Introduction
The Yokogawa NFAI841-S00 Analog I/O Module is a compact, high-performance hybrid I/O unit designed for STARDOM FCN/FCJ distributed control systems (DCS) and industrial automation platforms. It provides both analog input and output functions within a single module, enabling efficient signal acquisition and control in process industries.
Engineered for 4–20 mA and 1–5 V analog signals, the NFAI841-S00 is widely used in applications that require flexible I/O configuration, high accuracy, and stable long-term operation. Its modular design allows seamless integration into Yokogawa’s control architecture for scalable and reliable system expansion.
Technical Specifications
| Parameter | Specification |
|---|
| Model | NFAI841-S00 |
| Manufacturer | Yokogawa |
| Type | Analog Input / Output Module |
| System Platform | STARDOM FCN / FCJ / CENTUM compatible systems |
| Input Channels | 8 channels |
| Output Channels | 8 channels |
| Input Signal | 4–20 mA DC / 1–5 V DC |
| Output Signal | 4–20 mA DC |
| Resolution | 16-bit high precision A/D & D/A conversion |
| Accuracy | ±0.1% of full scale (input), ±0.3% (output) |
| Data Refresh Cycle | Approx. 10 ms |
| Load Resistance (Output) | 0–750 Ω |
| Input Resistance | 250 Ω (powered), ≥500 kΩ (unpowered) |
| Isolation | Non-isolated differential design (system dependent) |
| Power Supply | 24 V DC (via backplane) |
| Current Consumption | Approx. 300–500 mA (system dependent) |
| Operating Temperature | -20°C to +55°C |
| Storage Temperature | -40°C to +85°C |
| Humidity | 5–95% RH non-condensing |
| Dimensions | Approx. 130 × 107.5 × 32.8 mm |
| Weight | ~0.25–0.3 kg |
| Mounting Type | Rack / base unit installation |
Applications
The NFAI841-S00 is designed for flexible industrial control environments requiring both measurement and actuation capabilities.
Typical applications include:
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Oil & gas process automation systems
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Petrochemical and refinery control loops
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Power generation monitoring and regulation
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Water and wastewater treatment plants
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SCADA and DCS distributed control systems
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Industrial sensor signal acquisition
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Actuator and valve control systems
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Manufacturing process automation
Its combined I/O capability reduces hardware complexity and improves system efficiency in medium-scale control architectures.
Advantages
The Yokogawa NFAI841-S00 delivers strong engineering and operational advantages:
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8 AI + 8 AO hybrid design reduces system footprint
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High-resolution 16-bit conversion ensures accurate signal processing
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Fast 10 ms refresh cycle supports responsive control
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Flexible input support (4–20 mA / 1–5 V) increases compatibility
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Stable industrial-grade performance for continuous operation
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Seamless integration with Yokogawa DCS systems
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Compact modular structure simplifies system expansion
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Reliable long-term stability in process environments
Technical FAQs
1. What is the main function of the NFAI841-S00?
It provides both analog input and output signal processing in one module.
2. How many channels does it support?
It supports 8 analog input channels and 8 analog output channels.
3. What signals are supported?
It supports 4–20 mA current and 1–5 V voltage signals.
4. Is the module isolated?
It is typically a non-isolated differential design depending on configuration.
5. What is the accuracy level?
Approximately ±0.1% for input and ±0.3% for output.
6. What is the response speed?
About 10 ms data refresh cycle.
7. What is the output load capacity?
Up to approximately 750 Ω loop resistance.
8. What is the weight of the module?
Around 0.25–0.3 kg.
9. What systems is it compatible with?
Yokogawa STARDOM FCN/FCJ and CENTUM control systems.
10. What makes it a hybrid module?
It combines both analog input and analog output functions in a single unit.
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