Basler Electric BE1-81O/U - Manual (Page 14)

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However, if the sensed frequency equals or exceeds the 80 hertz maximum frequency limit (zero-cross
pulses interrupt the counts) for three consecutive cycles, the maximum period difference logic is
bypassed. The measured-frequency converter then computes the frequency at this maximum frequency
limit. The definite time delay is not affected by the frequency limit being exceeded.
Figure 4. BE1-81O/U Functional Block Diagram
Functional Description BE1-81O/U