Yokogawa NFAI841-S00 Analog I/O Module 8-Channel

Compact 8-Channel Analog I/O for Cost-Sensitive Applications

The Yokogawa NFAI841-S00 delivers economical analog signal processing in a space-efficient design, purpose-built for applications where channel-to-channel isolation is not required. This 8-channel non-isolated analog I/O module provides flexible input/output configuration with 4-20mA current loop capability, making it ideal for centralized control cabinets and non-hazardous area installations within CENTUM VP distributed control architectures.

Core Technical Specifications

• Channel Configuration: 8 channels (configurable as input or output)
• Signal Type: 4-20mA current loop (non-isolated)
• Input Accuracy: ±0.1% of span typical
• Output Accuracy: ±0.15% of span typical
• Conversion Resolution: 16-bit A/D and D/A conversion
• Scan Rate: 100ms per channel (configurable)
• Common Mode Voltage: ±10V DC maximum
• Operating Temperature: 0°C to +55°C ambient
• Power Consumption: 3.5W typical (lower than isolated variants)
• Mounting: Standard AFV nest or AMN nest compatible

Application Scenarios & Deployment Strategy

The NFAI841-S00 excels in centralized control room environments where all field signals originate from a common ground reference. Manufacturing facilities deploy it for temperature monitoring across production zones, pressure transmitter arrays in hydraulic systems, and flow measurement networks in material handling. Building automation leverages its cost efficiency for HVAC zone control, chiller plant monitoring, and energy management dashboards. Pilot plants and laboratory systems benefit from its compact footprint when prototyping process control strategies before full-scale deployment.

Design Philosophy & Cost Optimization

By eliminating per-channel isolation transformers, the NFAI841-S00 reduces material costs by approximately 40% compared to isolated modules while maintaining Yokogawa's signature reliability. This architecture is optimal when field devices share a common signal ground and electrical noise immunity requirements are moderate. The module's non-isolated design also reduces heat generation, enabling higher-density installations in temperature-controlled environments without additional cooling infrastructure.

System Integration & Configuration

The module integrates seamlessly with CENTUM VP engineering tools, supporting drag-and-drop configuration of input ranges (4-20mA, 1-5V with external resistors), alarm limits, and signal conditioning parameters. Built-in diagnostics detect open-circuit conditions, signal saturation, and A/D converter faults, reporting status via the V-net backplane to operator workstations. Hot-swappable design with automatic module recognition minimizes maintenance downtime during scheduled replacements.

Performance Benchmarks & Reliability

Field-proven in over 15,000 installations globally, the NFAI841-S00 achieves MTBF ratings exceeding 450,000 hours under normal operating conditions. Its simplified circuit topology reduces component count by 35%, directly translating to lower failure rates and extended service intervals. The module supports continuous operation in industrial environments with vibration levels up to 2G and humidity ranges of 10-90% RH non-condensing.

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