FFT Module

The FFT module performs Fast Fourier Transforms on waveforms sampled by the Data Acquisition module.

Module icon


This module prepares the waveforms for input into other harmonics analysis and measurement modules.

NOTE: The registers and settings available in this module depend on the device or node you are configuring, as well as its firmware and template versions. Not all registers or settings are available on all devices or the Virtual Processor, and labels may vary.



The Source inputs to each FFT module are factory-linked to the outputs of the Data Acquisition module, and cannot be changed.


The Enable input is factory-linked and cannot be altered.

Setup registers

The FFT module has no setup registers.

Output registers


The output FFTs can be linked to the following modules: Harmonics Analyzer, Harmonics Evaluation, Harmonics Measurement, Mains Signaling Evaluation, Power Harmonics, Symmetrical Components, Transient and Waveform Recorder.


All events produced by the module are written into this register. Possible events and their associated priority numbers are shown in the table below:

Event priority group Priority Description
Setup Change 10 Input Links, setup registers or labels have been changed.

The Event output register stores the following information for each ION event: time stamp, priority, cause, effect, and any values or conditions associated with the cause and effect.

Responses to special conditions

The following table summarizes how the FFT module behaves under different conditions.

Condition Response of output registers
If the inputs are not available The output registers are not available.
When the device is started or powered-up (either the first time, or after a shut-down) The output registers are not available.

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