Allen-Bradley 1444-TSCX02-02RB User Manual page 487

Table 233 - FFT (eFFT)
Byte Offset Structure Member
Within Structure
0 TimestampNanoSec
4 TimestampSec
8 SamplePeriodInSecs
12 Identifier
16 ucDataSelect
17 Reserved1
18 Reserved2
20 ByteCount
24 LineArray
Table 234 - Waveform (eTWF2)
Byte Offset Structure Member
Within Structure
0 TimestampNanoSec
4 TimestampSec
8 SamplePeriodInSecs
12 Identifier
16 RelativeTime
20 ByteCount
24 SampleArray
The Record Type Structures are as follows.
Data Type Description
UDINT Subsecond accuracy.
UDINT Seconds since 1970.
REAL Time period between samples or speed and number of samples per revolution can be used to
calculate the bandwidth for the FFT.
DWORD Data source, mode, tacho source, and measurement units.
BYTE If Bit 0 is set, phase array follows the mag array in the returned data array. Otherwise, just the
magnitude array is returned.
Bits 1 and 2 indicate FFT scaling: 0 Peak, 1 Peak to Peak, 2 RMS.
Bits 3 and 4 indicate the data filtering that has been applied.
Bits 5 and 6 indicate the FFT Windowing applied: 0 Normal/Rectangular, 1 Flat-Top, 2 Hanning,
3 Hamming.
BYTE
UINT
UDINT The size of the following array in bytes.
REAL The array of FFT line amplitude data.
See Reading FFT Data on page 333
from the read data.
Reference the measurement tables.
Data Type Description
UDINT Subsecond accuracy.
UDINT Seconds since 1970.
REAL Time period between samples or speed and number of samples per revolution.
DWORD Data source, mode, tacho source, and measurement units.
UDINT A 24-bit (micro-second) counter-value for finely aligning data.
See Reading Continuous Time Waveforms on page 329
UDINT The size of the following array in bytes.
REAL The array of waveform data values (samples).
See Reading TWF Data on page 332
from the read data.
Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
CIP Objects
for details on how to calculate the FFT
for information on using this parameter.
for details on how to calculate the TWF
Appendix A
487