Rockwell Automation 1790P-4R0 CompactBlock LDX I/O RTD/Resistance Input Module - Manual (Page 36)

Publication 1790-UM002A-EN-P
3-6 Module Data, Status, and Channel Configuration for DeviceNet
Channel Cutoff
Frequency The channel cutoff frequency (-3 dB) is the point on the input channel
frequency response curve where frequency components of the input
signal are passed with 3 dB of attenuation. The following table shows
cutoff frequencies for the supported filters.
All frequency components at or below the cutoff frequency are passed by
the digital filter with less than 3 dB of attenuation. All frequency
components above the cutoff frequency are increasingly attenuated, as
shown in the graphs below for several of the input filter frequencies.
Table 3.6 Filter Frequency vs. Channel Cutoff Frequency
Filter Frequency Channel Cutoff Frequency
10 Hz 2.62 Hz
25 Hz 6.55 Hz
50 Hz 13.1 Hz
60 Hz 15.7 Hz
100 Hz 26.2 Hz
250 Hz 65.5 Hz
500 Hz 131 Hz
NOTE
Channel cutoff frequency should not be confused with
channel update time. The cutoff frequency simply
determines how the digital filter attenuates frequency
components of the input signal.