{"product_id":"lc81-b-yokogawa-centum-fcu-rl-bus-communication-module","title":"LC81*B YOKOGAWA CENTUM FCU RL-BUS Communication Module","description":"\u003ch2\u003eYOKOGAWA LC81*B Communication Modules\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eYOKOGAWA LC81*B\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eLC81\u003c\/strong\u003e Communication Modules, operates as a dedicated hardware component for high-speed deterministic bus data exchange within Field Control Unit (FCU) architectures. It handles physical layer frame processing and control signaling over the proprietary RL-BUS network to maintain continuous telemetry between central processing units and field-level subnodes.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eLC81*B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eYOKOGAWA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.4 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard CENTUM CS \/ CENTUM VP card form factor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e3 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Interface\u003c\/td\u003e\n\u003ctd\u003eRL-BUS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Compatibility\u003c\/td\u003e\n\u003ctd\u003eField Control Unit (FCU), CENTUM DCS Platforms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003e4-20 mA HART Loop Protocol \u0026amp; Fieldbus Connectivity\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eYOKOGAWA LC81*B\u003c\/strong\u003e interface card processes digital communication frames across the system backplane to integrate subsystem field telemetry with higher-level DCS controllers. While handling high-speed packet transfer on the primary RL-BUS line, the module supports downstream digital fieldbus pass-through and 4-20 mA HART loop protocol routing. Furthermore, internal signal conditioning circuitry suppresses common-mode electromagnetic noise, preventing field-line harmonic interference from degrading high-speed control loops or corrupting process variable telemetry.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What precautions are necessary regarding power distribution when installing the LC81*B card into a backplane slot?\u003c\/p\u003e\n\u003cp\u003eA: Installers must power down the target rack segment or strictly follow Yokogawa hot-swap protocols to prevent voltage transients on the shared system bus. In addition, verify that the 3 W power draw does not exceed the remaining backplane power supply budget.\u003c\/p\u003e\n\u003cp\u003eQ: How does the module handle high-frequency communication noise on the RL-BUS physical interface?\u003c\/p\u003e\n\u003cp\u003eA: Integrated transformer coupling and isolated bus transceiver circuitry attenuate high-frequency noise and ground loops across the communication lines.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eMount the \u003cstrong\u003eYOKOGAWA LC81*B\u003c\/strong\u003e card directly into the designated FCU card slot, ensuring the rear connector seats firmly into the backplane. Route all external RL-BUS communication cabling through shielded twisted-pair (STP) lines kept physically separated from high-voltage AC power conductors. Terminate the cable shield at a single-point instrument ground (IG) terminal to prevent ground loop current flow. Finally, torque all terminal retaining screws to manufacturer specifications before energizing the control rack.\u003c\/p\u003e","brand":"YOKOGAWA","offers":[{"title":"Default Title","offer_id":51179260510520,"sku":"LC81*B","price":265.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0893\/1616\/3896\/files\/LC81B.jpg?v=1759128953","url":"https:\/\/www.automodulexpert.com\/products\/lc81-b-yokogawa-centum-fcu-rl-bus-communication-module","provider":"AutoModuleXpert Ltd.","version":"1.0","type":"link"}