Siemens S7-300 appendix Hz interference suppression

Technical data of CPU 31xC 6.6 Technical data of the integrated I/O

In the two graphics below we illustrate how the 50 Hz and 60 Hz interference suppression work

Example of a 50-Hz parasitic frequency suppression (integration time corresponds to 20 ms)

1.05 ms	1.05 ms	1.05 ms	1.05 ms	1.05 ms
			. . .
Cycle 1
Value	Value	Value	Value	Value
1	2	3	19	20

1 averaged measured value

1.05 ms	1.05 ms	1.05 ms	1.05 ms	1.05 ms
			. . .
Cycle 2
Value	Value	Value	Value	Value
1	2	3	19	20

1 averaged measured value

Figure 6-5 50 Hz interference suppression

CPU 31xC and CPU 31x, Technical data	6-37
Manual, Edition 08/2004, A5E00105475-05