Allen-Bradley 1444-TSCX02-02RB User Manual page 467

Source of Speed Data
Any one of the following can be identified as the speed reference for Normal
CM data.
Value
0
1
Waveform Record Length
Index 0
Samples 256
Number of samples = 256 * (2^(Index))
FFT Resolution
Defines the FFT line resolution that is used for the Normal CM data FFT. For
Advanced CM data, additional line resolutions can be requested.
Index TWF Samples
4 4096
3 2048
2 1024
1 512
0 256
(1) The Base FFT Lines represent the size of the raw processed FFT and are the number of lines returned if no adjustments are made
for decimation and filtering. Control of application of relevant factors for the applied decimation and filtering is provided in the
SpecialRequest member of the CM Record Request structure
(2) Or if -60 dB filter is applied (Aeroderivative Measurement Type)
(3) And the standard -24 dB/octave filter is applied.
The Normal CM data object specifies the transient dynamic data, note
however that it is limited to a maximum of a 900 line FFT and 2048 point
TWF. Normal CM data can be set to higher lines/samples and this setting
reflects in Trend and Alarm data but stored Transient Data is 900 line FFT and
2048 point TWF).
Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Description
Tacho/Speed 0
Tacho/Speed 1
1 2
512 1024
FFT Lines
Base FFT Decimation
(1)
Lines
None
1600 1800
800 900
400 450
200 225
100 112
(Table 206).
CIP Objects Appendix A
3 4 5
2048 4096 8192
Alternate Primary
(2) (3)
Path Path
1000 600
500 300
250 150
125 75
67 32
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