Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 465
CIP Objects Appendix A
Attribute Semantics
Waveform FFT Storage Format
A bit-wise control for the storage of the Normal CM Data.
Single setting applies to all stored Normal CM data (Trend, Alarm, and
Transient) for all channels.
This parameter has been made available within the configuration such as to
permit (future) Smart memory allocation.
Currently the internal storage is fixed as float (shown in bold previously and
represented as a return value of 0x11).
TWF/FFT data is always returned as IEEE Float/Real values across the
network.
25 Get V FFT Line
Resolution
SINT Defines the FFT line
resolution that is used
in the Normal CM, FFTs.
FFT resolution options
26 Get V FFT Window
Function
SINT Definition of window
function for FFT signal
processing.
FFT window options
28 Get V FFT Line Value
Detection/
Scaling
SINT Allows line/bin values
to be returned scaled as
Peak, Peak to Peak, or
RMS.
0: Peak
1: Peak to Peak
2: RMS (default)
Table 200 - Waveform FFT Storage Format
Bit Description
0 FFT as Float
1 FFT as 16 bit
2 FFT as 8 bit
3 Reserved
4 Waveform as Float
5 Waveform as 16 bit
6 Waveform as 8 bit
7 Reserved
Table 199 - Instance Attributes (continued)
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