{"product_id":"alr121-s00-yokogawa-centum-vp-serial-communication-module","title":"ALR121-S00 | Yokogawa | CENTUM VP Serial Communication Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eYokogawa ALR121-S00\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efunctions as a high-speed serial gateway for the CENTUM VP and CS 3000 Distributed Control Systems. This module provides two independent ports supporting RS-422 and RS-485 protocols, enabling the Field Control Unit (FCU) to manage data from remote subsystems such as PLCs, variable frequency drives (VFDs), and multi-drop sensor networks. By incorporating ISA Standard G3 protection, the ALR121-S00 maintains operational integrity even in harsh industrial atmospheres. We supply this unit as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New and Original\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ein factory packaging.\u003c\/p\u003e\n\u003ch3\u003ePart Number Breakdown\u003c\/h3\u003e\n\u003cp\u003eThe ALR121-S00 suffix configuration defines its hardware capabilities and environmental resistance:\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eSuffix Code\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eFunctional Definition\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eALR121\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eSerial Communication Module (RS-422\/RS-485 Type)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e-S\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eStandard Type Hardware\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e0\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eNo explosion protection (Standard Area)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003e0\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWith ISA Standard G3\u003c\/strong\u003e conformal coating\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThe ALR121-S00 manages long-distance serial communication with high noise immunity.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCommunication Interface:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eRS-422\/RS-485 (2 ports).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eConnection Method:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eTerminal block or D-sub depending on the base unit.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTransmission Speed:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSupports high-speed data polling for real-time subsystem integration.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eEnvironmental Protection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eISA Standard G3 (Corrosion resistance for harsh gases).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRedundancy:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSupports dual-redundant module pairing.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSystem Interface:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePlugs directly into Yokogawa FCS\/FCU I\/O slots.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGuaranteed 100% Brand New Original.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cp\u003eThe ALR121-S00 addresses critical communication and environmental challenges in process plants:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCorrosive Atmosphere Survival:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIndustrial sites often harbor corrosive gases like Hydrogen Sulfide (H2S) and Sulfur Dioxide (SO2). The ALR121-S00 features ISA Standard G3 compliant conformal coating. This protective layer prevents circuit board corrosion, significantly extending the module’s lifespan in chemical and wastewater treatment facilities.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eLong-Distance Multi-Drop Connectivity:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUnlike RS-232, the RS-422\/RS-485 interface on the ALR121-S00 allows for cable runs up to 1,200 meters. This enables the DCS to control devices located far from the main control room without requiring expensive signal repeaters.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSuperior Noise Immunity:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe differential signaling of RS-485 inherently rejects electromagnetic interference (EMI). This allows the ALR121-S00 to maintain stable data flow even when installed near high-voltage motor starters or heavy-duty power cables.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eBumpless Redundancy:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWhen deployed in a duplexed configuration, the ALR121-S00 ensures continuous communication. If the active module detects a hardware failure, the standby unit assumes the serial stack instantly, preventing data loss or process upsets.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan the ALR121-S00 communicate with Modbus devices?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe ALR121-S00 provides the physical hardware layer for RS-485. You must configure the CENTUM software with the appropriate Modbus RTU\/ASCII communication drivers to interpret data from your slave devices.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIs the ISA Standard G3 coating necessary?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIf your facility handles chemicals or experiences high humidity, the G3 coating is vital. It prevents the \"silver whiskers\" and copper corrosion that typically lead to short circuits in standard industrial electronics.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHow many devices can I connect to a single port?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUnder the RS-485 standard, the ALR121-S00 can theoretically support up to 31 slave devices per port in a multi-drop configuration. However, we recommend calculating the total bus load and polling frequency to maintain optimal response times.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIs this a refurbished or original part?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWe sell only\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New and Original\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ehardware. Every ALR121-S00 ships in its original Yokogawa factory box with matching serial numbers for full traceability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":52824121803061,"sku":"ALR121-S00","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/ALR121-S00.png?v=1778037668","url":"https:\/\/www.5gplc.com\/products\/alr121-s00-yokogawa-centum-vp-serial-communication-module","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}