{"product_id":"yokogawa-aai841-h00-k4a00-centum-vp-hart-analog-i-o-module","title":"Yokogawa AAI841-H00\/K4A00 CENTUM VP HART Analog I\/O Module","description":"\u003ch2\u003eYokogawa AAI841-H00\/K4A00 Analog I\/O Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for 4-20 mA HART analog signal processing in Yokogawa CENTUM CS, CENTUM VP, and ProSafe-RS FIO systems, the \u003cstrong\u003eYokogawa AAI841-H00\/K4A00\u003c\/strong\u003e (\u003cstrong\u003eAAI841\u003c\/strong\u003e Analog I\/O Module) provides direct physical\/electrical execution. Operating as an integrated 8-channel input and 8-channel output interface, the unit handles dual-directional current loop communication over standard field wiring. The module routes 4-20 mA current signals to and from field transmitters and valve positioners while simultaneously overlaying HART digital communication across the analog loop channels. Internal bus arbitration supports dual-redundant deployment across the system backplane, ensuring uninterrupted process measurement and control during single-card maintenance events.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eCode \/ Option\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eFunction \u0026amp; Description\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAAI841\u003c\/td\u003e\n\u003ctd\u003eBase Analog I\/O Module (8-channel AI \/ 8-channel AO, 4-20 mA DC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e-H\u003c\/td\u003e\n\u003ctd\u003eWith HART digital communication protocol overlay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e00\u003c\/td\u003e\n\u003ctd\u003eStandard functional type code\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\/K4A00\u003c\/td\u003e\n\u003ctd\u003eOption Code: Includes ATK4A-00 KS Cable Interface Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\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\u003eAAI841-H00\/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\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\u003e0.32 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e32 mm x 107 mm x 130 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 deg C to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eSystem backplane powered (24 VDC bus)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eAnalog I\/O Module (8-channel AI \/ 8-channel AO)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Platform\u003c\/td\u003e\n\u003ctd\u003eCENTUM VP \/ CENTUM CS \/ ProSafe-RS \/ FIO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Configuration\u003c\/td\u003e\n\u003ctd\u003eNon-isolated, 8 input channels + 8 output channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Range\u003c\/td\u003e\n\u003ctd\u003e4-20 mA DC (Input and Output)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput \/ Output Accuracy\u003c\/td\u003e\n\u003ctd\u003eInput: ±16 uA \/ Output: ±48 uA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoad Resistance\u003c\/td\u003e\n\u003ctd\u003eOutput: 0 to 750 ohm \/ Input: ~400 ohm at 20 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\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003e500 V AC for 1 minute (I\/O to system backplane)\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-to-Channel Coupling\u003c\/h3\u003e\n\u003cp\u003eThe AAI841-H00\/K4A00 executes digital parameterization and analog process variable transfers through an integrated 4-20 mA HART loop protocol layer. The analog input circuits deliver dynamic transmitter power (minimum 14.8 VDC at 20 mA), supplying loop energy directly to 2-wire process field instruments. Dedicated FSK modems on the card extract high-frequency HART digital signals without distorting the underlying 4-20 mA direct-current process measurements. Because the 8 input and 8 output channels share a common non-isolated circuit ground, field technicians must enforce strict common-mode voltage limits across all connected instruments to prevent inter-channel cross-talk and ground loop offsets.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How does the module handle dual-redundant backplane operations during a primary card fault?\u003c\/p\u003e\n\u003cp\u003eA: When deployed in a dual-redundant base unit slot pair, the secondary card continuously mirrors internal loop registers and takes over active I\/O communication within one system scan cycle without disturbing loop output states.\u003c\/p\u003e\n\u003cp\u003eQ: What precautions apply to non-isolated channel configurations on the AAI841-H00\/K4A00?\u003c\/p\u003e\n\u003cp\u003eA: Field loops must use isolated field transmitters or external signal isolators to ensure shared common-ground potentials do not inject ground loop current errors into adjacent analog channels.\u003c\/p\u003e\n\u003cp\u003eQ: What is the primary function of the \/K4A00 option code on this assembly?\u003c\/p\u003e\n\u003cp\u003eA: The \/K4A00 code designates the factory pre-installation of the ATK4A-00 KS cable interface adapter, allowing direct multi-core cable connections to external signal terminal boards.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eMount the module into a designated Yokogawa FIO base unit slot until the top and bottom mounting latches click firmly into place. Ensure the base unit chassis connects to the system ground bus via a dedicated low-impedance grounding strap prior to energizing backplane power.\u003c\/p\u003e\n\u003cp\u003eWhen wiring field loops to the \/K4A00 KS cable adapter or terminal block, route all 4-20 mA analog signal cables in individually shielded twisted-pair conduits. Ground signal cable shields at a single point on the DCS cabinet grounding bar, ensuring field-side shield ends remain completely floating and isolated from earth. Maintain standard conduit fitting connections and strain reliefs to eliminate mechanical stress on the ATK4A-00 interface connector during continuous operation.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":67597691945059,"sku":"AAI841","price":360.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/5246\/8067\/files\/328_250101bc-c054-4387-9df8-fa2f0922fe8d.jpg?v=1790669225","url":"https:\/\/www.autocontrolglobal.com\/products\/yokogawa-aai841-h00-k4a00-centum-vp-hart-analog-i-o-module","provider":"AutoControl Global","version":"1.0","type":"link"}