Overview
Configured for isolated 4-20 mA signal acquisition in Yokogawa CENTUM VP and CENTUM CS 3000 DCS platforms, the Yokogawa AAI143-H00/A4S10 (AAI143 Analog Input Module) provides direct electrical conversion of field transmitter signals into control system data.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI143-H00/A4S10 |
| Brand | Yokogawa |
| Origin | Japan |
| Product Type | Analog Input Module |
| System Compatibility | Yokogawa CENTUM VP and CENTUM CS 3000 DCS |
| Input Channels | 16 channels, isolated |
| Input Signal | 4-20 mA DC |
| Allowable Input Current | 24 mA maximum |
| Input Resistance (Power ON) | 270 ohm at 20 mA to 350 ohm at 4 mA |
| Input Resistance (Power OFF) | 500 kohm or larger |
| Measurement Accuracy | +/- 16 uA |
| Data Update Period | 10 ms |
| Transmitter Power Supply | 19.0 V DC or higher at 20 mA; 25.5 V DC or less at 0 mA |
| Output Current Limit | 25 mA |
| Transmitter Configuration | Selectable for 2-wire or 4-wire transmitters per channel |
| Withstanding Voltage | 1500 V AC for 1 minute between input and system |
| Temperature Drift | +/- 16 uA / 10 deg C |
| HART Communication | Supported |
| Terminal Connection | /A4S10 pressure clamp terminal block with surge absorber |
| Weight | Approx. 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/A4S10 supports 4-20 mA HART communication for digital field transmitter interaction. Each input channel provides electrical isolation to reduce signal interference between field loops and the DCS input interface.
The module supports configurable 2-wire and 4-wire transmitter connections through channel setting pins. In addition, the /A4S10 terminal block integrates a surge absorber for analog field signal wiring protection.
The Yokogawa CENTUM I/O architecture applies channel-to-channel isolation principles to maintain stable analog signal processing. Therefore, the module can acquire multiple transmitter inputs while maintaining separated electrical paths.
Frequently Asked Questions
Q: Does the AAI143-H00/A4S10 support HART communication?
A: Yes. The module supports HART communication over 4-20 mA input loops for compatible field transmitters.
Q: Can the input channels connect to different transmitter wiring types?
A: Yes. Each channel can be configured for either 2-wire or 4-wire transmitters through the module setting pins.
Q: What is the function of the /A4S10 terminal block?
A: The /A4S10 option provides a pressure clamp terminal block with a built-in surge absorber for analog signal connections.
Field Installation Guidelines
- Install the AAI143-H00/A4S10 module in the designated Yokogawa I/O node configuration compatible with CENTUM VP or CENTUM CS 3000 systems.
- Verify the 4-20 mA loop polarity before connecting field transmitters to the terminal block.
- Use shielded instrumentation cables for analog signal wiring where electromagnetic interference may affect measurement stability.
- Connect cable shields according to the site grounding standard and avoid creating multiple grounding points.
- Separate analog input wiring from high-voltage power cables and switching circuits.
- Confirm transmitter power requirements before enabling the module output supply function.
- Check terminal block mounting and wiring tightness during commissioning and maintenance procedures.
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