Overview
Configured for analog signal acquisition and HART field device communication in Yokogawa CENTUM CS and CENTUM VP DCS platforms, the Yokogawa AAI141-H00/K4A00 (AAI141 Analog Input Module) provides direct electrical conversion of 4-20 mA and 1-5 VDC field signals into internal control data. The module provides 16 non-isolated input channels, supports HART communication, and operates with field transmitters connected to Field Control Stations.
Suffix Breakdown & Model Matrix
| Code | Specification |
|---|---|
| AAI141 | 16-channel Analog Input Module |
| -H00 | Standard model with digital communication support |
| /K4A00 | KS Cable Interface Adapter option for connection flexibility |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAI141-H00/K4A00 |
| Base Model | AAI141 |
| Brand | Yokogawa |
| Product Type | Analog Input Module |
| System Compatibility | CENTUM CS and CENTUM VP DCS |
| Origin | Japan |
| Number of Input Channels | 16 channels |
| Channel Configuration | Non-isolated |
| Input Signal Range | 4-20 mA DC or 1-5 V DC |
| Supported Transmitters | 2-wire and 4-wire transmitters |
| Communication Protocol | HART communication |
| Current Input Accuracy | +/- 16 uA |
| Voltage Input Accuracy | +/- 4 mV |
| Data Update Period | 10 ms |
| Input Step Response Time | 100 ms |
| Transmitter Power Supply | 14.8 V minimum at 20 mA |
| Transmitter Power Supply | 26.4 V maximum at 0 mA |
| Allowable Current Input | 25 mA maximum |
| Allowable Voltage Input | +/- 7.5 V maximum |
| Power Consumption at 5 VDC | 310 mA maximum |
| Power Consumption at 24 VDC | 500 mA maximum |
| Weight | Approx. 0.30 kg |
| Redundancy Support | Supports dual-redundant system configurations |
4-20 mA HART Loop Protocol and Signal Processing
The AAI141-H00/K4A00 processes standard 4-20 mA and 1-5 VDC process signals from connected field transmitters. Each input channel transfers measured analog data into the internal DCS architecture for control and monitoring functions.
In addition, the module supports HART communication for compatible smart field devices. The analog loop carries the primary process signal while HART communication transfers digital device information over the associated signal circuit.
The module uses 16 non-isolated input channels. Therefore, field wiring design should consider common reference arrangements, shield termination practices, and potential differences between connected signal circuits. Proper cable routing also helps reduce electrical noise coupling into low-level analog measurement signals.
Frequently Asked Questions (FAQ)
Q: What input signals does the Yokogawa AAI141-H00/K4A00 support?
A: The module accepts 4-20 mA DC and 1-5 V DC analog input signals from compatible 2-wire and 4-wire field transmitters.
Q: Does the AAI141-H00/K4A00 support HART communication?
A: Yes. The AAI141-H00/K4A00 supports HART communication for compatible smart field devices while processing standard analog process signals.
Q: What is the maximum power consumption of the module?
A: The maximum current consumption is 310 mA at 5 VDC and 500 mA at 24 VDC.
Field Installation Guidelines
Install the AAI141-H00/K4A00 in the specified Yokogawa I/O mounting location and verify compatibility with the installed CENTUM CS or CENTUM VP system configuration before energizing the circuit.
Separate analog signal cables from high-current power conductors, motor cables, and switching circuits where practical. In addition, use appropriate shielded cables for low-level analog signals and terminate cable shields according to the applicable system grounding practice.
Verify the transmitter supply requirements before connecting 2-wire field devices. Confirm input signal polarity and ensure that the applied current or voltage remains within the specified allowable input limits.
Before commissioning, check field wiring continuity, signal references, and channel assignments. Then verify the measured process signal and HART communication response through the applicable Yokogawa engineering or maintenance system.
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