Allen-Bradley 1444-TSCX02-02RB User Manual page 405

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