190 Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Chapter 4 Measurement Definition
Sample Resolution
While the TWF and FFT defined on the FFT Page are limited in size to a
maximum of 8192 TWF Samples and 1800 FFT Lines, far higher resolution
data can be read from the demand buffer. The following table provides the size
selections available from the demand buffer.
Cross Module Synchronized Measurements
The Demand buffer allows for reading the measurements from multiple
modules that were sampled simultaneously. Besides the raw channel data that is
sampled from the specified signal source location, the buffer also retains each
of the two TTL tachometer signals. As a result, software can request data from
different modules that start at the same tachometer pulse, so long as the
modules share the TTL signal.
FFT Lines
TWF Samples Base FFT Lines
(1)
(1) The Base FFT Lines can potentially be the selections that are provided by the software application as how the selections are
presented is a function of the application software. However, the actual number of FFT Lines served by the module is dependent
on the decimation and filtering applied as shown.
Decimation
None Alternate Path
(2)
(2) Or if the measurement type (See Hardware Configuration Page) is either of the aeroderivative selections.
Primary Path
65536 - - - -
32768 12800 14400 8000 4800
16384 6400 7200 4000 2400
8192 3200 3600 2000 1200
4096 1600 1800 1000 600
2048 800 900 500 300
1024 400 450 250 150
512 200 225 125 75
256 - - - -
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