Overview

The YOKOGAWA NFAF135-S00 Frequency Input Module is designed for industrial automation applications that require precise frequency measurement. It offers isolated channels for high-noise environments and a wide frequency measurement range, making it suitable for various process control tasks.

Technical Specifications

General

• Number of Input Channels: 8, isolated channels
• Input Signal: Contact ON/OFF, voltage pulse (rectangular wave)
• Input Frequency: 0.1 Hz to 10 kHz
• Frequency Accuracy: 0.1% of reading

Withstanding Voltage

• Between input and system: 500 V AC for 1 minute
• Between channels: 500 V AC for 1 minute

Minimum Input Pulse Width

• 40 μs

Input Signal Level

• Contact Input:
  • Open: 100 kΩ or more
  • Close: 200 Ω or less
• Voltage Pulse Input:
  • VH-VL (swing value): 3 V or more
  • VH (high level): 3 to 24 V DC
  • VL (low level): -1 to 8 V DC

Signal Source Resistance

• 1 kΩ or less

Shunt Resistance

• Select from OFF/1000 Ω (Open when power is OFF)

Pull-up Resistance

• 68 kΩ (12 V DC or 24 V DC)

Data Refresh Cycle

• 10 ms

Field Power Supply

• Can select 24 V DC/12 V DC.

Limiter Value

• 12 V DC ±10 %: 40 mA
• 24 V DC ±10 %: 30 mA

Maximum Current Consumption

• 300 mA (5 V DC)
• 400 mA (24 V DC)

Weight

• 0.3 kg

External Connection

• Pressure clamp terminal, MIL connector cable