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Product Introduction
The Yokogawa NFAI841-S50 S2 Analog I/O Module is a high-precision, multi-functional module designed for industrial automation and process control environments. As part of Yokogawa’s N-IO (Network I/O) family, this module combines reliability, scalability, and advanced diagnostics to meet the stringent requirements of modern distributed control systems (DCS) and safety instrumented systems (SIS). The S2 designation signifies enhanced safety and redundancy capabilities, ensuring uninterrupted operation even in critical process applications.
The NFAI841-S50 S2 module offers flexibility by supporting both analog input and output signals on a single platform, reducing system complexity and improving engineering efficiency. Designed for harsh industrial conditions, it ensures high measurement accuracy, fast response times, and long-term stability.
Product Specifications
| Parameter | Description |
|---|---|
| Model | NFAI841-S50 S2 |
| Manufacturer | Yokogawa Electric Corporation |
| Module Type | Analog Input/Output Module |
| Number of Channels | 8 configurable channels (input/output) |
| Signal Types | 4–20 mA DC, ±10 V DC |
| Resolution | 16-bit A/D and D/A conversion |
| Accuracy | ±0.1% of span |
| Update Rate | Approximately 100 ms |
| Isolation | Channel-to-channel and channel-to-ground isolation |
| Power Supply | 24 V DC from baseplate |
| Operating Temperature | -20°C to +55°C |
| Storage Temperature | -40°C to +85°C |
| Humidity Range | 10%–90% RH, non-condensing |
| Diagnostic Features | Loop integrity check, self-diagnosis |
| Redundancy Support | Yes, S2 version supports system redundancy |
| Mounting Method | Mounted on dedicated Yokogawa baseplate |
| Dimensions (W × H × D) | 32.8 × 107.5 × 130 mm |
| Weight | 0.3 kg |
| Certifications | CE, ATEX, IECEx (depending on system configuration) |
Applications
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Distributed Control Systems (DCS): Provides reliable analog signal acquisition and output for continuous and batch process control.
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Safety Instrumented Systems (SIS): Fully compatible with ProSafe-RS, ensuring safe operations in critical environments.
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Oil & Gas: Suitable for wellhead monitoring, pipeline control, and refinery automation.
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Power Generation: Ensures accurate signal control in boilers, turbines, and auxiliary systems.
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Chemical & Petrochemical: Handles process variables in hazardous zones requiring strict compliance.
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Water and Wastewater Treatment: Supports accurate level, flow, and pressure control for municipal and industrial applications.
Product Advantages
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Enhanced Safety and Reliability: S2 redundancy ensures continuous system operation even during component failure.
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High Accuracy and Stability: ±0.1% span accuracy and 16-bit resolution guarantee precise measurement and control.
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Configurable Flexibility: All eight channels can be configured as input or output, reducing hardware variety.
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Advanced Diagnostics: Loop integrity check and self-diagnostics minimize downtime and enable predictive maintenance.
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Hot-Swap Capability: Allows replacement without shutting down the system, improving plant availability.
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Seamless Integration: Optimized for Yokogawa’s control architecture, reducing engineering and commissioning time.
FAQ
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What signal standards does the NFAI841-S50 S2 support?
It supports 4–20 mA DC current and ±10 V DC voltage signals. -
Are channels configurable as both input and output?
Yes, all eight channels can be individually configured for either input or output. -
What is the resolution of this module?
The module provides 16-bit resolution for both analog-to-digital and digital-to-analog conversion. -
Does it provide electrical isolation?
Yes, the module offers channel-to-channel and channel-to-ground galvanic isolation. -
What is the typical update cycle?
The update time is approximately 100 milliseconds. -
Is it suitable for redundant configurations?
Yes, the S2 version is designed for redundancy in critical control systems. -
Does it support diagnostic features?
Yes, it includes self-diagnosis, loop integrity monitoring, and fault detection. -
What power does the module require?
It operates on 24 V DC, supplied through the system backplane. -
Can the module be hot-swapped during operation?
Yes, the module supports hot-swapping without process interruption. -
Is the module certified for hazardous environments?
Yes, it complies with ATEX and IECEx certifications when used in approved systems.
Related Models in the Same Series
| Model | Description |
|---|---|
| NFAI841-S00 | Analog I/O Module, Standard Version |
| NFAI851-S00 | Analog Input Module, 16 channels |
| NFAT841-S00 | Analog Output Module, 8 channels |
| NFBM841-S00 | Mixed Analog I/O Module |
| NFAO841-S00 | High-Density Analog Output Module |
| NFAR841-S00 | Redundant Analog I/O Module |
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