Allen-Bradley 1444-TSCX02-02RB User Manual page 469

Table 206 - CM Record Request Parameters (2)
0 BufferSelect
2 RequestedCount
4 SessionInstance
5 ChannelSelect
6 SpecialRequest
7 Pad
8 PacketCountDown
Table 207 - SpecialRequest Description - CM Record Request Parameters (2)
Bit
0 SR_MAG_PHASE
1 SR_LIVE
2 Reserved
3 SR_FILTER_LO
4 SR_FILTER_HI
5 SR_EXTENDED
IMPORTANT
(1) The FMAX and FFT Lines presented in the AOP assume that bits 3, 4 and 5 are set. If other selections are made, then the FMAX or the number of FFT lines of a downloaded FFT does not always reflect
that presented in the AOP.
(2) When automatically deciding the factor to apply to decimated or synchronously resampled data the firmware applies the SR_FILTER_LO (37.5%) factor when the -24 dB/octave filter is applied, and
the SR_FILTER_HI (62.5%) factor with the -48 dB/octave or the -60 dB/octave filters are applied.
Data that is decimated on the Alternate Path always applies the -48 dB/octave filter. The applied filter on the primary path is the -24 dB/octave filter except when either of the Aeroderivative
Measurement Types are selected, in which case it applies the -60 dB/octave filter.
The host sends the following CM Record Request Parameters as part of an
0x4C service request.
INT Specify the buffer to retrieve the data from: eFFT (2), eTWF (3), or eTACHO (4).
The BufferSelect does not change during a session.
UINT Set RequestedCount = 1
The RequestedCount does not change during a session.
USINT The SessionInstance is initially specified as 0, but on subsequent calls the SessionInstance
returned in CM Record Response must be passed here.
BYTE 4 bits indicating the source channel. The ChannelSelect does not change during a session.
BYTE See Table 207 on page 469
BYTE Used to align data to a 32 bit boundary.
DWORD The PacketCountDown is initially specified as 0, but on subsequent calls the
PacketCountDown returned in the CM Record Response must be passed here.
Description
Set to request phase (see Phase Data on page
magnitude data is returned.
Set to request 'live' data collection rather than receive the most recent data from scheduled (Trend) data
acquisition.
Set bit to specify that if samples are decimated, either by specifying a lower FMAX
resampling, then 37.5% of the unfiltered FFT lines are returned.
If bits 3 and 4 are both set, then the firmware automatically determines the number of returned FFT lines
based on applied filtering.
Set bit to specify that if samples are decimated, either by specifying a lower FMAX
resampling, then 62.5% of the unfiltered FFT lines are returned.
If bits 3 and 4 are both set, then the firmware automatically determines the number of returned FFT lines
(2)
based on applied filtering
Set bit to specify that if samples are not decimated or synchronously resampled that 112.5% of the unfiltered
FFT lines are returned.
When not set, 100% of FFT lines are returned for samples that are not decimated nor synchronously sampled.
Recommended use is to set bits 3, 4 and 5. This setting makes sure that in all cases the maximum number of
lines are returned that are, in all cases, free of any filter attenuation or potential aliasing effects.
Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
334) and magnitude data from an FFT buffer, otherwise just
(2)
.
CIP Objects Appendix A
(1)
or by synchronous
(1)
or by synchronous
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