{"product_id":"nfai841-s50-analog-input-module-yokogawa","title":"NFAI841-S50 Analog Input Module | Yokogawa","description":"\u003ch2\u003eYokogawa NFAI841-S50 Analog Input Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for acquisition of 4 to 20 mA DC field loop signals in FOUNDATION Fieldbus based control architectures, the \u003cstrong\u003eYokogawa NFAI841-S50\u003c\/strong\u003e (\u003cstrong\u003eNFAI841\u003c\/strong\u003e Analog Input Module) provides direct electrical conversion of analog current inputs into system-level process data for FIO backplane integration within Yokogawa distributed control systems.\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: Base module type, analog input processing unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS50\u003c\/strong\u003e: Configuration\/assembly variant (terminal and mounting specification dependent on system integration)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNo additional functional decomposition is defined for suffix \u003cstrong\u003eS50\u003c\/strong\u003e based on provided manufacturing data.\u003c\/p\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\u003eModel\u003c\/td\u003e\n\u003ctd\u003eNFAI841-S50\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\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eAnalog Input Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eFOUNDATION Fieldbus (FF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannels\u003c\/td\u003e\n\u003ctd\u003e8 (AI, 4 to 20 mA DC)\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\u003eInput 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\u003c\/td\u003e\n\u003ctd\u003e250 ohm (power on), 500 kohm or more (power off)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Current\u003c\/td\u003e\n\u003ctd\u003e25 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003e24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e3 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 degC to +85 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIngress Protection\u003c\/td\u003e\n\u003ctd\u003eIP66\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e35 mm (W) x 110 mm (H) x 58 mm (D)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eApprox. 200 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eFOUNDATION Fieldbus Analog Signal Interface Behavior\u003c\/h3\u003e\n\u003cp\u003eThe NFAI841-S50 executes 4 to 20 mA DC signal acquisition with mapping into FOUNDATION Fieldbus function block structures. Field device integration is performed through FF communication layers, allowing cyclic process variable updates from each of the 8 input channels into the control system scan cycle.\u003c\/p\u003e\n\u003cp\u003eThe module input stage is designed without galvanic isolation between signal paths, requiring common grounding reference integrity across field wiring segments. Signal conditioning is performed at the A\/D conversion stage prior to FF protocol encapsulation.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can the NFAI841-S50 channels be hot-swapped during operation?\u003c\/strong\u003e\u003cbr\u003eA: Hot-swap capability depends on system rack configuration. The module itself supports field-side signal presence detection, but removal under load requires system-level FIO rack support.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does each channel support individual electrical isolation?\u003c\/strong\u003e\u003cbr\u003eA: No. The module is specified as a non-isolated input design; all channels share a common electrical reference structure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What happens if input current exceeds 20 mA range?\u003c\/strong\u003e\u003cbr\u003eA: Inputs above full-scale 20 mA may result in saturation at the A\/D conversion stage without protective isolation limiting at channel level.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMaintain shield grounding at a single-point earth reference to prevent loop current distortion\u003c\/li\u003e\n\u003cli\u003eUse twisted-pair cabling for all 4 to 20 mA loops to reduce electromagnetic coupling\u003c\/li\u003e\n\u003cli\u003eEnsure terminal torque and mechanical seating are consistent with Yokogawa FIO rack specifications\u003c\/li\u003e\n\u003cli\u003eAvoid mixed grounding potentials across field instruments connected to the same module\u003c\/li\u003e\n\u003cli\u003eVerify power supply stability at 24 VDC with minimal ripple before energizing module backplane\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":44214251192408,"sku":"NFAI841-S50","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/2039\/0488\/files\/NFAI841-S50-2.jpg?v=1781059609","url":"https:\/\/www.industriaxplc.com\/products\/nfai841-s50-analog-input-module-yokogawa","provider":"IndustriaX Limited","version":"1.0","type":"link"}