{"product_id":"yokogawa-nfa841-s00-a4s00-centum-cs-3000-analog-input-module","title":"Yokogawa NFA841-S00\/A4S00 CENTUM CS 3000 Analog Input Module","description":"\u003cp\u003eThe \u003cstrong\u003eYokogawa NFA841-S00\/A4S00\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eNFA841\u003c\/strong\u003e Analog Input Module, operates as a dedicated hardware component for 8-channel analog signal acquisition and digitization within Yokogawa CENTUM CS 3000 DCS platforms. It conditions incoming field process signals—including 4-20 mA DC, 1-5 V DC, thermocouple, and RTD inputs—for direct internal controller processing and backplane distribution.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eThe NFA841 model structure incorporates specific suffix coding to designate functional hardware variations and terminal connection options:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNFA841\u003c\/strong\u003e: Base Model Designation (8-channel analog input module architecture)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e-S\u003c\/strong\u003e: Standard Signal Type\/Execution Specification\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e00\u003c\/strong\u003e: Standard Hardware\/Functionality Option Code\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\/A4S00\u003c\/strong\u003e: Terminal Block Assembly Variant Code (Integrated pressure clamp\/screw terminal connection configuration)\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\u003eNFA841-S00\/A4S00\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\u003eStandard DCS Module Weight\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard CENTUM CS 3000 Slot Dimensions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to +60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eSystem Backplane Powered\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Channels\u003c\/td\u003e\n\u003ctd\u003e8 channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Input Types\u003c\/td\u003e\n\u003ctd\u003e4-20 mA DC, 1-5 V DC, Thermocouple, RTD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eA\/D Conversion Resolution\u003c\/td\u003e\n\u003ctd\u003e16-bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMeasurement Accuracy\u003c\/td\u003e\n\u003ctd\u003e+\/-0.1% of full scale\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Impedance (Power ON)\u003c\/td\u003e\n\u003ctd\u003e250 ohm (current), 1 Mohm (voltage)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Resistance (Power OFF)\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;=500 kohm (current), \u0026gt;=340 kohm (voltage)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Step Response Time\u003c\/td\u003e\n\u003ctd\u003e100 ms\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 \u0026amp; Channel Isolation Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe NFA841 module features 16-bit A\/D conversion stages tuned for precision process measurement, maintaining step response recovery times within 100 ms for analog inputs. Channel isolation barriers isolate the internal DCS backplane electronics from field-side electrical surges and ground loops. When configured for 4-20 mA loop processing, the module maintains an input impedance of 250 ohm during powered operation, transitioning to a high-impedance state (\u0026gt;=500 kohm) under unpowered conditions to preserve loop integrity across connected field devices.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What happens to the input loop impedance of the NFA841-S00\/A4S00 when main power is removed?\u003c\/p\u003e\n\u003cp\u003eA: Upon loss of power, the current input resistance increases from the nominal 250 ohm operational state to \u0026gt;=500 kohm, protecting connected field transmitter loops against ungrounded shorting risks.\u003c\/p\u003e\n\u003cp\u003eQ: What is the step response execution speed of the module when acquiring analog input transitions?\u003c\/p\u003e\n\u003cp\u003eA: The analog input stage processes full-scale step changes within 100 ms to provide rapid updates to the CENTUM CS 3000 controller backplane.\u003c\/p\u003e\n\u003cp\u003eQ: Does the NFA841-S00\/A4S00 support field temperature sensors directly?\u003c\/p\u003e\n\u003cp\u003eA: Yes, depending on hardware channel configuration, the module directly conditions input inputs from thermocouple and RTD sensors as well as standard 4-20 mA DC and 1-5 V DC signals.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eInsert the NFA841-S00\/A4S00 module vertically into the designated I\/O slot of the CENTUM CS 3000 node unit until the locking lever fully engages.\u003c\/li\u003e\n\u003cli\u003eSecure signal wiring to the terminal block assembly, ensuring terminal screws are torqued according to Yokogawa enclosure specifications.\u003c\/li\u003e\n\u003cli\u003eTerminate signal cable shields at a central grounding point to prevent circulating current loops across the analog signal channels.\u003c\/li\u003e\n\u003cli\u003eSeparate low-voltage analog signal lines (1-5 V DC, RTD, Thermocouple) from high-voltage AC power distribution conduits to reduce induced field noise.\u003c\/li\u003e\n\u003cli\u003eEnsure cabinet ventilation meets thermal clearance requirements to maintain ambient operating conditions within standard limits.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":52786770084120,"sku":"NFAI841-S00\/A4S00","price":170.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/3483\/3688\/files\/NFTI3S-001_Cocoai_8f4f397c-d9b0-4c5e-803c-9aa86671aa69.jpg?v=1790649497","url":"https:\/\/www.innoplcsync.com\/products\/yokogawa-nfa841-s00-a4s00-centum-cs-3000-analog-input-module","provider":"InnoPLC Sync Co., Ltd.","version":"1.0","type":"link"}