Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 405
CIP Objects Appendix A
See Reading TWF Data on page 332 for details on how to calculate the TWF
from the read data.
Table 133 - Waveform (eTWF_TDx)
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 RelativeTime UDINT A 24-bit (micro-second) counter-value for finely aligning data.
See Reading Continuous Time Waveforms
on page 329 for
information on using this parameter.
20 ByteCount UDINT The size of the following array in bytes.
24 SampleArray REAL The array of waveform data values (samples).
Table 134 - Tacho (eTACHO_TDx)
Byte
Offset
Within
Structure
Structure Member Data Type Description
0 TimestampNanoSec UDINT Subsecond accuracy.
4 TimestampSec UDINT Seconds since 1970.
8Reserved REAL
12 Reserved DWORD
16 Reserved UDINT
20 ByteCount UDINT The size of the following array in bytes.
24 TimingArray UDINT The array of tacho time values (24 bit, micro-second
counter).
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