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NFAI135-S51

The Yokogawa NFAI135-S51 is a high-performance, 16-channel Analog Input Module designed for the ProSafe-RS safety instrumented system (SIS) or the CENTUM VP integrated production control system. It serves as a critical interface between field sensors and the control system, specializing in reading 4 to 20 mA DC current signals from devices such as pressure transmitters, temperature transmitters, flow meters, and valve positioners.

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Technical Specifications

Parameter Specification
Model NFAI135-S51
Compatible Systems ProSafe-RS, CENTUM VP
Input Signal 4 to 20 mA DC
Number of Channels 16
Input Impedance 250 Ω
Accuracy ±0.1% of span (at 25°C ±5°C)
Resolution 1/65,000 (16-bit)
Conversion Speed 500 ms per module (all 16 channels)
Common Mode Voltage 500 V AC (50/60 Hz) for 1 minute
Normal Mode Voltage ±5 V (peak)
Isolation Channel-to-Channel: Non-isolated
Channel-to-System: Optically isolated
Internal Power Consumption 0.55 W (Typical)
External Supply Current 33 mA per channel (at 24 V DC), 528 mA max for module
LED Indicators RUN/ERR (Run/Error), MODE, ALM, CH STATUS (per channel)
Key Diagnostics Open wire, Over-range/Under-range, Module self-diagnosis, Watchdog timer
Hot Swapping Supported
Operating Temperature -20 to 70 °C
Mounting FCS (Field Control Station) or Node
Safety Certification SIL 2 / SIL 3 (IEC 61508)
Hazardous Area Certifications FM, CSA, ATEX, IECEx, NEPSI