وصف

Yokogawa NFAF135-S00 Frequency Input Module

The Yokogawa NFAF135-S00, also cataloged as the NFAF135 Frequency Input Module, operates as a dedicated hardware component for frequency measurement across 8 channels within Yokogawa STARDoM FCN/FCJ controllers. It provides direct electrical execution for acquisition of pulse, contact, and current signals in real-time data monitoring.

Hardware Specifications

Parameter	Specification
ModelBrand	Yokogawa NFAF135-S00
Origin	Japan
Weight	0.34 kg
Dimensions	Standard module form factor (approx. 160 mm x 100 mm x 60 mm)
OperatingTemp	0 to 50 degC
PowerConsumption	0.5 A maximum (5 V DC internal supply)
ChannelCount	8 frequency input channels
FrequencyRange	0.1 Hz to 10 kHz
Accuracy	±0.1% of reading
InputSignalTypes	Contact ON/OFF, voltage pulse, current pulse
Isolation	Channel-to-channel isolation supported

FOUNDATION Field bus Connectivity

The module supports 4-port FOUNDATION Fieldbus H1 communication at 31.25 kbps, enabling up to 32 devices per port depending on node power limits. Cold junction compensation (CJc) ensures stable signal measurement under variable ambient conditions. Channel-to-channel isolation mitigates cross-interference during simultaneous pulse acquisition.

Frequently Asked Questions

Q: Does the NFAF135-S00 support hot-swapping in live FCU systems?
A: No, the module must be powered down during insertion or removal to prevent bus disruption.

Q: What is the expected communication latency for all 8 channels?
A: Signal processing latency is within the standard FOUNDATION Fieldbus H1 specifications and largely depends on network load and segment configuration.

Q: Can the module be used in redundant configurations?
A: Yes, dual-redundant setup is supported to maintain continuous fieldbus operation.

Field Installation Guidelines

1. Mount the module on the compatible STARDoM FCN/FCJ backplane following proper orientation.
2. Ensure all field wiring is twisted and shielded; connect shield to system ground at a single point.
3. Maintain minimum separation from high-voltage power lines to prevent electromagnetic interference.
4. Verify input signal levels conform to module specifications before energizing.
5. Avoid mechanical stress on connector pins during insertion and removal.

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