Parameters/address space
4.8 Quadrature evaluation of differential signals
ET 200SP F-TM Count 1x1Vpp sin/cos HF (6ES7136-6CB00-0CA0)
Equipment Manual, V1.0, 01/2021, A5E47073911-AA
49
The figure below shows an example for continuing the counting process after an overflow
and setting the counter to the opposite counting limit:
4.8 Quadrature evaluation of differential signals
With quadrature evaluation, the A and B signals are shifted by 90 degrees in relation to each
other. When the A signal is leading, the movement is in the forward direction. When the B
signal is leading, the movement is in the reverse direction.
Counting occurs at each "zero-crossing" of the A and B signals. As a result, each complete
waveform has a total effect of 4 counts. For example, given a 200 kHz frequency, 800K
counts per second can be achieved. These relationships are illustrated in the figure below:
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