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, including Yokogawa STARDOM FCN/FCJ and CENTUM VP / ProSafe-RS platforms. It is engineered to convert 4–20 mA field signals into precise digital data for real-time process monitoring and control.
The “S1” variant typically indicates an updated or revised hardware version within the same functional series, maintaining full compatibility while offering improved manufacturing consistency and system integration stability. This module is widely used in process industries requiring high accuracy, electrical isolation, and long-term operational reliability.
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 (powered), ≥500 kΩ (unpowered) |
| Allowable Input Current | Up to 24 mA |
| Transmitter Supply | 24.0–25.5 V DC |
| Power Consumption | ~230 mA (5 V DC), ~540 mA (24 V DC) |
| Operating Temperature | -20°C to +70°C |
| Weight | ~0.3 kg |
| System Compatibility | STARDOM FCN / FCJ / CENTUM / ProSafe-RS |
Applications
The NFAI143-H50 S1 is built for continuous industrial operation where accurate analog signal acquisition is essential.
Typical applications include:
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Oil & gas production and pipeline monitoring
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Refinery and petrochemical process control
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Power plant instrumentation and turbine monitoring
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Water treatment and utility automation systems
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SCADA and DCS-based control environments
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Industrial sensor data acquisition networks
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Safety monitoring and interlock systems
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Large-scale manufacturing process control
Its isolated architecture ensures stable operation even in electrically noisy industrial environments.
Advantages
The Yokogawa NFAI143-H50 S1 provides strong engineering and operational value:
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16-channel isolated input design improves system reliability
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High-precision 16-bit conversion ensures accurate measurement
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Fast 10 ms refresh cycle supports real-time process control
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Strong electrical isolation (1500 V AC) enhances safety
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Stable long-term performance under continuous operation
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HART-ready architecture (variant dependent) supports smart instrumentation
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Low drift and high signal integrity design
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Seamless integration with Yokogawa control platforms
Technical FAQs
1. What is the main function of the NFAI143-H50 S1?
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 the “S1” version mean?
It generally refers to a revised or updated hardware version within the same series.
4. Is the module isolated?
Yes, it provides electrical isolation up to 1500 V AC.
5. What is the accuracy level?
Approximately ±0.1% of full scale.
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 of the module?
About 0.3 kg.
10. What systems is it compatible with?
Yokogawa STARDOM FCN/FCJ and CENTUM / ProSafe-RS systems.
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