation:\u003c\/strong\u003e Integrated electrical isolation barriers protect internal backplane logic from ground-loop fluctuations and field surges.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtocol Support:\u003c\/strong\u003e Utilizes standard token-passing protocol layers over RS-485 physical media.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplications\u003c\/h3\u003e\u003cp\u003eThis module is primarily used in industrial environments for phased equipment retrofits and system upgrades. It allows facilities to maintain communication with legacy DH-485 devices while transitioning to modern ControlLogix control architectures, effectively reducing implementation costs and minimizing system downtime.\u003c\/p\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1756-DH485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Line\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\u003eDH-485 Communication Bridge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePorts\u003c\/td\u003e\n\u003ctd\u003e2x DB9 D-shell (Channel A\/B)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBaud Rates\u003c\/td\u003e\n\u003ctd\u003e9.6 kbps, 19.2 kbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current (5.1V)\u003c\/td\u003e\n\u003ctd\u003e850 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current (24V)\u003c\/td\u003e\n\u003ctd\u003e1.7 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Dissipation\u003c\/td\u003e\n\u003ctd\u003e4.5 Watts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e30V continuous\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHumidity\u003c\/td\u003e\n\u003ctd\u003e5 to 95 percent non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEnsure the ControlLogix chassis is powered down before inserting or removing the module.\u003c\/li\u003e\n\u003cli\u003eThe module occupies a single slot in any standard 1756 ControlLogix chassis.\u003c\/li\u003e\n\u003cli\u003eUse shielded communication cables for RS-485 connections to minimize EMI interference.\u003c\/li\u003e\n\u003cli\u003eEnsure proper grounding of the chassis to a common earth ground to maintain signal integrity.\u003c\/li\u003e\n\u003cli\u003eHandle the module using ESD-safe practices to prevent damage to sensitive electronic components.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch3\u003eCan this module be used in any ControlLogix chassis?\u003c\/h3\u003e\u003cp\u003eYes, the 1756-DH485 is compatible with standard 1756 chassis series, including 1756-A4, 1756-A7, 1756-A10, 1756-A13, and 1756-A17.\u003c\/p\u003e\u003ch3\u003eDoes the module require external power?\u003c\/h3\u003e\u003cp\u003eNo, the module is powered directly through the ControlLogix backplane; it does not require an external power supply for its own operation.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":50986400055548,"sku":"1756-DH485","price":93.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/wm_1_407c29c9-575b-49fb-9b3d-aee8691c76b0.jpg?v=1786820365","url":"https:\/\/www.electronicplc.com\/ar\/products\/allen-bradley-1756-dh485-controllogix-dh-485-module","provider":"Electronic PLC","version":"1.0","type":"link"}