Introduction
The Yokogawa NFAI143-H50/A4AS0 S1 Analog Input Module is a high-reliability, 16-channel isolated analog input unit designed for advanced industrial automation systems, including Yokogawa STARDOM FCN/FCJ and DCS platforms such as CENTUM VP and ProSafe-RS.
This module is engineered to accurately acquire 4–20 mA analog signals from field instruments and convert them into stable digital data for real-time process monitoring. The A4AS0 configuration typically indicates a specific hardware build variant optimized for standardized industrial I/O integration, ensuring compatibility and consistent performance across system deployments.
It is widely used in mission-critical environments where signal stability, electrical isolation, and long-term operational reliability are essential.
Technical Specifications
| Parameter | Specification |
|---|
| Model | NFAI143-H50/A4AS0 S1 |
| Manufacturer | Yokogawa |
| Type | Analog Input Module |
| Input Channels | 16 channels (isolated) |
| Input Signal | 4–20 mA DC |
| Resolution | 16-bit high precision |
| Accuracy | ±0.1% of full scale |
| Data Refresh Cycle | 10 ms |
| Step Response Time | 100 ms |
| Allowable Input Current | Up to 24 mA |
| Isolation Voltage | 1500 V AC (input to system) |
| Input Resistance | 250 Ω (power ON) |
| Transmitter Supply | 24.0–25.5 V DC |
| Power Consumption | ~230 mA (5 V), ~540 mA (24 V) |
| Operating Temperature | -20°C to +70°C |
| Weight | ~0.3 kg |
| System Compatibility | STARDOM FCN/FCJ, CENTUM, ProSafe-RS |
Applications
The NFAI143-H50/A4AS0 S1 is designed for continuous industrial use where accurate analog data acquisition is critical.
Typical applications include:
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Oil & gas production monitoring systems
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Petrochemical and refinery process control
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Power generation and turbine monitoring
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Water treatment and utility automation
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SCADA and DCS distributed control systems
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Industrial sensor and transmitter signal acquisition
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Safety instrumentation and interlock systems
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Large-scale manufacturing process automation
Its isolated design ensures stable performance even in high-noise electrical environments.
Advantages
The Yokogawa NFAI143-H50/A4AS0 S1 delivers strong operational and engineering value:
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16-channel isolated architecture improves system stability
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High-precision 16-bit conversion ensures accurate measurements
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Fast 10 ms refresh cycle supports real-time control
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1500 V electrical isolation enhances safety and reliability
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Industrial-grade long lifecycle design reduces maintenance downtime
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Strong compatibility with Yokogawa DCS ecosystems
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Stable signal processing under harsh environments
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Flexible integration with field transmitters (2-wire/4-wire systems)
Technical FAQs
1. What is the function of this module?
It converts analog 4–20 mA signals into digital data for control systems.
2. How many input channels does it support?
It supports 16 isolated analog input channels.
3. What does A4AS0 mean?
It represents a specific configuration variant within the NFAI143-H50 series.
4. What is the accuracy level?
Approximately ±0.1% of full scale.
5. Is the module isolated?
Yes, it provides full input-to-system electrical isolation.
6. What is the response time?
Around 100 ms step response time.
7. What is the data refresh cycle?
Approximately 10 ms.
8. What is the operating temperature range?
-20°C to +70°C.
9. What is the weight?
Approximately 0.3 kg.
10. Which systems is it compatible with?
Yokogawa STARDOM FCN/FCJ and major DCS platforms.
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