Rockwell-automation 1769-HSC Compact High Speed Counter Module Manual de usuario Pagina 127

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Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 127
Specifications Appendix A
Rate Accuracy
The following graph shows rate error at various frequencies. The following trends
can assist you in reading the graph:
Of the lines that rise at low frequencies, the left-most is a 10-second update
time (CtrnCyclicRateUpdateTime = 10000).
The right-most of these lines is a 1-millisecond update time
(CtrnCyclicRateUpdateTime = 1).
The line that rises at high frequencies illustrates Ctr[n].PulseInterval.
Figure 21 - Rate Errors Comparison
0%
1%
2%
3%
4%
5%
6%
7%
8%
9%
10%
10 100 1,000 10,000 100,000
1
,
000
,
0
1
5
10
50
100
500
1000
10000
CPI
Frequency (Hz)
Error (Percent)
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