Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 331
CIP Objects Appendix A
Reading TWF and FFT Data
The 1444 Dynamic Measurement Module can serve spectra (FFT) and time
waveform (TWF) data from live, buffered, and captured (saved) data sources.
While there are small differences in how the data is specified, how it is read is
the same regardless of its source. The following objects allow reading FFT and
TWF data.
See the individual object descriptions for details on how to specify data
requests.
Object Function Description
Dynamix Data Manager Read live data Returns the TWF or FFT processed from the current “live”
data.
Read trend data Returns either the most recent TWF or FFT, or all TWFs or
FFTs, from either the High or Low-Resolution Trend buffers.
Read alarm data Returns either the most recent TWF or FFT, or all TWFs or
FFTs, from either the High or Low-Resolution Alarm
buffers.
Dynamix Transient Data
Manager
Read captured transient
data
Returns the contents of the specified transient buffer.
Dynamix Normal CM Data Read live data Returns the TWF or FFT processed from the current “live”
data.
Dynamix Advanced CM
Data
Read demand data Returns TWF or FFT data that is processed from the
Demand buffer.
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