Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | NFAF135-S50 |
| Brand | Yokogawa |
| Origin | Japan |
| Product Type | Frequency Input Modules |
| Input Channels | 8 isolated channels |
| Input Signal | Contact ON/OFF, voltage pulse rectangular wave |
| Input Frequency Range | 0.1 Hz to 10 kHz |
| Frequency Accuracy | 0.1% of reading |
| Minimum Input Pulse Width | 40 us |
| Input Signal Level | Voltage pulse VH-VL swing value: 3 V or more |
| Contact Input | Open: 100 kohm or more, Close: 200 ohm or less |
| Contact Capacity | 12 VDC: 15 mA or more, 24 VDC: 30 mA or more |
| Voltage Pulse Level | VH: 3 to 24 VDC, VL: -1 to 8 VDC |
| Signal Source Resistance | 1 kohm or less |
| Shunt Resistance | Selectable OFF / 1000 ohm |
| Pull-up Resistance | 68 kohm at 12 VDC or 24 VDC |
| Data Refresh Cycle | 10 ms |
| Field Power Supply | Selectable 12 VDC or 24 VDC |
| Field Power Supply Limiter | 12 VDC +/-10%: 40 mA, 24 VDC +/-10%: 30 mA |
| Maximum Current Consumption | 300 mA at 5 VDC, 400 mA at 24 VDC |
| Withstanding Voltage | Input to system: 500 VAC for 1 minute; channel to channel: 500 VAC for 1 minute |
| External Connection | Pressure clamp terminal or MIL connector cable |
| Weight | 0.3 kg |
| Power Consumption | 5 VDC: 300 mA maximum; 24 VDC: 400 mA maximum |
Yokogawa DCS Signal Isolation and Pulse Processing
The Yokogawa NFAF135-S50 processes pulse signals and converts input frequency data into frequency or rotational speed values. The module maintains channel-to-channel isolation and separates field input circuits from system circuits with 500 VAC withstand capability.
In addition, the module supports Yokogawa process control I/O architectures where accurate pulse counting and frequency measurement are required. The isolated input design reduces signal interference between field devices and control system channels.
The module operates with contact inputs and voltage pulse signals. Furthermore, it supports field power selection between 12 VDC and 24 VDC, allowing connection flexibility for different external sensing devices.
Frequently Asked Questions
Q: How many input channels does the Yokogawa NFAF135-S50 support?
A: The NFAF135-S50 provides eight isolated frequency input channels for contact ON/OFF and voltage pulse signal acquisition.
Q: What type of pulse signals can the NFAF135-S50 measure?
A: The module measures rectangular voltage pulses and contact signals within a frequency range of 0.1 Hz to 10 kHz.
Q: Does the module provide electrical isolation between channels?
A: Yes. The module provides isolated channels and supports 500 VAC withstand voltage between input and system circuits and between individual channels.
Field Installation Guidelines
- Install the Yokogawa NFAF135-S50 in the specified Yokogawa I/O base module position according to system configuration requirements.
- Use suitable field wiring methods for pulse input devices and maintain correct polarity for voltage pulse connections.
- Separate frequency signal wiring from high-power cables to reduce electromagnetic interference.
- Connect cable shields according to the site grounding standard and avoid creating ground loops.
- Verify the selected field power supply voltage before connecting external devices.
- Confirm pulse signal levels, contact ratings, and source resistance values before commissioning.
- Use the specified terminal block or MIL connector accessories according to the selected suffix configuration.
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