NFAF135-S00 Frequency Input Module Yokogawa

Hardware Specifications

Channel Isolation and Frequency Signal Processing

The Yokogawa NFAF135-S00 uses isolated input channels to acquire frequency-based field signals while separating each input path from the internal control system. Therefore, the module reduces signal interference between connected devices and supports direct processing of contact and voltage pulse inputs.

The module measures input frequencies from 0.1 Hz to 10 kHz with an accuracy of 0.1% of reading. Additionally, it supports a minimum input pulse width of 40 us, allowing the module to process high-speed switching signals from field devices.

For Yokogawa process control configurations, the module design follows the DCS and controller I/O requirements for signal isolation. Channel-to-channel isolation improves measurement stability when multiple field pulse sources operate within the same control cabinet.

Frequently Asked Questions

Q: How many input channels does the Yokogawa NFAF135-S00 provide?
A: The module provides 8 isolated input channels for contact ON/OFF and voltage pulse signals.

Q: What frequency range can the NFAF135-S00 measure?
A: The module accepts frequency input signals from 0.1 Hz to 10 kHz with a frequency accuracy of 0.1% of reading.

Q: What power supply values does the module require?
A: The module consumes a maximum of 300 mA at 5 VDC and 400 mA at 24 VDC.

Field Installation Guidelines

Install the Yokogawa NFAF135-S00 on the specified FA-M3 system base configuration and verify the module seating position before applying power.

Connect field frequency input wiring according to the terminal assignment defined by the system configuration documents. Use shielded cables for pulse signal wiring when electromagnetic interference may affect signal quality.

Separate frequency signal cables from high-current power cables and switching circuits. Connect cable shields according to the cabinet grounding design to reduce electrical noise coupling.

Confirm the input device voltage level before connection. Check that contact outputs and voltage pulse sources match the module input specifications before system operation.

Verify the module power consumption requirements during cabinet design to maintain correct 5 VDC and 24 VDC supply loading conditions.