{"product_id":"alr121-s53-yokogawa-centum-vp-series-datasheet-technical-manual","title":"ALR121-S53 Yokogawa CENTUM VP Series Datasheet \u0026 Technical Manual","description":"\u003ch2\u003eYokogawa ALR121-S53 CENTUM VP Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eYokogawa ALR121-S53\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eALR121\u003c\/strong\u003e Serial Communication Module, operates as a dedicated hardware component for serial data transfer within \u003cstrong\u003eCENTUM VP \/ CS 3000\u003c\/strong\u003e networks.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase Model\u003c\/strong\u003e: ALR121 (Serial Communication Module, 2 ports, RS-422\/RS-485 physical layer layout)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuffix Type (-S)\u003c\/strong\u003e: Standard type execution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExplosion Protection (5)\u003c\/strong\u003e: With no explosion protection circuitry\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRevision Indicator (3)\u003c\/strong\u003e: Specific connector configuration and firmware execution layout\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-S53\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 ER bus slot dimension footprint\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to +70 deg C\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 at internal logic rails\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSerial Channels\u003c\/td\u003e\n\u003ctd\u003e2 independent hardware ports\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhysical Layer Interface\u003c\/td\u003e\n\u003ctd\u003eRS-422 \/ RS-485 (4-wire balancing structure)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNative Protocols\u003c\/td\u003e\n\u003ctd\u003eModbus slave communication function, subsystem link communication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStructural Shielding\u003c\/td\u003e\n\u003ctd\u003eIntegrated full EMI shield barrier (foil + braid alignment)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Barrier\u003c\/td\u003e\n\u003ctd\u003eGalvanic insulation between field wiring terminal blocks and system bus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-20 to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHumidity Resistance\u003c\/td\u003e\n\u003ctd\u003e10% to 90% RH, non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003e4-20 mA HART Loop Protocol and Subsystem Data Linking\u003c\/h3\u003e\n\u003cp\u003eThe ALR121-S53 manages high-density data synchronization pathways, acting as a critical interface that bridges external device networks to the primary DCS framework. This module works in conjunction with 4-20 mA HART loop protocol architectures by handling digital variable communication flags derived from remote instrument channels. The dual-port design uses independent physical lines to ensure channel-to-channel isolation parameters, which prevents field ground loops from causing error frames in process calculations. Cold junction compensation (CJC) algorithms handle software variables smoothly across the subsystem link, maintaining structural parity with Modbus slave configurations without reducing signal resolution.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the ALR121-S53 module execute hot-swap maneuvers on an active CENTUM node backplane?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the hardware allows live extraction and insertion within an energized I\/O slot. However, physical module swaps instantly terminate active Modbus slave communication loops on both ports, requiring manual data link state clear commands on the master controller to restore operation.\u003c\/p\u003e\n\u003cp\u003eQ: How does the internal controller handle the electrical separation of ports configured for RS-422 vs RS-485 operations?\u003c\/p\u003e\n\u003cp\u003eA: The mode transition is determined via internal register mapping. Each independent hardware port uses dedicated transceivers linked through galvanic insulation planes, guaranteeing that noise spikes on an RS-485 network line do not cross-talk into the adjacent serial data path.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModule Seating and Retention:\u003c\/strong\u003e Slide the card into the designated slot of the CENTUM card cage assembly until the front connector is completely locked. Tighten the integrated retaining screws to ensure solid electrical ground paths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShield Grounding Protocols:\u003c\/strong\u003e Terminate external serial network cables using full EMI shielding connections. The outer metallic braid must secure directly to the grounding bracket of the marshalling panel to ensure low-impedance transient current dissipation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring Layout Isolation Constraints:\u003c\/strong\u003e Route all RS-422\/RS-485 communication wires away from high-power AC mains, primary power lines, or inductive drive outputs by a minimum of 300 mm to suppress high-frequency induction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Resistance Assignment:\u003c\/strong\u003e For long-distance lines approaching maximum physical distances, install a matching external 120 Ohm carbon-film termination resistor across the RX\/TX differential pairs to prevent signal reflection errors.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":44230045433955,"sku":"ALR121-S53","price":360.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/5246\/8067\/files\/339._9986b386-aa24-416a-b840-1cb36475645a.jpg?v=1780300957","url":"https:\/\/www.autocontrolglobal.com\/products\/alr121-s53-yokogawa-centum-vp-series-datasheet-technical-manual","provider":"AutoControl Global","version":"1.0","type":"link"}