Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 393
CIP Objects Appendix A
The Record Type Structures are as follows.
High and Low-Resolution Trend (eHIGH_RES_TREND,
eLOW_RES_TREND, eHIGH_RES_ALARM, eLOW_RES_ALARM)
FFT (eFFT, eFFT_ALARM)
If the FFT is a synchronous measurement, then the RPM value is also provided
in the SamplePeriodInSecs parameter. In that case, the two RPM values are
identical.
Table 120 - Record Type Structures
Byte Offset
Within Structure
Structure Member Data Type Description
0 TimestampNanoSec UDINT Subsecond accuracy.
4 TimestampSec UDINT Seconds since 1970.
8 Reserved DWORD
12 Reserved DWORD
16 Params0 DWORD Set bits indicate which parameters are included in the data array. The values in DataArray
are in the order of the set bits. Value is the same as the configuration tag
Trend.Stati cParams0…3.
20 Params1 DWORD
24 Params2 DWORD
28 Params3 DWORD
32 ByteCount UDINT The number of bytes in the data array. This is equal to the number of bits set in the
parameters Params0…Params3 (x4).
36 DataArray REAL The array of parameters included in the trend data set. Is a packed array where the first value
is the first set bit, the second value is the next set bit, and so on.
Table 121 - Record Type Structures
Byte Offset Within
Structure
Structure Member Data Type Description
0 TimestampNanoSec UDINT Subsecond accuracy
4 TimestampSec UDINT Seconds since 1970
8 SamplePeriodInSecs REAL Time period between samples or speed and number of samples per
revolution
12 identifier* DWORD Data source, mode, tacho source, and measurement units
16 ucDataSelect BYTE If Bit 0 is set, phase array follows the mag array in the LineArray. Otherwise,
just the magnitude array.
Bits 1 and 2 indicate FFT scaling:
0 Peak, 1 Peak to Peak, 2 RMS
17 ucSpeedByte0 BYTE RPM value of the referenced speed source for the FFT data.
Actual RPM = Value/100
Value that is provided is a 24 bit (3 byte) integer.
First (least significant) byte, bits 0…7.
18 ucSpeedByte1 BYTE Second byte, bits 8…15
19 ucSpeedByte2 BYTE Last byte, bits 16…23
20 ByteCount UDINT The size of the following array in bytes.
24 LineArray REAL The array of FFT line amplitude data.
To Next Page
Loading...
Need help?
General