Overview
The Yokogawa AAI143-H00/K4A00, also cataloged as the AAI143 Analog Input Module, operates as a dedicated hardware component for 4-20 mA HART signal acquisition within Yokogawa CENTUM VP and CENTUM CS 3000 DCS platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI143-H00/K4A00 |
| Brand | Yokogawa Electric Corporation |
| Origin | Japan |
| Product Type | 16-channel Analog Input Module with HART communication |
| Input Channels | 16 isolated channels |
| Input Signal | 4-20 mA DC current input |
| Transmitter Type | 2-wire and 4-wire transmitter compatible |
| HART Communication | Supported |
| Input Resistance | 270 ohm at 20 mA to 350 ohm at 4 mA (Power ON); >= 500 kohm (Power OFF) |
| Transmitter Power Supply | 19.0 V DC or higher at 20 mA; 25.5 V DC or less at 0 mA |
| Current Limit | 25 mA |
| Accuracy | +/- 16 uA |
| Data Update Period | 10 ms |
| Temperature Drift | +/- 16 uA per 10 deg C change |
| Withstanding Voltage | 1500 V AC between input and system for 1 minute |
| Redundancy Configuration | Dual-redundant configuration supported |
| External Connection | KS cable interface adapter ATK4A-00 |
| Weight | Approximately 0.3 kg |
| Power Consumption | 230 mA at 5 V DC; 540 mA at 24 V DC |
4-20 mA HART Loop Protocol and Channel Isolation
The AAI143-H00/K4A00 processes standard 4-20 mA field current signals and supports HART digital communication through the same analog loop. Therefore, operators can configure smart transmitters, read diagnostic information, and perform parameter adjustments through the DCS engineering environment without interrupting process measurement.
The module provides channel-to-channel isolation for individual input circuits. Additionally, the transmitter power supply function supports direct connection to compatible field transmitters while maintaining controlled current output limits.
The module supports dual-redundant installation within Yokogawa CENTUM VP and CENTUM CS 3000 systems. This configuration allows the control system to maintain signal processing availability during module replacement or hardware service operations.
Frequently Asked Questions
Q: Does the AAI143-H00/K4A00 support both 2-wire and 4-wire transmitters?
A: Yes. The module supports both transmitter configurations through channel setting selection.
Q: What communication protocol does the AAI143-H00/K4A00 use for smart transmitters?
A: The module supports the HART protocol over 4-20 mA current loops for digital field device communication.
Q: Can the module operate in a redundant DCS configuration?
A: Yes. The AAI143-H00/K4A00 supports dual-redundant configurations in compatible Yokogawa CENTUM systems.
Field Installation Guidelines
- Install the module according to the Yokogawa I/O subsystem hardware configuration manual and approved cabinet layout requirements.
- Connect field signal wiring using appropriate shielded instrumentation cables to reduce electromagnetic interference.
- Ground cable shields according to the plant grounding standard and avoid multiple grounding points that may create ground loops.
- Separate analog input wiring from high-voltage power cables and switching circuits.
- Verify transmitter polarity, loop current direction, and terminal connections before applying system power.
- Confirm HART communication quality after installation by checking transmitter addressing and digital communication status.
- Ensure the KS cable interface adapter is correctly seated before commissioning the I/O station
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