Introduction
The Yokogawa NFAI143-H50 S1 Analog Input Module is a high-reliability, 16-channel isolated analog input unit designed for advanced industrial automation systems such as Yokogawa STARDOM FCN/FCJ, CENTUM VP, and ProSafe-RS platforms.
This module is engineered to accurately convert 4–20 mA DC field signals into precise digital data for real-time monitoring and control. The S1 revision typically represents an updated hardware or manufacturing variant within the same functional family, ensuring improved consistency, stability, and compatibility in modern industrial deployments.
It is widely used in process industries where accuracy, electrical isolation, and continuous uptime are critical.
Technical Specifications
| Parameter | Specification |
|---|
| Model | NFAI143-H50 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 |
| Isolation Voltage | 1500 V AC (input to system) |
| Input Resistance | 250 Ω (power ON), ≥500 kΩ (power OFF) |
| Allowable Input Current | Up to 24 mA |
| 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 VP, ProSafe-RS |
Applications
The NFAI143-H50 S1 is designed for high-demand industrial environments requiring stable analog signal acquisition.
Typical applications include:
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Oil & gas production monitoring systems
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Refinery and petrochemical control systems
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Power generation and turbine instrumentation
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Water treatment and utility automation
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SCADA and DCS process 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 control
Its isolated multi-channel architecture makes it especially suitable for electrically noisy industrial environments.
Advantages
The Yokogawa NFAI143-H50 S1 offers strong technical and operational benefits:
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16 fully isolated input channels for high system stability
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High-precision 16-bit conversion for accurate measurements
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Fast 10 ms refresh cycle for real-time process visibility
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1500 V electrical isolation enhances safety and noise resistance
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Stable long-term performance for continuous operation
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Strong compatibility with Yokogawa control platforms
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Low drift characteristics ensure measurement consistency
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Efficient integration with field transmitters (2-wire/4-wire systems)
Technical FAQs
1. What is the main function of this module?
It converts analog 4–20 mA signals into digital data for control systems.
2. How many channels does it support?
It supports 16 isolated analog input channels.
3. What does “S1” indicate?
It is typically a revised hardware or production variant within the same series.
4. What is the accuracy level?
Approximately ±0.1% of full scale.
5. Is the module isolated?
Yes, it provides electrical isolation up to 1500 V AC.
6. What is the response time?
Around 100 ms step response time.
7. What is the refresh cycle?
Approximately 10 ms.
8. What is the operating temperature range?
-20°C to +70°C.
9. What is the weight?
About 0.3 kg.
10. Which systems is it compatible with?
Yokogawa STARDOM FCN/FCJ and major DCS platforms.
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