Overview
The Yokogawa AAT145-S03, also cataloged as the AAI141 Analog Input Module, operates as a dedicated signal conversion hardware component for isolated 4-20 mA analog input processing within Yokogawa FIO field control system platforms. It converts field analog signals into internal FCS data and supports direct HART device communication through integrated HART modem functions.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAT145-S03 |
| Base Model | AAI141 Analog Input Module |
| Brand | Yokogawa |
| Product Type | Analog Input Modules |
| Signal Type | 4-20 mA analog input |
| Channel Configuration | 16-channel isolated analog input |
| Isolation Function | Channel isolation for field signal separation |
| HART Communication | Integrated HART modem support |
| Maximum HART Devices | 16 devices per module |
| Maximum HART Variables | 32 points per module |
| HART Multidrop Connection | Maximum 5 devices per channel |
| HART Variable Refresh Cycle | 1 second per device; 17 seconds per ESB bus connection with 16 devices |
| Compatible Units | ANB10S, ANB10D ESB bus node units; ANB11S, ANB11D optical ESB bus node units; AFV30S, AFV30D, AFV40S, AFV40D, AFV10S, AFV10D field control units |
| Conversion Function | Field analog signal to FCS internal data conversion |
| Output Conversion | FCS internal data to analog signal conversion |
| Origin | Japan |
4-20 mA HART Loop Communication and Channel Isolation
The AAT145-S03 integrates HART modem functionality to communicate directly with HART field devices connected to each analog input channel. Therefore, the module can acquire both primary process signals and HART variables through the same field wiring interface.
The module supports up to 16 HART devices and processes a maximum of 32 HART variables per module. Additionally, HART variables can be handled as standard process input data through the %Z terminal connection for input applications.
The isolated 4-20 mA input design provides electrical separation between field circuits and internal control system data processing. This configuration supports process instrumentation applications requiring signal integrity between field devices and Yokogawa FCS control stations.
Frequently Asked Questions
Q: What type of field signals does the Yokogawa AAT145-S03 accept?
A: The AAT145-S03 accepts 4-20 mA analog input signals through 16 isolated input channels and converts them into internal FCS process data.
Q: Does the AAT145-S03 support direct HART device communication?
A: Yes. The module contains integrated HART modem functions and supports direct connection of HART devices, with up to 16 devices per module.
Q: Can HART variables be used as normal process input data?
A: Yes. HART variables can be processed as standard input data through the %Z terminal connection. This function is intended for input operations only.
Field Installation Guidelines
- Install the AAT145-S03 only in compatible Yokogawa FIO field control units or ESB bus node configurations.
- Verify module slot compatibility before installation to prevent incorrect backplane connection.
- Use shielded field wiring for 4-20 mA signal circuits when required by site grounding practices.
- Separate analog signal cables from high-voltage power cables and high-frequency switching wiring.
- Confirm field device polarity and loop wiring before applying power to the module.
- Connect HART field devices according to the approved Yokogawa wiring configuration.
- Check channel isolation requirements when integrating multiple field instruments.
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