Beckhoff EPP9022-0060, Manual

Page: 30 / 56

Commissioning and configuration
EPP9022-0060 30 Version: 1.3
5.2.2 Filter
The measured value of each input channel can be filtered with a digital filter.
Enable filter
NOTE
Measured value jumps when enabling or disabling filters
When filters are enabled or disabled, short-term measured value jumps can occur in the process data that
do not correspond to the physical values.
You can enable the filter individually for each input channel. All filters are disabled in the factory setting.
Enable the filters by setting the following CoE parameters to TRUE:
Input channel CoE parameters for enabling the filter
1 Control voltage U
S
8000:01 "Enable filter" [
}
40]
2 Peripheral voltage U
P
8010:01 "Enable filter" [
}
41]
Select filter characteristic
You can select the filter characteristic individually for each input. Factory setting: "50 Hz FIR".
Input channel CoE parameter for selecting the filter characteristic
1 Control voltage U
S
8000:19 "Filter characteristic" [
}
40]
2 Peripheral voltage U
P
8010:19 "Filter characteristic" [ } 41]
There is a choice of two filter types:
FIR filter
The filter works as a notch filter and determines the conversion time of the module. The higher the filter
frequency, the faster the conversion time. A 50 Hz and a 60 Hz filter are available.
Notch filter means that the filter has zeros (notches) in the frequency response at the filter frequency and
multiples thereof, i.e. it attenuates the amplitude at these frequencies.
The FIR filter operates as a non-recursive filter.
IIR filter
The filter with IIR characteristics is a discrete time, linear, time invariant filter that can be set to eight levels
(level 1 = weak recursive filter, up to level 8 = strong recursive filter)
The IIR can be understood to be a moving average value calculation after a low-pass filter.