Beckhoff EL3182 Documentation page 109

Fig. 109: Attenuation curve notch.filter at 50 Hz
Filter data for FIR filter (1 to 4-channel terminals)
Filter Attenuation
50 Hz FIR > 50 dB
60 Hz FIR > 45 dB
IIR filter
The filter with IIR characteristic is a time-discrete, linear, time-invariant low-pass filter of 1st order (-20dB/
decade), which can be adjusted in 8 levels, i.e. cut-off frequencies. (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.
Through the synchronization mode FreeRun the IIR filter operates with an internal cycle time of 180 µs (1 or
2 channels) or 500 µs (4 channels).
IIR filter EL31x1, EL31x2, sampling time 180 µs
Limit frequency (-3 dB)
IIR 1 1 kHz
IIR 2 500 Hz
IIR 3 285 Hz
IIR 4 142 Hz
IIR 5 66 Hz
IIR 6 33 Hz
IIR 7 17 Hz
IIR 8 8.2 Hz
EL3182
Limit frequency (-3 dB)
22 Hz
26 Hz
EL31x4, sampling time 500 µs
Limit frequency (-3 dB)
400 Hz
220 Hz
100 Hz
50 Hz
24 Hz
12 Hz
6.2 Hz
3.0 Hz
Version: 1.2
Commissioning
Conversion time
625 µs
521 µs
109