{"product_id":"yokogawa-alr121-s51-serial-communication-module","title":"YOKOGAWA ALR121-S51 Serial Communication Module","description":"\u003cp\u003eThe \u003cstrong\u003eYOKOGAWA ALR121-S51\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eALR121\u003c\/strong\u003e Serial Communication Module, operates as a dedicated hardware component for executing half-duplex serial data transmission and field device interfacing within CENTUM VP \/ CS 3000 Field I\/O platforms. The hardware establishes connection methods via point-to-point RS-422 or multipoint RS-485 four-wire systems utilizing start-stop synchronization. Operating at transmission speeds ranging from 1200 bps to 38400 bps, the module processes physical signal conversions and routes electrical commands directly to the system backplane bus.\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\u003eALR121-S51\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\u003e0.34 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e107.5 x 130 x 32.8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e300 mA at 5 VDC \/ 20 mA at 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface Type\u003c\/td\u003e\n\u003ctd\u003eRS-422 \/ RS-485 (4-wire system)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Function\u003c\/td\u003e\n\u003ctd\u003eHalf-duplex\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSynchronization Method\u003c\/td\u003e\n\u003ctd\u003eStart-stop synchronization\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Speed\u003c\/td\u003e\n\u003ctd\u003e1200 \/ 2400 \/ 4800 \/ 9600 \/ 19200 \/ 38400 bps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Channels\u003c\/td\u003e\n\u003ctd\u003e16 isolated channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e1500 VAC for 1 minute (Channel to system)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrosion Protection\u003c\/td\u003e\n\u003ctd\u003eISA G3 conformal coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProcess Control and DCS Instrumentation Features\u003c\/h3\u003e\n\u003cp\u003eThe module integrates specialized channel-to-channel isolation parameters to mitigate ground loop noise across the distributed control network. This physical isolation baseline ensures that voltage spikes or signal degradation on one serial loop cannot propagate to adjacent processing channels or compromise backplane communications. Furthermore, the embedded circuitry is hardened against high electromagnetic interference (EMI) and radio frequency interference (RFI), maintaining synchronous data integrity under transient industrial noise profiles without requiring external isolation barriers.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the module support hot-swap replacement within an active FIO subsystem?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the hardware incorporates online hot-swap capabilities, allowing terminal removal and module extraction from the FIO baseplate without interrupting the power supply or communication loops of adjacent modules.\u003c\/p\u003e\n\u003cp\u003eQ: What are the continuous backplane current limitations for this unit?\u003c\/p\u003e\n\u003cp\u003eA: The device draws a maximum stable current of approximately 300 mA from the 5 VDC backplane logic rail and 20 mA from the 24 VDC field rail during peak active execution.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting and Orientation:\u003c\/strong\u003e Secure the module vertically onto the dedicated FIO baseplate slot. Ensure the dual-latch engagement mechanisms click completely into place to verify rigid electrical contact with the backplane connector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShielding and Grounding:\u003c\/strong\u003e Terminate all RS-422 and RS-485 serial communication cable shields at a single, dedicated instrumentation ground point. Do not create loops by grounding shield lines at both ends of the run.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring Separations:\u003c\/strong\u003e Route all low-voltage signal wiring through separate cable trays or conduits distinct from high-voltage AC power lines to minimize induced noise. Maintain a minimum separation distance of 300 mm from motor supply lines.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":43517509861466,"sku":"ALR121-S51","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/392._89b17131-8241-414e-8095-e587228dba9f.jpg?v=1781747250","url":"https:\/\/www.spareoil.com\/es\/products\/yokogawa-alr121-s51-serial-communication-module","provider":"SpareOil Automation","version":"1.0","type":"link"}