Siemens SIMATIC S7-1500 Manual page 30

Parameters/address space
4.3 Declaration of parameters
Interference frequency suppression
At analog input modules, this suppresses interference caused by the frequency of AC mains.
The frequency of AC network may corrupt measurements, particularly in the low voltage
ranges, and when thermocouples are being used. For this parameter, the user defines the
mains frequency prevailing on his system.
Smoothing
The individual measured values are smoothed using filtering. The smoothing can be set in
4 levels.
Smoothing time = number of module cycles (k) x cycle time of the module.
The following figure shows the number of module cycles after which the smoothed analog
value is almost 100%, depending on the set smoothing. It is valid for each signal change at
the analog input.
①
②
③
④
Figure 4-3
30
None (k = 1)
Weak (k = 4)
Medium (k = 16)
Strong (k = 32)
Smoothing with AI 4xU/I/RTD/TC ST
Analog Input Module AI 4xU/I/RTD/TC ST (6ES7531-7QD00-0AB0)
Manual, 09/2016, A5E32366209-AC