{"product_id":"nfai835-s51-analog-input-output-module-yokogawa-4-20ma","title":"NFAI835-S51 Analog Input Output Module YOKOGAWA 4-20mA","description":"\u003ch2\u003e\u003cstrong\u003eYOKOGAWA NFAI835-S51 Analog I\/O Module\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand \u0026amp; Model:\u003c\/strong\u003e YOKOGAWA \/ \u003cstrong\u003eNFAI835-S51\u003c\/strong\u003e – 4-channel input, 4-channel output, isolated.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Channels:\u003c\/strong\u003e 4 channels accept 4 to 20 mA signals from transmitters. You can configure each channel for 2-wire or 4-wire transmitters via terminal connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Channels:\u003c\/strong\u003e 4 channels source 4 to 20 mA to actuators or control devices. Each output features a fallback value that you set per channel for safety.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransmitter Power Supply:\u003c\/strong\u003e The module provides a loop power supply of 20.2 to 29.3 V DC, with a current limit of 25 mA per channel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolation \u0026amp; Withstanding Voltage:\u003c\/strong\u003e The NFAI835-S51 withstands 500 V AC between input\/output and system, and 500 V AC between individual channels. This ensures robust noise rejection and long-term reliability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccuracy \u0026amp; Drift:\u003c\/strong\u003e Input accuracy is ± 0.1 % of full scale. Output accuracy is ± 0.3 % of full scale. Temperature drift stays within ± 0.01 % per °C, maintaining stable performance across a wide operating range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed \u0026amp; Response:\u003c\/strong\u003e The data refresh cycle is 10 ms. Both input and output step response times are 100 ms, enabling fast closed-loop control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironmental \u0026amp; Physical:\u003c\/strong\u003e The module operates from -20 °C to +70 °C. It consumes 360 mA at 5 V DC and 450 mA at 24 V DC. The unit weighs only 0.3 kg and uses a 40-pin MIL connector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHART \u0026amp; Protocols:\u003c\/strong\u003e Built-in HART passthrough allows you to communicate with smart field devices. RTU, WTR, and PCT options are enabled for this specific version.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e YOKOGAWA \u003cstrong\u003eNFAI835-S51\u003c\/strong\u003e (Analog I\/O, 4 in \/ 4 out).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Range:\u003c\/strong\u003e 4 to 20 mA (scalable).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Range:\u003c\/strong\u003e 4 to 20 mA (sink\/source).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResolution:\u003c\/strong\u003e 14-bit for input, 12-bit for output (typical).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLinearity:\u003c\/strong\u003e ± 0.05 % of span (input), ± 0.1 % of span (output).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e DC to 30 Hz (-3 dB) for both input and output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensitivity:\u003c\/strong\u003e 1 µA per count for input, 2 µA per count for output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e Operating -20 °C to +70 °C; storage -40 °C to +85 °C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHumidity Tolerance:\u003c\/strong\u003e 5 % to 95 % RH (non-condensing).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterference Immunity:\u003c\/strong\u003e Common mode rejection \u0026gt; 120 dB at 50\/60 Hz. Series mode rejection \u0026gt; 60 dB at 50\/60 Hz.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDielectric Strength:\u003c\/strong\u003e 500 V AC for 1 minute between channels and system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions (FAQ)\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Can I use the NFAI835-S51 with a YOKOGAWA Centum VP system?\u003c\/strong\u003e\u003cbr\u003eA: Yes, the \u003cstrong\u003eNFAI835-S51\u003c\/strong\u003e is fully compatible with all YOKOGAWA DCS series that use the standard backplane.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Does this module support HART communication on both inputs and outputs?\u003c\/strong\u003e\u003cbr\u003eA: Yes, HART passthrough works on all 4 input channels and all 4 output channels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: What is the maximum cable length for the 4-20 mA signals?\u003c\/strong\u003e\u003cbr\u003eA: For analog signals, we recommend a maximum cable length of 300 meters for reliable accuracy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Can I configure the output fallback value while the system runs?\u003c\/strong\u003e\u003cbr\u003eA: Yes, you can set the fallback value per channel online without stopping the controller.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Do you have stock for this model right now?\u003c\/strong\u003e\u003cbr\u003eA: Yes, we keep the \u003cstrong\u003eNFAI835-S51\u003c\/strong\u003e in stock for immediate shipment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: What is the return policy if the module does not fit my application?\u003c\/strong\u003e\u003cbr\u003eA: We offer a \u003cstrong\u003e30-day return policy\u003c\/strong\u003e – just contact us for an RMA number.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Does the module provide transmitter power for 4-wire devices?\u003c\/strong\u003e\u003cbr\u003eA: The internal power supply (20.2–29.3 V) can power 2-wire transmitters. For 4-wire, you need an external supply.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: How does the module handle overvoltage on input channels?\u003c\/strong\u003e\u003cbr\u003eA: Each input includes overvoltage protection up to ±30 V DC without damage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin-top: 20px;\"\u003e\u003cstrong\u003eContact Information Inquiries:\u003c\/strong\u003e \u003ca href=\"mailto:sales@nex-auto.com\"\u003esales@nex-auto.com\u003c\/a\u003e , \u003ca href=\"https:\/\/wa.me\/8615392496282\" target=\"_blank\"\u003e+86 153 9242 9628\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"margin-top: 10px;\"\u003e\u003cstrong\u003ePartner NexAuto Technology Limited:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.nex-auto.com\/\" target=\"_blank\"\u003ehttps:\/\/www.nex-auto.com\/\u003c\/a\u003e\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":46825295282337,"sku":"NFAI835-S51","price":228.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0673\/5390\/3265\/files\/NFAI835-S51.jpg?v=1785996662","url":"https:\/\/www.autonexcontrol.com\/products\/nfai835-s51-analog-input-output-module-yokogawa-4-20ma","provider":"AutoNex Controls Limited ","version":"1.0","type":"link"}