Configuration
EP31xx82 Version: 2.4
If the frame jitter is too large, it is possible that data may be collected twice or there may be interruptions in
the transmission. In that case the jitter is to be reduced through TwinCAT system measures or a slower cycle
time is to be chosen.
Filter operation (FIR and IIR), index 0x80n0:06, 0x80n0:15 [
}
124]
The EP31xx modules incorporate a digital filter which, depending on its settings, can adopt the
characteristics of a Finite Impulse Response filter (an FIR filter), or an Infinite Impulse Response filter (an IIR
filter). The filter is deactivated by default. Please observe the following note regarding activation with index
0x8000:06 [}124].
Activation of the filter (index 0x8000: 06), setting of the filter properties (index
0x8000:15)
The filter frequencies are set centrally for all channels of the EP3xxx modules via index 0x8000:15
(channel 1). The corresponding indices 0x80n0:15 of the other channels have no parameterization
function.
FIR filter
The filter works as a notch filter and determines the conversion time of the module. It is parameterized via
the index 0x8000:15. The higher the filter frequency, the faster the conversion time. A 50Hz and a 60Hz
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.
Fig.63: typical attenuation curve of notch filter at 50 Hz
Filter data FIR filter (1- to 4-channel modules)
Filter Attenuation Limit frequency (-3 dB) Conversion time
50Hz FIR >50dB 22Hz 625µs
60Hz FIR >45dB 26Hz 521µs
To Next Page
Loading...
Need help?
General