Allen-Bradley 1444-TSCX02-02RB User Manual page 471

Table 209 - FFT (eFFT)
Byte Offset Structure Member
Within Structure
0 TimestampNanoSec
4 TimestampSec
8 SamplePeriodInSecs
12 Identifier
16 ucDataSelect
17 ucSpeedByte0
18 ucSpeedByte1
19 ucSpeedByte2
20 ByteCount
24 LineArray
Table 210 - Waveform (eTWF)
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 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 RPM value of the referenced speed source for the FFT data.
Actual RPM = Value/100
Value provided is a 24 bit (3 byte) integer.
First (least significant) byte, bits 0...7.
BYTE Second byte, bits 8...15
BYTE Last byte, bits 16...23
UDINT The size of the following array in bytes.
REAL The array of FFT line amplitude data.
See Reading FFT Data on page
from the read data.
Data Type Description
UDINT Subsecond accuracy.
UDINT Seconds since 1970.
REAL Time period between samples or speed and no 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
333for details on how to calculate the FFT
for information on using this parameter.
for details on how to calculate the TWF
CIP Objects Appendix A
471