Overview
Configured for 4-20 mA signal acquisition in Yokogawa CENTUM VP and ProSafe-RS systems, the Yokogawa AAI141-S00/A4S00 (AAI141 Analog Input Module) provides 16 non-isolated current input channels with HART communication support. The /A4S00 configuration includes a pressure clamp terminal block for analog field wiring.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI141-S00/A4S00 |
| Base Model | AAI141 |
| Brand | Yokogawa |
| Module Type | Analog Input Module, Current Input, Non-Isolated |
| System Compatibility | CENTUM VP, ProSafe-RS |
| Number of Channels | 16 |
| Input Signal | 4-20 mA DC |
| Allowable Input Current | 27 mA max |
| Input Resistance, Power ON | 400 ohm at 20 mA to 1000 ohm at 4 mA |
| Input Resistance, Power OFF | 500 kohm or larger |
| Accuracy | +/- 16 uA |
| Data Update Period | 10 ms |
| Step Response Time | 100 ms |
| Transmitter Power Supply | 14.8 V or higher at 20 mA; 26.4 V or less at 0 mA |
| HART Communication | Supported |
| Temperature Drift | +/- 16 uA / 10 deg C |
| Current Consumption | 310 mA max at 5 VDC; 450 mA max at 24 VDC |
| Terminal Block | Pressure Clamp Terminal Block for Analog, /A4S00 |
| Weight | Approx. 0.2 kg, module only |
4-20 mA HART Process Input Characteristics
The AAI141-S00/A4S00 accepts standard 4-20 mA DC signals from field transmitters. The module supports HART communication while maintaining the specified analog input characteristics. Because the input circuit is non-isolated, field wiring should follow the isolation and grounding architecture defined for the associated Yokogawa I/O system.
The module provides a 10 ms data update period and a 100 ms step response time. Therefore, controller-side signal processing can use these characteristics when configuring process input functions. The allowable input current is 27 mA maximum, while the specified transmitter supply voltage varies with loop current.
Frequently Asked Questions (FAQ)
Q: Is the AAI141-S00/A4S00 an isolated analog input module?
A: No. The supplied specification identifies it as a 16-channel non-isolated current input module.
Q: What signal does the module accept?
A: Each channel accepts a 4-20 mA DC input and supports HART communication.
Q: What does the /A4S00 suffix indicate?
A: The supplied data identifies /A4S00 as the configuration that includes a pressure clamp terminal block for analog field wiring.
Field Installation Guidelines
- Verify the module model and terminal configuration before connecting field wiring.
- Confirm transmitter polarity and loop current before energizing each 4-20 mA circuit.
- Route analog signal cables separately from high-voltage power and high-current switching conductors where practical.
- Apply the Yokogawa system grounding and shield termination requirements for the installed cabinet.
- Keep cable shields and signal returns consistent with the plant grounding design.
- Confirm that the connected transmitter does not exceed the module’s 27 mA maximum allowable input current.
- Check the available transmitter loop voltage against the specified module supply characteristics before commissioning.
- Verify HART communication settings after establishing the analog loop and confirm that the required digital communication operates correctly.
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