Module Engineering Summary
The NFDV161-P50 S2 is a high-density digital input module designed for Yokogawa STARDOM FCN and FCJ autonomous controller systems. It provides 64 isolated digital input channels for monitoring field device status signals such as pushbuttons, limit switches, and sensor outputs.
The module features advanced edge-detection logic optimized for pushbutton operations and high-noise industrial environments, ensuring stable and reliable signal acquisition in distributed control applications.
Detailed Technical Specifications
| Parameter | Specification |
|---|---|
| Input Capacity | 64 channels (isolated in groups of 16) |
| Nominal Input Voltage | 24 V DC |
| Input Voltage Range | 20.0 – 26.4 V DC |
| Logic Threshold | OFF < 5 V DC, ON > 20 V DC |
| Input Impedance | 10 kΩ |
| Current Consumption | 2.5 mA ±20% per active channel (Max 550 mA from 5 V DC backplane) |
| Isolation | 2 kV AC between inputs and system logic |
| Group Isolation | 500 V AC between channel groups (16 channels/group) |
| Input Response Time | < 8 ms |
| Pushbutton Detection | Minimum 20 ms ON pulse |
| Max Switching Frequency | 25 Hz |
| Physical Interface | MIL connector or pressure clamp terminal |
| Operating Temperature | -20°C to +60°C |
| Weight | 0.3 kg |
Module Comparison
The NFDV161-P50 S2 provides higher channel density compared to older NFDV151 series modules. The 64-channel design reduces cabinet space requirements and is commonly used in FCN-500 and large-scale RTU deployments.
Technical FAQ
What does the S2 suffix mean?
It indicates hardware revision and compatibility with newer FCN-500 backplanes and STARDOM firmware versions.
Can this module perform high-speed pulse counting?
No. It is optimized for status monitoring and pushbutton detection. For pulse counting above 25 Hz, use dedicated counter modules such as NFCP050.
How is channel isolation implemented?
The module uses 2 kV AC isolation between field inputs and system logic, with 500 V AC isolation between four groups of 16 channels to prevent electrical noise and ground loop interference.
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