Hardware Functional Overview
The NFAF135-S50 S1 is a high-precision analog input module for the Yokogawa STARDOM FCN and FCJ autonomous controller series. It converts field analog signals into digital data for controller processing.
The module provides galvanic isolation from the system logic, helping prevent ground loops and protecting internal circuits from field-side electrical surges, making it suitable for electrically noisy industrial environments.
Detailed Engineering Specifications
| Parameter | Specification |
|---|---|
| Channels | 8 channels |
| Input Signal Type | 4–20 mA DC or 1–5 V DC |
| Channel Isolation | Not isolated between channels |
| System Isolation | 1.5 kV AC between inputs and internal logic |
| Input Impedance | 250 Ω (current input) / ≥1 MΩ (voltage input) |
| A/D Resolution | 16-bit |
| Accuracy | ±0.1% of full scale |
| Refresh Cycle | 10 ms per module |
| Power Consumption | Max 450 mA at 5 V DC (backplane powered) |
| Operating Temperature | -20°C to +60°C |
| Hardware Revision | S1 (Optimized for FCN-500 / FCN-RTU platforms) |
Primary Applications
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Process Monitoring: Pressure and flow transmitter signal acquisition in oil & gas facilities
-
Environmental Monitoring: Temperature and humidity sensing in RTU deployments
-
System Upgrade: Replacing legacy low-resolution analog I/O modules
Technical FAQ
Does it support HART communication?
No. It only supports standard analog signals. For HART communication, use HART-enabled modules such as NFAI143.
How is the input range configured?
Range selection is typically configured via STARDOM Logic Designer software. Current inputs require the 250 Ω resistor loop.
Can it be used in redundancy systems?
Yes. It can be deployed in redundant FCN architectures when software logic is configured to manage dual I/O data streams.
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