Overview
Configured for 4-20 mA signal acquisition in CENTUM VP and CENTUM CS 3000 FIO systems, the Yokogawa AAI143-H53/K4A00 (AAI143 Analog Input Module) provides direct electrical conversion of isolated transmitter signals with HART communication support.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI143-H53/K4A00 |
| Brand | Yokogawa |
| Origin | Japan |
| Product Type | 16-channel isolated analog current input module |
| Input Channels | 16 channels, channel-to-channel isolated |
| Input Signal | 4-20 mA DC |
| Allowable Input Current | 24 mA DC |
| Transmitter Connection | 2-wire or 4-wire transmitter selectable per channel |
| Transmitter Power Supply | 19.0 V min. at 20 mA to 25.5 V max. at 0 mA, current limit 25 mA |
| Accuracy | +/- 16 uA (+/- 0.1% of full scale) |
| Temperature Drift | +/- 16 uA / 10 deg C |
| Data Update Period | 10 ms |
| Input Resistance | 270 ohm at 20 mA to 350 ohm at 4 mA during power ON |
| Input Resistance Power OFF | 500 kohm or higher |
| Digital Communication | HART protocol pass-through support |
| Isolation Voltage | 1500 VAC for 1 minute between input signal and system |
| Redundancy Configuration | Dual-redundant configuration supported |
| Power Supply | CENTUM VP FIO backplane power |
| Current Consumption | 230 mA max. at 5 VDC, 540 mA max. at 24 VDC |
| Operating Temp | -20 deg C to +70 deg C |
| Storage Temp | -40 deg C to +85 deg C |
| Environmental Protection | ISA Standard G3 corrosive gas immunity with conformal coating |
| Dimensions | Approx. 32 mm x 133 mm x 152 mm |
| Weight | Approx. 0.3 kg |
| External Interface | KS cable interface adapter ATK4A-00 |
4-20 mA HART Loop and Channel Isolation Characteristics
The AAI143-H53/K4A00 processes standard 4-20 mA DC analog signals from field transmitters and transfers measured values to the CENTUM VP or CENTUM CS 3000 control system. In addition, the module supports HART communication pass-through, allowing digital data exchange with compatible smart field devices.
Furthermore, each input channel provides galvanic isolation to reduce signal interference caused by ground potential differences. The isolated architecture separates field wiring conditions from system-side electronics and supports stable analog measurement in multi-device installations.
The module supports Yokogawa process control I/O requirements by maintaining independent channel processing, transmitter power distribution, and diagnostic communication paths.
Frequently Asked Questions
Q: Does the AAI143-H53/K4A00 support HART communication with field transmitters?
A: Yes. The module supports HART protocol pass-through for compatible smart transmitters while processing the primary 4-20 mA analog signal.
Q: Can the module connect to both 2-wire and 4-wire transmitters?
A: Yes. Each channel supports selectable 2-wire or 4-wire transmitter wiring through pin configuration.
Q: Does the module support redundant operation in the CENTUM system?
A: Yes. The AAI143-H53/K4A00 supports dual-redundant configuration when installed in compatible Yokogawa FIO architectures.
Field Installation Guidelines
- Install the module only in compatible Yokogawa FIO node units or field control stations specified for the AAI143 series.
- Verify KS cable adapter compatibility before connecting terminal boards such as AEA4D.
- Separate analog signal wiring from high-voltage power cables to reduce electromagnetic interference.
- Connect cable shields according to the plant grounding standard and avoid multiple-point shield grounding unless specified by the system design.
- Confirm transmitter loop polarity before applying field power.
- Check that the selected channel wiring configuration matches the connected 2-wire or 4-wire transmitter type.
- Verify HART communication wiring conditions before enabling device diagnostics from the control system.
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