Fig. 170 Filter Structure - Beckhoff EL3632 Documentation

Filter
Each channel has a parameterizable 5th order filter with Butterworth characteristic with upstream and
downstream anti-aliasing filters that are parameterized automatically. The whole filter stage is based on
hardware. There are no software filters (apart from the active offset setting). When the limit frequency is set
to 10 Hz (0), an additional amplification factor 20 is activated automatically.
Fig. 170: Filter structure
The analog input filters can be set via the CoE objects 0x80n0:15 [} 132] (channel 1/2). It is not possible to
switch off the filters.
The calculation of the average value is configurable:
0: 10 Hz, Gain 20
1: 100 Hz
2: 500 Hz
3: 1000 Hz
4: 5000 Hz
5: 10000 Hz
6: 25000 Hz
7: 2000 Hz (from firmware [} 196] 11)
Setting the filters
The filters must be configured separately for both channels.
Setting the filters will interrupt the conversion of new data for a short time.
Active offset setting
The function "Active offset adjustment" calculates the long-term average of the values. The calculated offset
value is used instead of the set "user" and "vendor calibration offset" entries. At least one function, "user" or
"vendor calibration", must be activated
The calculation of the average value is configurable:
Level 1: b = 1/4096
Level 2: b = 1/8192
Level 3: b = 1/16384
Level 4: b = 1/32768
Level 5: b = 1/65536
Level 6: b = 1/131072 (128 k)
Level 7: b = 1/262144 (256 k)
Level 8: b = 1/524288 (512 k).
Calibration
The input values can be calibrated by means of manufacturer or user values:
EL3632 Version: 2.8
Commissioning
129