Overview
The Yokogawa AAI143-H00/K4A00, also cataloged as the AAI143 Isolated Analog Input Module, operates as a dedicated hardware component for converting 4-20 mA DC field signals into digital process data within Yokogawa CENTUM VP and CENTUM CS 3000 DCS platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI143-H00/K4A00 |
| Brand | Yokogawa |
| Origin | Japan |
| Module Type | Isolated Analog Input Module |
| System Platform | CENTUM VP / CENTUM CS 3000 DCS |
| Input Channels | 16 channels |
| Input Signal | 4-20 mA DC |
| Input Configuration | 2-wire and 4-wire transmitters |
| HART Communication | Supported |
| Channel Isolation | Input-to-system isolation |
| Allowable Input Current | 24 mA max |
| Input Resistance (Power ON) | 270 ohm at 20 mA to 350 ohm at 4 mA |
| Input Resistance (Power OFF) | 500 kohm or higher |
| Accuracy | +/- 16 uA |
| Temperature Drift | +/- 16 uA / 10 deg C |
| Data Update Period | 10 ms |
| Transmitter Power Supply | 19.0 VDC min at 20 mA to 25.5 VDC max, current limit 25 mA |
| Withstand Voltage | 1500 VAC for 1 minute between input channels and system |
| Dual Redundancy | Supported |
| Weight | Approx. 0.3 kg |
| Power Consumption | 230 mA at 5 VDC; 540 mA at 24 VDC |
4-20 mA HART Loop Protocol and Channel Isolation
The AAI143-H00/K4A00 processes standard 4-20 mA analog loops and supports HART communication for field transmitter diagnostics and parameter access. The module maintains channel-to-channel electrical separation from the system side, which reduces interference from field wiring conditions.
Additionally, the module supports transmitter power delivery for connected field devices. It handles both 2-wire and 4-wire transmitter configurations through channel-level settings. The HART interface allows digital data exchange without interrupting the primary analog measurement loop.
Frequently Asked Questions
Q: Does the AAI143-H00/K4A00 support redundant installation?
A: Yes. The module supports dual-redundant configurations within compatible Yokogawa CENTUM VP and CENTUM CS 3000 DCS architectures.
Q: What type of field signals can the AAI143-H00/K4A00 receive?
A: The module receives 4-20 mA DC current signals from 2-wire or 4-wire transmitters and converts them into digital process values.
Q: Does the module provide electrical isolation between field inputs and the control system?
A: Yes. The module provides isolation between input circuits and the system side to reduce ground loop influence and external electrical noise effects.
Field Installation Guidelines
- Install the module only in compatible Yokogawa FIO hardware assemblies designed for CENTUM VP or CENTUM CS 3000 systems.
- Verify terminal board and cable interface compatibility before wiring field devices.
- Use shielded signal cables for 4-20 mA transmitter connections where electromagnetic interference may affect measurement stability.
- Connect cable shields according to the site grounding standard and avoid multiple grounding points that may create unwanted current paths.
- Separate analog signal wiring from high-voltage power cables and switching circuits.
- Confirm transmitter loop polarity before applying power to the module.
- Check HART communication wiring conditions when commissioning smart field instruments.
- Verify module seating, backplane connection, and system recognition after installation.
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