{"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 dedicated communication bridge module designed for the ControlLogix platform, providing a reliable gateway between modern control systems and legacy DH-485 networks. This module is an essential tool for system integrators tasked with migrating existing SLC 500, MicroLogix, or legacy PanelView architectures into a high-performance ControlLogix environment without requiring a complete overhaul of field wiring.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-Channel Interface:\u003c\/strong\u003e Features two independent DB9 serial ports (Channel A and Channel B) for versatile network connectivity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtocol Gateway:\u003c\/strong\u003e Facilitates seamless data exchange between ControlLogix processors and devices communicating via the DH-485 protocol.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScalable Node Support:\u003c\/strong\u003e Supports up to 32 logical nodes per channel, allowing for robust expansion of legacy network segments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical Isolation:\u003c\/strong\u003e Integrated galvanic isolation between the DB9 ports and the backplane protects sensitive controller components from electrical surges and ground loop interference.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact Footprint:\u003c\/strong\u003e Occupies a single slot in any standard 1756 ControlLogix chassis.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable border=\"1\"\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\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\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\u003eCommunication Ports\u003c\/td\u003e\n\u003ctd\u003e2 x DB9 (Channel A\/B)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Baud 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\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 60 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelative Humidity\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 to prevent damage to the backplane or module circuitry.\u003c\/li\u003e\n\u003cli\u003eSlide the module into any available slot in the 1756 chassis and secure the top and bottom latching mechanisms.\u003c\/li\u003e\n\u003cli\u003eUse shielded communication cables for all RS-485 connections to minimize electromagnetic interference (EMI).\u003c\/li\u003e\n\u003cli\u003eMaintain proper ventilation in the control cabinet to ensure ambient temperatures remain within the 0 to 60 degC operating range.\u003c\/li\u003e\n\u003cli\u003eFollow standard ESD (electrostatic discharge) prevention practices when handling the module to protect internal logic components.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eCan this module be used to bridge two different DH-485 networks?\u003c\/strong\u003e\u003cbr\u003eYes, the dual-channel configuration allows for independent network management, enabling the module to act as a bridge or gateway for multiple network segments.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this module require external power?\u003c\/strong\u003e\u003cbr\u003eNo, the 1756-DH485 draws all necessary operating power directly from the ControlLogix chassis backplane.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43996068872282,"sku":"1756-DH485","price":93.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/wm_1_c8e8451e-2246-4ac9-9eed-15a09b66e71e.jpg?v=1788306211","url":"https:\/\/www.spareoil.com\/es\/products\/allen-bradley-1756-dh485-controllogix-dh-485-module","provider":"SpareOil Automation","version":"1.0","type":"link"}