Overview
The Yokogawa AAI143-H03, also cataloged as the AAI143 Analog Input Module, operates as a dedicated hardware component for isolated 4-20 mA signal acquisition within Yokogawa CENTUM VP and CENTUM CS 3000 DCS platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI143-H03 |
| Brand | Yokogawa |
| Product Type | Isolated Analog Input Module |
| Origin | Japan |
| Input Channels | 16 isolated channels |
| Input Signal | 4-20 mA current input |
| Allowable Input Current | 24 mA max |
| Input Resistance | 270 ohm at 20 mA to 350 ohm at 4 mA (power ON); >= 500 kohm (power OFF) |
| Accuracy | +/- 16 uA |
| Data Update Period | 10 ms |
| HART Communication | Supported |
| Transmitter Power Supply | 19.0 V or higher at 20 mA; 25.5 V or less at 0 mA |
| Isolation Voltage | 1500 V AC between input and system for 1 minute |
| External Connection | Pressure clamp terminal, MIL connector cable, or dedicated adapter cable |
| Weight | 0.3 kg |
| Dimensions | 5.1 cm x 20.3 cm x 15.2 cm |
| Power Consumption | 230 mA at 5 V DC; 540 mA at 24 V DC |
4-20 mA HART Loop and Channel Isolation
The Yokogawa AAI143-H03 processes field transmitter current signals through 16 isolated input channels. Each channel supports 4-20 mA loop measurement and provides electrical separation between field wiring and the DCS system interface.
Furthermore, the module supports HART communication over the analog loop, allowing connected transmitters to exchange configuration and diagnostic data while maintaining the primary current measurement function.
The channel-to-channel isolation design reduces the influence of ground potential differences and external electrical interference during process signal acquisition.
Frequently Asked Questions
Q: Does the AAI143-H03 support HART communication on the 4-20 mA input channels?
A: Yes. The AAI143-H03 supports HART communication through the 4-20 mA analog input loop for compatible field transmitters.
Q: How many analog signals can the AAI143-H03 process simultaneously?
A: The module provides 16 isolated input channels for independent 4-20 mA current signal acquisition.
Q: What type of transmitter connection does the AAI143-H03 support?
A: The module supports 2-wire and 4-wire transmitters through channel configuration using the designated connection settings.
Field Installation Guidelines
- Install the AAI143-H03 in the designated Yokogawa I/O subsystem slot and confirm compatibility with the target CENTUM VP or CENTUM CS 3000 configuration.
- Use shielded signal cables for 4-20 mA field loops where required by site electrical standards.
- Connect cable shields according to the plant grounding specification to reduce electromagnetic interference.
- Separate analog signal wiring from high-voltage power cables and high-current switching circuits.
- Verify transmitter loop polarity before applying field power.
- Confirm channel configuration parameters before placing the input points into operation.
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