{"product_id":"yokogawa-nfai841-s00-analog-i-o-module","title":"Yokogawa NFAI841-S00 Analog I\/O Module","description":"\u003ch2\u003eYokogawa NFAI841-S00 Analog I\/O Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for direct electrical execution of 4-20 mA signal acquisition and analog current output handling in CENTUM VP and CENTUM CS 3000 FIO environments, the \u003cstrong\u003eYokogawa NFAI841-S00\u003c\/strong\u003e (\u003cstrong\u003eNFAI841-S00\u003c\/strong\u003e Analog I\/O Module) provides discrete channel-level analog interfacing without external signal conditioning stages.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNFAI841\u003c\/strong\u003e: Analog Input\/Output mixed I\/O module family within Yokogawa FIO system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS\u003c\/strong\u003e: Standard configuration variant\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0\u003c\/strong\u003e: Fixed hardware revision identifier\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0\u003c\/strong\u003e: Basic type designation without extended options\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\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModelBrand\u003c\/td\u003e\n\u003ctd\u003eYokogawa NFAI841-S00\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. 0.43 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperatingTemp\u003c\/td\u003e\n\u003ctd\u003e0 degC to 60 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePowerConsumption\u003c\/td\u003e\n\u003ctd\u003e5 VDC, max 410 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Signal\u003c\/td\u003e\n\u003ctd\u003e4-20 mA DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Signal\u003c\/td\u003e\n\u003ctd\u003e4-20 mA DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannels\u003c\/td\u003e\n\u003ctd\u003e4 input + 4 output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Impedance\u003c\/td\u003e\n\u003ctd\u003e250 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoad Resistance (Output)\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;= 750 ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003eInput +\/-0.1% FS, Output +\/-0.3% FS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003eChannel-to-channel and system isolation (photo-coupled)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWithstanding Voltage\u003c\/td\u003e\n\u003ctd\u003e1500 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRefresh Cycle\u003c\/td\u003e\n\u003ctd\u003e10 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eYokogawa DCS Analog Loop Isolation \u0026amp; HART Signal Handling\u003c\/h3\u003e\n\u003cp\u003eThe NFAI841-S00 implements channel-to-channel electrical isolation using photo-coupled barriers to prevent ground loop propagation across mixed analog I\/O paths. Each 4-20 mA loop is independently referenced, allowing simultaneous current sourcing and sinking operations within a single module slot without cross-channel interference.\u003c\/p\u003e\n\u003cp\u003eHART-compatible field devices can be interfaced over the same 4-20 mA loop, enabling bidirectional digital overlay communication for device diagnostics and parameter access. Signal integrity is maintained through loop impedance control centered around 250 ohm input loading, ensuring stable modulation detection for HART FSK signaling under standard DCS scan cycles.\u003c\/p\u003e\n\u003cp\u003eBackplane execution is synchronized with a 10 ms refresh cycle, decoupling field signal sampling from controller scan timing.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can input and output channels operate simultaneously in NFAI841-S00?\u003c\/strong\u003e\u003cbr\u003eA: Yes. Input and output sections are electrically independent with internal isolation, allowing concurrent 4-20 mA sourcing and measurement within the same module.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the module support hot-swap replacement?\u003c\/strong\u003e\u003cbr\u003eA: Replacement is supported at system level depending on CENTUM node configuration; field loops must be de-energized or placed in safe state before module extraction to avoid transient current spikes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the impact of backplane current consumption on slot density?\u003c\/strong\u003e\u003cbr\u003eA: Each module draws up to 410 mA at 5 VDC. Slot loading must remain within node power budget to maintain stable backplane voltage regulation.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMaintain shield continuity across analog loop cabling; terminate shield at single-point ground within control cabinet only\u003c\/li\u003e\n\u003cli\u003eKeep 4-20 mA loop wiring physically separated from high-voltage switching conductors to minimize inductive coupling\u003c\/li\u003e\n\u003cli\u003eEnsure correct polarity alignment for both input transmitter loops and output actuator loops before energization\u003c\/li\u003e\n\u003cli\u003eVerify module seating force and backplane connector engagement prior to system power application\u003c\/li\u003e\n\u003cli\u003eAvoid exceeding 750 ohm total loop resistance on output channels to prevent current saturation or clipping\u003c\/li\u003e\n\u003cli\u003eUse twisted-pair instrumentation cable for all analog channels to maintain signal integrity over extended runs\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":44214239461464,"sku":"NFAI841-S00","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/2039\/0488\/files\/NFAI841-S00-3.jpg?v=1781059147","url":"https:\/\/www.industriaxplc.com\/products\/yokogawa-nfai841-s00-analog-i-o-module","provider":"IndustriaX Limited","version":"1.0","type":"link"}