{"product_id":"yokogawa-alr121-s50s1-communication-module-centum-vp","title":"Yokogawa ALR121-S50S1 Communication Module CENTUM VP","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eALR121-S50S1\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a high-performance serial communication module developed for the Yokogawa CENTUM VP Distributed Control System (DCS). It enables seamless integration of third-party subsystems—such as PLCs, motor control centers (MCCs), protection relays, and analyzers—into the unified CENTUM control environment.\u003c\/p\u003e\n\u003cp\u003eSupporting both RS-422 and RS-485 physical layers, the ALR121-S50S1 accommodates complex multi-drop network topologies and long-distance communication links. By offloading serial communication processing from the main Field Control Unit (FCU), it ensures that time-critical control loops remain unaffected by heavy data traffic.\u003c\/p\u003e\n\u003cp\u003eThe module supports Modbus RTU and other serial communication protocols, enabling bidirectional data exchange for real-time monitoring, alarm reporting, and remote setpoint control. It is widely used as a communication gateway for consolidating distributed field data into centralized Yokogawa HMI and supervisory systems.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface Standard\u003c\/td\u003e\n\u003ctd\u003eDual-port RS-422 or RS-485 (software selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtocol Support\u003c\/td\u003e\n\u003ctd\u003eModbus RTU, PC Link, general-purpose serial communication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003eChannel-to-system isolation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Baud Rate\u003c\/td\u003e\n\u003ctd\u003eUp to 115.2 kbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Distance\u003c\/td\u003e\n\u003ctd\u003eUp to 1200 m (RS-485 differential signaling)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSlot Occupancy\u003c\/td\u003e\n\u003ctd\u003eSingle slot on standard I\/O node base\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e5 V DC internal logic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 55°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (W × H × D)\u003c\/td\u003e\n\u003ctd\u003e22 mm × 124 mm × 126 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e1.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch3\u003eApplication\u003c\/h3\u003e\n\u003cp\u003eThe ALR121-S50S1 is commonly deployed in:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eOil \u0026amp; gas production facilities (flow computers, RTUs)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePower generation plants (protection relays, turbine controllers)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eChemical and petrochemical installations\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIntegrated plant-wide automation requiring third-party device connectivity\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIt is particularly suited for applications where disparate field devices must be integrated into a centralized Yokogawa DCS architecture for monitoring and supervisory control.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eTechnical FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the ALR121-S50S1 support dual-redundant configurations?\u003c\/strong\u003e\u003cbr\u003eYes. In high-availability systems, two modules can be configured redundantly. If the primary communication path fails, the standby module takes over to maintain continuous data exchange.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow are termination resistors handled for RS-485 networks?\u003c\/strong\u003e\u003cbr\u003eThe module includes configurable internal termination settings. These can be enabled via hardware switches or software parameters to ensure signal stability and prevent reflections on long cable runs.\u003c\/p\u003e","brand":"YOKOGAWA","offers":[{"title":"Default Title","offer_id":51849262039352,"sku":"ALR121-S50S1","price":188.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0893\/1616\/3896\/files\/ALR121-S50S11.jpg?v=1772502775","url":"https:\/\/www.automodulexpert.com\/products\/yokogawa-alr121-s50s1-communication-module-centum-vp","provider":"AutoModuleXpert Ltd.","version":"1.0","type":"link"}