The Frequency meter type measures an event frequency in Hz.
The Frequency meter type calculates the number of pulses in time intervals of 1 s. An updated value in Hz is available for each time base value (10, 100, or 1000 ms).
When there is a variation in the frequency, the value restoration time is 1 s with a value precision of 1 Hz.
The maximum frequency that the module can measure on the A input is 200 kHz. Beyond 200 kHz, the counting register value may decrease until it reaches 0.
The maximum duty cycle at 200 kHz is 55%.
This diagram provides an overview of the Frequency meter principle:
