Introduction
The Yokogawa NFAI143-S50 Analog Input Module is a high-density, industrial-grade analog input unit designed for use in Yokogawa STARDOM FCN/FCJ distributed control systems. It is engineered to convert field-level analog signals (primarily 4–20 mA current signals) into accurate digital values for process monitoring, automation control, and system diagnostics.
This module is widely adopted in industrial environments such as oil & gas, petrochemical, power generation, and water treatment plants, where stable signal acquisition and long-term reliability are essential. Its isolated architecture and robust design ensure consistent performance even in electrically noisy and harsh operating conditions.
Technical Specifications
| Parameter | Specification |
|---|
| Model | NFAI143-S50 |
| Manufacturer | Yokogawa |
| Type | Analog Input Module |
| System Platform | STARDOM FCN / FCJ |
| Input Channels | 16 channels (isolated current input) |
| Input Signal | 4–20 mA DC / 0–20 mA DC |
| Resolution | 16-bit high precision |
| Accuracy | ±0.1% of full scale |
| Data Refresh Cycle | 10 ms |
| Step Response Time | 100 ms |
| Input Range | 0–24 mA |
| Isolation | Electrical isolation between input and system |
| Input Resistance | 250 Ω (power ON), ≥500 kΩ (power OFF) |
| Overcurrent Protection | Supported |
| Power Supply | 24 V DC system supply |
| Operating Temperature | -20°C to +70°C |
| Weight | ~0.2–1.0 kg (variant dependent) |
| Mounting | Rack / FCN system backplane |
Applications
The NFAI143-S50 is designed for high-reliability analog signal acquisition in continuous industrial operations.
Typical applications include:
-
Oil and gas production monitoring systems
-
Refinery and petrochemical process control
-
Power generation and turbine instrumentation
-
Water treatment and utility automation systems
-
SCADA and DCS distributed control environments
-
Industrial sensor and transmitter signal acquisition
-
Manufacturing process monitoring
-
Equipment diagnostics and condition monitoring
Its isolated multi-channel design makes it ideal for large-scale process automation systems requiring stable and noise-resistant signal handling.
Advantages
The Yokogawa NFAI143-S50 delivers strong industrial performance benefits:
-
16-channel isolated architecture improves system reliability
-
High-resolution 16-bit conversion ensures precise measurement
-
Fast 10 ms refresh cycle supports real-time control
-
Stable operation in harsh environments
-
Strong electrical isolation design enhances safety
-
Flexible 4–20 mA / 0–20 mA compatibility
-
Low signal drift for long-term accuracy
-
Seamless integration with Yokogawa FCN systems
Technical FAQs
1. What is the main function of the NFAI143-S50?
It converts analog current signals into digital data for control systems.
2. How many channels does it support?
It supports 16 analog input channels.
3. What signal types are supported?
4–20 mA and 0–20 mA current signals.
4. Is the module isolated?
Yes, it provides electrical isolation between input and system.
5. What is the accuracy?
Approximately ±0.1% of full scale.
6. What is the response time?
About 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?
Around 0.2–1.0 kg depending on configuration.
10. What system is it used with?
Yokogawa STARDOM FCN/FCJ control systems.
A DCS Q Co., Ltd. - PLC and DCS Industrial Control Equipment Wholesale
