{"product_id":"yokogawa-alr121-s00-s1-prosafe-rs-communication-module","title":"Yokogawa ALR121-S00 S1 ProSafe-RS Communication Module","description":"\u003cp\u003eThe \u003cstrong\u003eYokogawa ALR121-S00 S1\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eALR121-S00\u003c\/strong\u003e Communication Module, is configured for interference-free serial communication within safety-instrumented platforms, providing direct physical\/electrical execution.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eALR121\u003c\/strong\u003e: Base model designating the dual-port serial communication module supporting RS-422 and RS-485 interfaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e-S00\u003c\/strong\u003e: Standard suffix configuration specifying base hardware execution without hazardous location special coatings or extended temperature tier variations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS1\u003c\/strong\u003e: Style code designation representing the hardware manufacturing revision level for system bus compatibility.\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-S00 S1\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard Yokogawa module 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\u003e0.5 A\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\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\u003eD-sub 9-pin and M4 screw terminal block\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-S00 S1 module incorporates galvanic isolation to ensure its serial communication loops remain entirely interference-free relative to critical safety loops. Operating via half-duplex transmission protocols with start-stop synchronization, the module handles binary data framing with configurable parity and fixed 8-bit character lengths. Signal paths are engineered to prevent common-mode voltage propagation and ground loops across connected RS-422 point-to-point links and RS-485 multipoint networks.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the installation of the ALR121-S00 S1 module impact the integrity of active safety loops?\u003c\/p\u003e\n\u003cp\u003eA: No. The module is structurally classified as an interference-free component designed with galvanic separation to ensure that subsystem and Modbus data traffic induces no interference with the core safety loop execution.\u003c\/p\u003e\n\u003cp\u003eQ: What are the fixed character and stop bit parameters when utilizing Modbus slave functions?\u003c\/p\u003e\n\u003cp\u003eA: Character length is fixed at 8 bits, and the stop bit length is governed by the selected configuration, with subsystem communication enforcing a strict 1-bit stop bit length.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eEnsure slot power is isolated on the parent node before inserting or extracting the ALR121-S00 S1 module.\u003c\/li\u003e\n\u003cli\u003eTerminate incoming RS-485 or RS-422 signal lines securely using either the D-sub 9-pin connectors or the M4 clamping terminal screws.\u003c\/li\u003e\n\u003cli\u003eConnect cable shield drains to the designated panel ground bar to maintain electromagnetic compatibility.\u003c\/li\u003e\n\u003cli\u003eVerify that line termination resistors are correctly matched to the characteristic impedance of the field communication cable run.\u003c\/li\u003e\n\u003cli\u003eRoute low-voltage serial communication wiring through segregated cable trays away from high-power alternating current distribution lines.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":52637751771416,"sku":"ALR121-S00 S1","price":190.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/3483\/3688\/files\/1769-IA8I_Cocoai_be6bd241-24e6-4773-86e9-85e3796f6573.jpg?v=1788919958","url":"https:\/\/www.innoplcsync.com\/products\/yokogawa-alr121-s00-s1-prosafe-rs-communication-module","provider":"InnoPLC Sync Co., Ltd.","version":"1.0","type":"link"}