{"product_id":"yokogawa-aai835-h50-analog-i-o-module-4-in-4-out-hart-isolated-s2","title":"Yokogawa AAI835-H50 Analog I\/O Module 4-In\/4-Out HART Isolated S2","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe Yokogawa AAI835-H50 represents a versatile, high-density solution for integrated process control within the CENTUM CS 3000 and CENTUM VP ecosystems. This hybrid module combines four analog input channels and four analog output channels into a single, compact footprint, optimizing cabinet space without sacrificing performance. By providing independent isolation for every channel, the AAI835-H50 effectively eliminates ground loop interference and protects the system backbone from field-side electrical surges.\u003c\/p\u003e\n\u003cp\u003eThis module excels in demanding applications such as turbine speed control and fuel valve modulation, where simultaneous sensing and actuation are required with millisecond precision. Integrated HART 7 support allows engineers to perform remote loop calibrations and access deep secondary variables from smart transmitters and positioners. Whether managing critical pressure loops or controlling heavy-duty actuators, the AAI835-H50 ensures superior signal fidelity and long-term stability in the most rigorous industrial environments.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eTechnical Configuration\u003c\/h2\u003e\n\u003cp\u003eThe AAI835-H50 follows a specific suffix architecture that defines its communication capabilities and environmental protection standards.\u003c\/p\u003e\n\u003ch3\u003eSuffix Logic Breakdown\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e-H: Enhanced HART Communication\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe \"H\" designation confirms that the module supports bi-directional HART digital signals superimposed on the 4–20 mA analog loops. This allows the DCS to communicate directly with smart field instruments for asset management and advanced diagnostics.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e5: Standard Environmental Protection\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe digit \"5\" identifies this unit as a standard type without specific explosion-proof certifications. It is engineered for installation in safe areas or within purged cabinets, providing a cost-effective solution for general-purpose industrial control rooms.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e0: Basic System Configuration\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe final \"0\" indicates the basic hardware configuration. This version is compatible with standard ESB and ER bus node units, ensuring a seamless fit into existing Yokogawa rack architectures without requiring specialized backplane modifications.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eFeature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNumber of Channels\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4 Inputs \/ 4 Outputs (Isolated)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSignal Range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4 to 20 mA DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eHART Support\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAll Channels (Input and Output)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInput Accuracy\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e±16 µA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOutput Accuracy\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e±48 µA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eData Update Period\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e10 ms\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOutput Load Resistance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 750 Ω\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eTransmitter Power Supply\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e≥15.0 V DC (at 20 mA)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 50 °C (Standard Operating Range)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eDimensions (H x W x D)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e130 x 45 x 130 mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.2 kg (0.44 lbs)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWithstand Voltage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1.5 kV AC (Between Signals and System)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003eEngineering Installation Guide\u003c\/h2\u003e\n\u003cp\u003eSuccess in field deployment depends on adhering to these technical installation standards for the AAI835-H50:\u003c\/p\u003e\n\u003ch3\u003eWiring and Connectivity\u003c\/h3\u003e\n\u003cp\u003eThe module supports multiple connection styles, including pressure clamp terminals (ATI3S) and MIL connectors. When using MIL connectors, always apply the \/CCC01 cover to prevent dust accumulation and accidental short circuits. For high-vibration environments, the pressure clamp terminal provides the most secure physical connection.\u003c\/p\u003e\n\u003ch3\u003eSignal Integrity and Loop Resistance\u003c\/h3\u003e\n\u003cp\u003eVerify that the total loop resistance for output channels does not exceed 750 Ω. If using HART communication, ensure the loop impedance remains above 230 Ω to prevent signal attenuation. For input channels, the module provides a built-in power supply for 2-wire transmitters; ensure the field device consumption does not exceed 25 mA to avoid triggering the overcurrent limiter.\u003c\/p\u003e\n\u003ch3\u003eGrounding Strategy\u003c\/h3\u003e\n\u003cp\u003eConnect the cable shields at the cabinet side only to avoid creating ground loops. The AAI835-H50 provides robust internal isolation, but maintaining a clean, single-point ground for the I\/O rack remains essential for minimizing electromagnetic noise in high-frequency environments.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eEngineering Advantages\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHybrid Efficiency\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBy integrating both input and output functions, the AAI835-H50 reduces the number of spare parts required in inventory. It allows for the local control of a process loop (Sense and Act) within a single hardware module, reducing bus traffic and improving overall system response times.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Speed Processing\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA 10ms data update period makes this module suitable for fast-acting control loops. It captures rapid process fluctuations in steam systems or hydraulic circuits that slower modules might miss, providing a more stable control curve.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eComprehensive Diagnostics\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module detects \"Circuit-Open\" conditions when the output current drops below 0.65 mA. This immediate feedback allows maintenance teams to identify broken wires or disconnected actuators instantly, significantly reducing Mean Time To Repair (MTTR).\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eDelivery and Logistics\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDelivery Time:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e3-5 business days following payment confirmation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShipping Courier:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWorldwide express delivery via\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eDHL, FEDEX, or UPS\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePackaging:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eEach unit is shipped in\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eOriginal Factory-Sealed\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eanti-static packaging to ensure it arrives in \"As-Manufactured\" condition.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eTechnical FAQs\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ1: Can I use the AAI835-H50 with a 3-wire or 4-wire transmitter?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA1: Yes. While the module provides power for 2-wire transmitters, you can connect externally powered 3-wire or 4-wire transmitters to the input channels. Ensure the common ground is referenced correctly according to the Yokogawa wiring diagram.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ2: What is the benefit of the \/13D10 Dual Pressure Clamp option?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA2: The \/13D10 option provides a dual-terminal interface with built-in surge absorbers. This is highly recommended for field wiring that travels through outdoor cable trays where lightning strikes or induced surges are a risk.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ3: Does the HART communication slow down the 4-20mA signal update?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA3: No. The HART digital signal lives on a much higher frequency than the analog signal. The AAI835-H50 processes both simultaneously, maintaining its 10ms update rate for the control signal regardless of HART data traffic.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ4: Is it possible to mix HART and non-HART devices on the same module?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA4: Absolutely. You can connect standard 4-20mA devices to some channels and HART-enabled devices to others. The module will automatically communicate with the HART devices while treating the others as standard analog signals.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":45910083240109,"sku":"AAI835-H50","price":1499.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/AAI835-H50-1.jpg?v=1776221553","url":"https:\/\/www.maxwellplc.com\/products\/yokogawa-aai835-h50-analog-i-o-module-4-in-4-out-hart-isolated-s2","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}