Overview
The Yokogawa AAI143-H00/A4S00, also cataloged as the AAI143 Analog Input Module, receives 4-20 mA DC signals from field transmitters within Yokogawa DCS systems. The module provides 16 non-isolated input channels, supports 2-wire and 4-wire transmitter configurations, and provides HART communication.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI143-H00/A4S00 |
| Base Model | AAI143 |
| Brand | Yokogawa |
| Module Type | Analog Input Module |
| Number of Input Channels | 16 |
| Input Signal | 4-20 mA DC |
| Input Configuration | Non-isolated, differential input |
| Transmitter Type | 2-wire or 4-wire |
| HART Communication | Available |
| Allowable Input Current | 27 mA |
| Input Resistance, Power ON | 400 ohm at 20 mA to 1000 ohm at 4 mA |
| Input Resistance, Power OFF | 500 kohm or more |
| Withstanding Voltage | 400 V |
| Accuracy | +/-16 uA |
| Data Update Period | 10 ms |
| Step Response Time | 100 ms |
| Transmitter Power Supply | 14.8 V or more at 20 mA; 26.4 V or less at 0 mA |
| Output Current Limit | 27 mA |
| Ambient Temperature Drift | +/-16 uA/10 deg C |
| Maximum Current Consumption | 310 mA at 5 V DC; 450 mA at 24 V DC |
| Weight | 0.2 kg |
| External Connection | Pressure clamp terminal, KS cable, or MIL connector cable |
| Redundant Configuration | Dual redundant configuration supported |
4-20 mA HART and DCS Signal Handling
The AAI143 processes standard 4-20 mA DC transmitter signals across 16 input channels. Each channel supports configuration for either a 2-wire or 4-wire transmitter through the specified pin setting.
The module also supports HART communication, allowing digital field-device information to coexist with the analog current signal. Therefore, the module can process the primary analog measurement while communicating with compatible HART field devices.
The supplied specifications identify the inputs as non-isolated. Consequently, installation must account for the differential input configuration and the electrical characteristics of the connected transmitter loops.
Frequently Asked Questions (FAQ)
Q: How many analog input channels does the AAI143 provide?
A: The AAI143 provides 16 non-isolated analog input channels for 4-20 mA DC signals.
Q: Does the AAI143 support HART communication?
A: Yes. The supplied specifications state that HART communication is available for the module.
Q: Can the AAI143 operate with both 2-wire and 4-wire transmitters?
A: Yes. Each channel can be configured for a 2-wire or 4-wire transmitter through the specified pin setting.
Field Installation Guidelines
- Install the module in the specified Yokogawa system hardware and follow the applicable system wiring documentation.
- Verify the transmitter loop polarity before applying power to each 4-20 mA channel.
- Confirm that the connected transmitter remains within the stated 27 mA allowable input current.
- Route analog signal wiring separately from high-voltage power and high-current switching conductors where practical.
- Use appropriate shield termination practices for the installed Yokogawa DCS cabinet and field wiring design.
- Verify the selected external connection method, including pressure clamp terminal, KS cable, or MIL connector cable.
- For HART operation, verify the complete current loop and field-device wiring before commissioning digital communication.
- For redundant configurations, verify the Yokogawa system configuration and matching hardware requirements before installation.
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