Overview
The Yokogawa AAI141-H50/K4A00, also cataloged as the AAI141 Analog Input Module, operates as a dedicated hardware component for acquiring 4-20 mA DC and 1-5 VDC transmitter signals within Yokogawa CENTUM VP and CS 3000 DCS platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI141-H50/K4A00 |
| Brand | Yokogawa |
| Origin | Japan |
| Product Type | Analog Input Module |
| Input Channels | 16 channels, non-isolated |
| Input Signal | 4-20 mA DC, 1-5 VDC, differential input support |
| Input Type | Current / Voltage Input |
| Input Resistance | 400 ohm to 1000 ohm at 20 mA; 1 Mohm or more for voltage input |
| Accuracy | +/-4 mV for voltage input; +/-20 mV for voltage range |
| 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 |
| Transmitter Configuration | 2-wire or 4-wire transmitter setting by pin configuration |
| Maximum Current Consumption | 310 mA at 5 VDC, 450 mA at 24 VDC |
| Weight | 0.2 kg |
| External Connection | Pressure clamp terminal or 40-pin MIL connector cable |
| Redundant Configuration | Supports dual redundant configuration |
4-20 mA HART Loop and DCS Signal Processing
The Yokogawa AAI141-H50/K4A00 processes standard analog transmitter signals for direct connection to Yokogawa DCS field I/O systems. The module receives 4-20 mA DC current signals and 1-5 VDC voltage signals from 2-wire and 4-wire transmitters.
Furthermore, firmware versions R3.02 or later support HART communication functions when the module is configured with the HART communication package. The module installation in remote nodes requires EB401 firmware Rev 2 or later.
The module provides individual channel configuration for transmitter wiring selection. Therefore, operators can configure each channel according to the connected transmitter type.
Frequently Asked Questions
Q: Does the Yokogawa AAI141-H50/K4A00 provide channel isolation?
A: No. The AAI141-H50/K4A00 is a non-isolated analog input module. Intrinsically safe applications require an external isolation barrier.
Q: Can the module connect directly to a Zener barrier?
A: No. The AAI141 module does not allow connection to a Zener barrier. Use an isolation barrier for intrinsically safe system applications.
Q: Does the module support redundant operation?
A: Yes. The AAI141-H50/K4A00 supports dual redundant configuration within compatible Yokogawa DCS architectures.
Field Installation Guidelines
- Install the module inside the designated Yokogawa Field Control Station or I/O node according to system hardware manuals.
- Verify transmitter wiring type before configuration because the module supports both 2-wire and 4-wire transmitter connections.
- Route analog signal cables separately from high-voltage power cables to reduce electrical interference.
- Connect cable shields according to the plant grounding standard and avoid multiple grounding points on analog signal loops.
- Confirm external transmitter power requirements before commissioning because the module supplies loop power for connected 2-wire transmitters.
- Use an isolation barrier for hazardous area installations because the module itself does not provide intrinsic safety isolation.
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