{"product_id":"yokogawa-aai841-s50-k4a00-analog-i-o-module","title":"Yokogawa AAI841-S50\/K4A00 Analog I\/O Module","description":"\u003cp\u003eThe Yokogawa AAI841-S50\/K4A00 is a non-isolated analog I\/O module designed for 4-20 mA signal processing in Yokogawa distributed control systems. It provides 8 analog input channels and 8 analog output channels, allowing field measurement signals to be transferred to the control system and controller output signals to be delivered to field devices. The specified configuration includes a KS Cable Interface Adapter.\u003c\/p\u003e\n\u003ch3\u003eFunctional Description\u003c\/h3\u003e\n\u003cp\u003eThe AAI841 handles both analog input and output signals within one module. Its eight input channels receive 4-20 mA signals from field transmitters, while its eight output channels provide 4-20 mA signals for control devices such as valve positioners and other current-operated equipment.\u003c\/p\u003e\n\u003cp\u003eThe module converts incoming analog signals into internal control-system data and converts output data from the field control station into corresponding analog current signals. This supports measurement and control functions through a shared I\/O module.\u003c\/p\u003e\n\u003ch3\u003eSignal and Channel Configuration\u003c\/h3\u003e\n\u003cp\u003eThe module supports up to eight analog input\/output loops. Each input channel accepts a 4-20 mA DC signal, with an allowable input current of 25 mA. Each output channel supplies a 4-20 mA signal and supports a connected load resistance of 0 to 750 ohms.\u003c\/p\u003e\n\u003cp\u003eThe input and output circuits are non-isolated. This distinction is important when checking field wiring, grounding arrangements and potential differences between connected devices. The module should not be treated as an isolated I\/O solution.\u003c\/p\u003e\n\u003ch3\u003eResponse and Accuracy\u003c\/h3\u003e\n\u003cp\u003eThe input data update period is 10 ms, with an input step response time of 100 ms. The output step response time is 40 ms. These values describe different stages of signal processing and should be considered separately when evaluating control-loop response requirements.\u003c\/p\u003e\n\u003cp\u003eThe specified input accuracy is +\/-16 uA, while output accuracy is +\/-48 uA. Output circuit-open detection operates below 0.65 mA, providing a means of identifying an open output circuit.\u003c\/p\u003e\n\u003ch3\u003eTransmitter and Output Requirements\u003c\/h3\u003e\n\u003cp\u003eThe AAI841 supports channel-level selection for 2-wire or 4-wire transmitter connections through setting pins. For 2-wire transmitters, the specified transmitter supply voltage is at least 14.8 V at 20 mA and no more than 26.4 V at 0 mA. External wiring voltage drop must be considered when checking the transmitter's minimum operating voltage.\u003c\/p\u003e\n\u003cp\u003eThe output load resistance must remain within the specified 0 to 750 ohm range. This value should be checked against the total connected load, including relevant wiring resistance.\u003c\/p\u003e\n\u003ch3\u003eModel and Ordering Configuration\u003c\/h3\u003e\n\u003cp\u003eThe complete ordering code identifies the module's standard configuration and cable interface option:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e-S: Standard type, without the HART communication designation.\u003c\/li\u003e\n\u003cli\u003e5: Configuration without explosion protection.\u003c\/li\u003e\n\u003cli\u003e0: Basic type.\u003c\/li\u003e\n\u003cli\u003e\/K4A00: KS Cable Interface Adapter, model ATK4A-00.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe \/K4A00 option identifies the specified cable interface adapter. It should be distinguished from the module's signal-processing function when checking replacement and connection requirements.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cfigure\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\u003eAAI841-S50\/K4A00\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\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eAnalog I\/O Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Channels\u003c\/td\u003e\n\u003ctd\u003e8\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\u003eChannel Isolation\u003c\/td\u003e\n\u003ctd\u003eNon-isolated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAllowable Input Current\u003c\/td\u003e\n\u003ctd\u003e25 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Accuracy\u003c\/td\u003e\n\u003ctd\u003e+\/-16 uA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Accuracy\u003c\/td\u003e\n\u003ctd\u003e+\/-48 uA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Resistance\u003c\/td\u003e\n\u003ctd\u003e400 ohms at 20 mA to 1000 ohms at 4 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Load Resistance\u003c\/td\u003e\n\u003ctd\u003e0 to 750 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCircuit-Open Detection\u003c\/td\u003e\n\u003ctd\u003eLess than 0.65 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Update Period\u003c\/td\u003e\n\u003ctd\u003e10 ms\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\u003ctr\u003e\n\u003ctd\u003eOutput Step Response Time\u003c\/td\u003e\n\u003ctd\u003e40 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Drift\u003c\/td\u003e\n\u003ctd\u003e+\/-0.1%\/10 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitter Supply Voltage\u003c\/td\u003e\n\u003ctd\u003e14.8 V minimum at 20 mA; 26.4 V maximum at 0 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitter Configuration\u003c\/td\u003e\n\u003ctd\u003e2-wire or 4-wire, selectable per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Current Consumption\u003c\/td\u003e\n\u003ctd\u003e310 mA (5 V DC); 500 mA (24 V DC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection Option\u003c\/td\u003e\n\u003ctd\u003eKS Cable Interface Adapter ATK4A-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.3 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How many field signals can the AAI841-S50\/K4A00 handle?\u003c\/p\u003e\n\u003cp\u003eA: It supports eight analog input channels and eight analog output channels, with both directions using 4-20 mA signals. The configuration supports up to eight input\/output loops.\u003c\/p\u003e\n\u003cp\u003eQ: Does the AAI841-S50\/K4A00 support HART communication?\u003c\/p\u003e\n\u003cp\u003eA: The -S suffix identifies the standard type rather than the -H HART communication type. HART capability should not be assumed for this particular ordering code.\u003c\/p\u003e\n\u003cp\u003eQ: Can this module be connected directly to a Zener barrier?\u003c\/p\u003e\n\u003cp\u003eA: No. Yokogawa specifies that a Zener barrier must not be connected to this non-isolated module. For intrinsically safe applications, an isolation barrier is required.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":69265809244402,"sku":"AAI841-S50\/K4A00","price":235.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0730\/5589\/5794\/files\/AAI841-S50.jpg?v=1753071508","url":"https:\/\/www.petrospare.com\/products\/yokogawa-aai841-s50-k4a00-analog-i-o-module","provider":"Petro Spare Industrial Limited","version":"1.0","type":"link"}