Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 147)

Technical data of CPU 31xC
6.6 Technical data of the integrated I/O
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
6-37
In the two graphics below we illustrate how the 50 Hz and 60 Hz interference suppression
work
1.05 ms
Value
1
Value
2
Value
3
. . .
Value
19
Value
20
Value
1
Value
2
Value
3
. . .
Value
19
Value
20
1.05 ms 1.05 ms 1.05 ms 1.05 ms
1.05 ms 1.05 ms 1.05 ms 1.05 ms 1.05 ms
Example of a 50-Hz parasitic frequency suppression (integration time corresponds to 20 ms)
1 averaged measured value
1 averaged measured value
Cycle 1
Cycle 2
Figure 6-5 50 Hz interference suppression