Beckhoff EtherCAT EP3752-0000, Documentation

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Commissioning/Configuration
EP3752-0000 27 Version: 1.4
5.2.1.3 Filter
Filter mode (FIR and IIR)
The EP3752-0000 is equipped with digital filters which, depending on their settings, can adopt the
characteristics of a
F inite I mpulse R esponse filter ( FIR filter ), or of an I nfinite I mpulse R esponse filter ( IIR-
Filter ). The filters are deactivated by default. The activation takes place
• individually for each channel via the indices 0x80n0:06 [ } 38] from Firmware 02.
• centrally via the 1
st
channel (index 0x8000:06 [
}
38] ) with Firmware 01.
The filter characteristic is selected individually for each channel via the indices 0x80n0:15 "Filter Settings":
FIR
The mean value of the last 32 measurements is calculated. The internal sampling rate (time interval between
the individual measured values) can be parameterized via index 0xF800:0D "Filter sampling rate".
IIR1…8
The filter with IIR characteristic can be set to one of 8 levels. The higher the level, the higher the attenuation
of the present signal by the filter. The internal sampling rate can be set via index 0xF800:0D "Filter sampling
rate" (unlike other analog boxes in which a fixed cycle time of 1 ms is specified).
Setting of the internal sampling rate via index 0xF800:0D
Fig. 7: Setting of the internal sampling rate (index 0xF8000:0D)
The internal sampling rate with filters switched on is set via the index 0xF800:0D. On delivery this is set to
1000 Hz.
Changing the update rate at 2000 Hz and 5000 Hz
The resolution is reduced to 8-bit if the rate is increased to 2500 Hz or 5000 Hz. This is necessary
due to the sensors used.