{"product_id":"yokogawa-alr121-s51-s1-rs-422-rs-485-serial-communication-module","title":"YOKOGAWA ALR121-S51 S1 RS-422 RS-485 SERIAL COMMUNICATION MODULE","description":"\u003ch3 data-section-id=\"1vt381m\" data-start=\"0\" data-end=\"22\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"4\" data-end=\"20\"\u003eDescription:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-start=\"23\" data-end=\"511\"\u003eThe Yokogawa ALR121-S51 S1 \u003ca href=\"https:\/\/plgautomation.com\/collections\/plcs-more\"\u003eSerial Communication Module\u003c\/a\u003e is used in distributed control systems for enabling RS-422\/RS-485 communication between controllers and external devices. Commonly installed in Yokogawa CENTUM DCS field control units and node units for subsystem communication. Maintenance teams and system integrators use this part for establishing serial communication, replacing failed communication modules, or maintaining reliable data exchange in process control systems.\u003c\/p\u003e\n\u003ch3 data-section-id=\"10m4hth\" data-start=\"513\" data-end=\"536\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"517\" data-end=\"534\"\u003eApplications:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-start=\"537\" data-end=\"1086\"\u003eThe Yokogawa ALR121-S51 is commonly used in industrial automation environments where serial communication is required between DCS systems and external subsystems such as PLCs, analyzers, and third-party equipment. It is frequently applied in oil \u0026amp; gas, chemical plants, power generation, and manufacturing systems to enable Modbus communication and subsystem integration. The module supports both point-to-point and multipoint communication, allowing flexible connection architectures for industrial networks. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"12f0hz5\" data-start=\"1088\" data-end=\"1123\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"1092\" data-end=\"1121\"\u003eTechnical Specifications:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1124\" data-end=\"2172\"\u003e• Manufacturer: Yokogawa\u003cbr data-start=\"1148\" data-end=\"1151\"\u003e• Model \/ Part Number: ALR121-S51 S1\u003cbr data-start=\"1187\" data-end=\"1190\"\u003e• Product Type: Serial Communication Module\u003cbr data-start=\"1233\" data-end=\"1236\"\u003e• Interface: RS-422 \/ RS-485 (4-wire system) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"1318\" data-end=\"1321\"\u003e• Communication Type: Half-duplex \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"1392\" data-end=\"1395\"\u003e• Connection Methods:\u003cbr data-start=\"1416\" data-end=\"1419\"\u003e  – Point-to-point (RS-422)\u003cbr data-start=\"1446\" data-end=\"1449\"\u003e  – Multipoint (RS-485) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"1510\" data-end=\"1513\"\u003e• Synchronization Method: Start-stop synchronization \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"1603\" data-end=\"1606\"\u003e• Transmission Speed: 1200 \/ 2400 \/ 4800 \/ 9600 \/ 19200 \/ 38400 bps \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"1711\" data-end=\"1714\"\u003e• Communication Functions: Modbus slave communication, subsystem communication \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"1830\" data-end=\"1833\"\u003e• Transmission Distance: Up to ~1200 m (RS-422\/485 typical) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"1930\" data-end=\"1933\"\u003e• Mounting Compatibility: AFV, ANB, ANR series node\/FCU units \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"2032\" data-end=\"2035\"\u003e• Current Consumption: Approx. 0.5 A \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"2109\" data-end=\"2112\"\u003e• Function: Data exchange between DCS and external systems\u003c\/p\u003e\n\u003ch3 data-section-id=\"uqv3ss\" data-start=\"2174\" data-end=\"2204\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"2178\" data-end=\"2202\"\u003eCommon Replacements:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2205\" data-end=\"2354\"\u003e• Yokogawa ALR121-S50 Serial Communication Module\u003cbr data-start=\"2254\" data-end=\"2257\"\u003e• Yokogawa ALR111 Serial Communication Module\u003cbr data-start=\"2302\" data-end=\"2305\"\u003e• Yokogawa ALP111 PROFIBUS Communication Module\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"New","offer_id":51734674637102,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_cce94803-c4b5-49b7-87f8-6226391f42e7.jpg?v=1770606890","url":"https:\/\/plgautomation.com\/products\/yokogawa-alr121-s51-s1-rs-422-rs-485-serial-communication-module","provider":"PLG Automation ","version":"1.0","type":"link"}