Frequency Meter Value
Original instructions
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Precautions
WARNING
UNEXPECTED FREQUENCY VALUE
Before using frequency values in the application:
  • Check that the sensors are installed according to the supplier recommendations.
  • Confirm that the sensors are connected to the terminal block according to the wiring rules.
  • Confirm that the signal filtering function is correctly configured.
Failure to follow these instructions can result in death, serious injury, or equipment damage.
Sampling Period Configuration
The parameter Sampling Factor defines the sampling period value.
The sampling period (1 / sampling rate) can be configured to 10...200 ms in steps of 10 ms.
By default, the sampling period value is 10 ms (sampling rate = 100 Hz).
Adaptive Integration Period
For each sampling period value, the module considers the best integration period to calculate the frequency value with the best accuracy.
NOTE: The integration period calculated contains at least one pulse.
The figure below shows how the module considers the best Integration period depending on frequencies of the input signals: 
1, 2 and 3
Input signal for various frequencies 
4
Sampling periods 
5
Best integration periods corresponding to the input frequency.
NOTE:
  • The integration period is close to the last sampling period when the frequency of the input signal is greater than the sampling rate.
  • The integration period is close to the last input signal when the frequency of the input signal is less than the sampling rate.
The maximum value for the integration period does not exceed 1 s and the minimum measurable frequency is 1 HZ.
Frequency Value
Frequency value = N pulses / integration period * 10E6 (pulses per 1000 seconds)