{"product_id":"yokogawa-alr121-s01-prosafe-rs-series-communication-modules","title":"Yokogawa ALR121-S01 ProSafe-RS Series Communication Modules","description":"\u003cp\u003eThe \u003cstrong\u003eYokogawa ALR121-S01\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eALR121\u003c\/strong\u003e Serial Communication Module, operates as a dedicated hardware component for half-duplex Modbus slave routing and subsystem data mapping within safety control station (SCS) platforms.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eThe ALR121 series utilizes explicit engineering suffixes to define hardware builds, communication interface variants, and hardware style revisions. Below is the technical breakdown for the \u003cstrong\u003eALR121-S01\u003c\/strong\u003e configuration:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eALR121\u003c\/strong\u003e: Core base model designator for the dual-port serial communication module.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e-S\u003c\/strong\u003e: Standard type construction baseline for standard industrial enclosure installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0\u003c\/strong\u003e: Phase indicator slot mapping designator.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\u003c\/strong\u003e: Style code indicating the physical hardware design revision or updated sub-component generation.\u003c\/li\u003e\n\u003c\/ul\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-S01\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\u003eApprox. 0.34 kg (0.75 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard Yokogawa ProSafe-RS I\/O slot size\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003eStandard industrial cabinet environmental parameters apply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eCurrent consumption of 0.5 A via node backplane rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eSerial Communication Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhysical Interface\u003c\/td\u003e\n\u003ctd\u003eRS-422 \/ RS-485 (4-wire system)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Wiring Connections\u003c\/td\u003e\n\u003ctd\u003eDual D-sub 9-pin female ports \/ M4 screw terminal block (5 poles x 2 ports)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Function\u003c\/td\u003e\n\u003ctd\u003eHalf-duplex tracking\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSynchronization Method\u003c\/td\u003e\n\u003ctd\u003eStart-stop synchronization (Asynchronous)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Speeds\u003c\/td\u003e\n\u003ctd\u003e1200 \/ 2400 \/ 4800 \/ 9600 \/ 19200 \/ 38400 bps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Coding\u003c\/td\u003e\n\u003ctd\u003eBinary transmission code\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharacter Architecture\u003c\/td\u003e\n\u003ctd\u003e8 bits character length (fixed for Modbus slave and subsystem functions)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStop Bit Alignment\u003c\/td\u003e\n\u003ctd\u003e1 or 2 bits (fixed to 1 bit for subsystem communication)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParity Configuration\u003c\/td\u003e\n\u003ctd\u003eNone \/ even \/ odd selectable options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTurnaround Lag Time\u003c\/td\u003e\n\u003ctd\u003e1 ms transmission delay parameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Cable Length\u003c\/td\u003e\n\u003ctd\u003e15 m (RS-422 point-to-point) \/ 1200 m (RS-485 multipoint)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTarget Chassis Mounting\u003c\/td\u003e\n\u003ctd\u003eCompatible with S2SC70S, SSC60S, SSC50S, SSC57S, and SNB10D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProcess Control System Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-20 mA HART Loop Protocol Network Arbitration\u003c\/strong\u003e While executing dedicated serial transactions over RS-422\/RS-485 physical lines, the module bridges isolated third-party master stations directly into the Safety Control Station (SCS) environment. This allows external networks to access or modify real-time registers without violating the execution timing of adjacent 4-20 mA safety instrumentation loops or safety-instrumented functions (SIF).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeterministic Processor Offloading and Channel Isolation\u003c\/strong\u003e The internal processor manages the Modbus slave protocol stack independently of the main safety processor. This architecture handles high-frequency asynchronous polling routines internally, suppressing line jitter and keeping transmission lag time fixed at 1 ms to prevent interference with deterministic safety logic tasks.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":47621296095422,"sku":"ALR121-S01","price":3000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/screenshot_2026-06-11_15-24-55_2c9a7f43-d562-4af3-b420-0015d782df25.png?v=1781164494","url":"https:\/\/www.autooiltech.com\/products\/yokogawa-alr121-s01-prosafe-rs-series-communication-modules","provider":"AutoOilTech Limited","version":"1.0","type":"link"}