{"product_id":"alr121-s00-yokogawa-alr121-rs-422-rs-485-communication-modules","title":"ALR121-S00 Yokogawa ALR121 RS-422\/RS-485 Communication Modules","description":"\u003ch2\u003eYOKOGAWA ALR121-S00 Serial Communication Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for Specific Technical Task in System\/Network Name, the \u003cstrong\u003eYOKOGAWA ALR121-S00\u003c\/strong\u003e (\u003cstrong\u003eALR121\u003c\/strong\u003e Serial Communication Module) provides direct physical\/electrical execution. This hardware component establishes point-to-point or multi-drop serial networks to link host CENTUM VP, CENTUM CS 3000, and ProSafe-RS control processors with external programmable logic controllers, sequencers, or FA-M3 subsystems. The module drives industrial data transactions through dual onboard RS-422A\/RS-485 interfaces, executing half-duplex start-stop synchronization routines to convert electrical bus signaling into structured software variables.\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-S00\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\u003e127 x 51 x 127 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 deg C to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e12.0 W max (Calculated at 24 VDC backplane level, 0.5 A current draw)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface Type\u003c\/td\u003e\n\u003ctd\u003eRS-422A \/ RS-485 (2 ports)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTopology\u003c\/td\u003e\n\u003ctd\u003ePoint-to-point or multi-drop networks\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\u003eMaximum Distance\u003c\/td\u003e\n\u003ctd\u003e1200 m per segment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhysical Connectors\u003c\/td\u003e\n\u003ctd\u003e2 x D-sub 9-pin female ports\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnvironmental Profile\u003c\/td\u003e\n\u003ctd\u003eISA Standard G3 corrosion protection resistance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProcess Control \u0026amp; DCS Instrumentation Attributes\u003c\/h3\u003e\n\u003cp\u003eThe internal communication processor of the ALR121-S00 regulates long-distance Modbus slave protocol execution across differential electrical fields. Designers embedded complete channel-to-channel isolation architecture within the module circuitry to restrict ground loop currents and external voltage imbalances from penetrating the centralized DCS backplane system. This physical layer separation maintains structural data integrity over the maximum 1200 m wire limits while operating in parallel with delicate analog field instrumentation. The hardware enforces a strict post-transmission lag time of exactly 1 ms, managing stable line turnaround periods during ASCII or binary multi-drop sequences without interrupting concurrent 4-20 mA HART loop protocol parameters or cold junction compensation processes active on host field control units.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What are the functional limitations when utilizing both communication ports on the ALR121-S00 concurrently?\u003c\/p\u003e\n\u003cp\u003eA: The firmware mandates that both D-sub 9-pin ports execute identical communication functions and baud configurations. The system does not support independent protocol mixing, such as running a Modbus slave link on one port and an asynchronous sequencer link on the other.\u003c\/p\u003e\n\u003cp\u003eQ: How do environmental conditions impact the physical field deployment parameters of this module?\u003c\/p\u003e\n\u003cp\u003eA: This specific suffix configuration contains an ISA Standard G3 conformal coating. The treatment blocks gaseous atmospheric contaminants from attacking the internal copper circuits, allowing deployment in aggressive process environments without premature thermal or electrical breakdown.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eEnsure the node slot power is completely de-energized prior to inserting the ALR121-S00 assembly into the AFV30, AFV40, A2FV50, A2FV70, ANB10, ANB11, or ANR10 base plates. Slide the hardware smoothly down the guide rails until the backplane contacts engage firmly, then verify the module lock clicks into position. Field technicians must complete multi-drop wiring using compliant AKB131, AKB132, AKB133, or AKB134 shielded cable series. Termination resistors must engage exclusively at the two physical ends of the differential network segments to minimize signal reflections. Route all data cables separate from high-amp AC motor lines or variable frequency drive loops to avoid corrupting half-duplex serial data packets.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":43767762583642,"sku":"ALR121-S00","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/686.jpg?v=1785460383","url":"https:\/\/www.spareoil.com\/es\/products\/alr121-s00-yokogawa-alr121-rs-422-rs-485-communication-modules","provider":"SpareOil Automation","version":"1.0","type":"link"}