{"product_id":"yokogawa-alr121-s01-serial-communication-module","title":"Yokogawa ALR121-S01 Serial Communication Module","description":"\u003cp\u003eConfigured for serial data exchange in ProSafe-RS control platforms, the \u003cstrong\u003eYokogawa ALR121-S01\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eALR121-S01\u003c\/strong\u003e Serial Communication Module, provides direct physical\/electrical execution.\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-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\u003e0.34 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard Yokogawa slot width\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\u003e0.5 A (current consumption)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface\u003c\/td\u003e\n\u003ctd\u003eRS-422, RS-485 (4-wire system)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Transmission Distance\u003c\/td\u003e\n\u003ctd\u003e15 m (RS-422), 1200 m (RS-485)\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\u003eConnection Type\u003c\/td\u003e\n\u003ctd\u003e2x D-sub 9-pin female or 2x M4 screw terminal block (5 poles)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Compatibility\u003c\/td\u003e\n\u003ctd\u003eS2SC70S, SSC60S, SSC50S, SSC57S, SNB10D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eChannel-to-Channel Isolation and Serial Protocols\u003c\/h3\u003e\n\u003cp\u003eThe Yokogawa ALR121-S01 module incorporates half-duplex RS-422 and RS-485 serial interfaces designed for Modbus slave and subsystem communication. Integrated isolation circuitry mitigates ground potential differentials and common-mode transients between the Safety Control Station (SCS) sub-rack and external Modbus master devices. Supporting start-stop synchronization and configurable parity control, the module maintains signal stability across transmission distances up to 1200 m on RS-485 networks in high-density process automation environments.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What are the wiring connection limits when using the ALR121-S01 RS-485 interface?\u003c\/p\u003e\n\u003cp\u003eA: The RS-485 multipoint connection supports a maximum cabling distance of 1200 m using standard 4-wire shielded twisted-pair cabling with appropriate terminal line termination resistor matching.\u003c\/p\u003e\n\u003cp\u003eQ: Can the ALR121-S01 be installed into a live safety control unit baseboard?\u003c\/p\u003e\n\u003cp\u003eA: Module insertion or removal must comply with Yokogawa ProSafe-RS rack power down requirements or designated hot-swap procedures to prevent bus logic interruptions and field transceiver damage.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eIsolate main sub-rack power prior to placing the ALR121-S01 into base units such as S2SC70S or SSC60S.\u003c\/li\u003e\n\u003cli\u003eTerminate signal lines at M4 screw terminal blocks with a recommended torque of 1.2 N m or secure D-sub 9-pin connectors via locking screws.\u003c\/li\u003e\n\u003cli\u003eApply standard 120 ohm line termination resistors at both physical endpoints of the RS-485 4-wire serial segment.\u003c\/li\u003e\n\u003cli\u003eConnect cable shield drains to the local safety chassis ground bar at a single point to avoid earth loop current coupling.\u003c\/li\u003e\n\u003cli\u003eMaintain dedicated wire routing channels to segregate low-voltage RS-422\/RS-485 serial lines from AC power and high-current relay cabling.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":52637746364696,"sku":"ALR121-S01","price":190.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/3483\/3688\/files\/NFAF135-S50_3_d9962b02-edd6-4132-b969-df8aa7e7c808.jpg?v=1788919940","url":"https:\/\/www.innoplcsync.com\/products\/yokogawa-alr121-s01-serial-communication-module","provider":"InnoPLC Sync Co., Ltd.","version":"1.0","type":"link"}