Yokogawa AAI841-H00/K4A00 CENTUM VP HART Analog I/O Module
Manufacturer: Yokogawa
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Part Number: AAI841
Condition：New with Original Package
Product Type: Analog I/O Modules
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Country of Origin: Japan
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Yokogawa AAI841-H00/K4A00 Analog I/O Module
Configured for 4-20 mA HART analog signal processing in Yokogawa CENTUM CS, CENTUM VP, and ProSafe-RS FIO systems, the Yokogawa AAI841-H00/K4A00 (AAI841 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.
Suffix Breakdown & Model Matrix
| Code / Option | Function & Description |
|---|---|
| AAI841 | Base Analog I/O Module (8-channel AI / 8-channel AO, 4-20 mA DC) |
| -H | With HART digital communication protocol overlay |
| 00 | Standard functional type code |
| /K4A00 | Option Code: Includes ATK4A-00 KS Cable Interface Adapter |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI841-H00/K4A00 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.32 kg |
| Dimensions | 32 mm x 107 mm x 130 mm |
| Operating Temp | -20 deg C to +70 deg C |
| Power Consumption | System backplane powered (24 VDC bus) |
| Product Type | Analog I/O Module (8-channel AI / 8-channel AO) |
| System Platform | CENTUM VP / CENTUM CS / ProSafe-RS / FIO |
| Channel Configuration | Non-isolated, 8 input channels + 8 output channels |
| Signal Range | 4-20 mA DC (Input and Output) |
| Input / Output Accuracy | Input: ±16 uA / Output: ±48 uA |
| Load Resistance | Output: 0 to 750 ohm / Input: ~400 ohm at 20 mA |
| Data Update Period | 10 ms |
| Isolation | 500 V AC for 1 minute (I/O to system backplane) |
4-20 mA HART Loop Protocol & Channel-to-Channel Coupling
The 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.
Frequently Asked Questions
Q: How does the module handle dual-redundant backplane operations during a primary card fault?
A: 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.
Q: What precautions apply to non-isolated channel configurations on the AAI841-H00/K4A00?
A: 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.
Q: What is the primary function of the /K4A00 option code on this assembly?
A: 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.
Field Installation Guidelines
Mount 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.
When 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.