Additional Information
The digital filter processing frequency can be calculated as follows:
• Ch£
Digital Filter Processing Frequency [kHz] = (1 ÷ Ch£ Digital Filter Processing Period
[µs]) × 1,000
How to Check the Processing Period
You can check the Digital Filter Processing Period value on the Sampling Settings and Digital Filter
Settings Tab Page of the Support Software. Refer to 8-5-4
Checking the Digital Filter Settings on
page 8 - 28 for details on the Sampling Settings and Digital Filter Settings Tab Page.
Calculation Examples for the Digital Filter Processing Period
Calculation Example 1
When the task period of an assigned periodic task is set to 1 ms and the number of samplings is
set to 100, the sampling period is 10 µs. At this time, the Number of Digital Filter Processing Oper-
ations is as follows:
• Ch£ Number of Digital Filter Processing Operations = 10 µs ÷ 5 µs = 2 times
Hence, the Digital Filter Processing Period is as follows:
• Ch£ Digital Filter Processing Period = 10 µs ÷ 2 times = 5 µs
Calculation Example 2
When the task period of an assigned periodic task is set to 125 µs and the number of samplings is
set to 10, the sampling period is 12.5 µs.
At this time, the Number of Digital Filter Processing Operations is as follows:
• Ch£ Number of Digital Filter Processing Operations = 12.5 µs ÷ 5 µs = 2 times
Hence, the Digital Filter Processing Period is as follows:
• Ch£ Digital Filter Processing Period = 12.5 µs ÷ 2 times = 6.25 µs
Digital Low-pass Filter
The digital low-pass filter attenuates input signals by -3 dB with the set cutoff frequency.
Cutoff Frequency Setting
Set the cutoff frequency in the Unit operation settings. The settings are shown in the following ta-
ble.
8 Functions
8 - 20
NX-series Analog I/O Units User’s Manual for High-speed Analog Input Units (W592)
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