YOKOGAWA AAI143-H50 high-density Analog Input Module
The Yokogawa AAI143-H50 is a high-density Analog Input Module belonging to the FIO (Field network I/O) family,
designed for use with the CENTUM VP and CENTUM CS 3000 Distributed Control Systems (DCS).
It is one of the most widely used modules for processing standard process signals.
1. Introduction
The AAI143-H50 is a 16-channel, isolated analog input module that accepts 4 to 20 mA signals.
The “-H” in the suffix indicates that the module is HART-compatible, allowing it to not only receive the 4-20 mA process variable but also communicate bi-directionally with smart field devices to retrieve diagnostic and calibration data.
The “50” designates its style or revision, often indicating standard features like basic isolation and performance specs.
2. Technical Parameter Table
| Feature | Specification |
| Number of Channels | 16, isolated |
| Input Signal | 4 to 20 mA |
| Allowable Input Current | 24 mA |
| Withstanding Voltage | 1500 V AC between input signals and system |
| Input Resistance | 250 $\Omega$ (Power ON), 500 k$\Omega$ or more (Power OFF) |
| Accuracy | $\pm$ 0.1% of full scale |
| Data Update Cycle | 10 ms |
| HART Communication | Supported (HART 5/6/7) |
| Current Consumption | Max. 230 mA (5 V DC internal) |
| Mounting | ANB10, ANB11, ANT10, or AFV30/40 units |
| Weight | Approx. 0.3 kg |
3. Product Advantages and Features
HART Integration: Enables the Asset Management System (PRM) to perform remote device configuration and health monitoring without visiting the field.
High Density: 16 channels in a single slim module maximize cabinet space and reduce the overall system footprint.
Channel Isolation: Each channel is electrically isolated, preventing ground loops or field-side electrical noise from affecting other channels or the system logic.
Hot-Swappable: Supports online replacement. In redundant configurations, the module can be swapped without interrupting the control loop.
Dual Redundancy: Two AAI143 modules can be installed in adjacent slots for a redundant configuration, ensuring extremely high availability for critical loops.
4. Application Cases
Oil & Gas Processing: Monitoring pressure, flow, and level transmitters across large-scale refineries.
Chemical Batching: Collecting precise analog data from high-accuracy instruments for reaction control.
Asset Management: Plants utilizing Yokogawa PRM software use this module to track instrument drift and valve signatures via HART.
Power Generation: Interfacing with boiler feed-water sensors and steam pressure transmitters.
AAI143-H50
5. Related Models & Same Series
The AAI143 is the centerpiece of the FIO analog input range.
Related Models (Analog I/O)
AAI141: The standard 16-channel analog input module (Non-HART).
AAI543: The companion 16-channel Analog Output module (4-20 mA).
AAI841: A mixed Analog I/O module (8 inputs / 8 outputs).
AAV141 / AAV142: Voltage input modules (1-5 V or -10 to +10 V).
Other Variations of AAI143
AAI143-S50: The standard version with G3 Conformal Coating for corrosive environments.
AAI143-H80: A version with different terminal connection specs or updated internal hardware.
AAI143-H53: A specific style revision often used in later versions of CENTUM VP.
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