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frequency measurment

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I am new in plc and visilogic and i need some help,

I need to measure the frequency of a square wave , I tried to use HSC Frequency Measurement FB , but it does not work.

( my square wave freq is slow... about 2Hz)

I connected my signal to I0 of a V200.

Can someone please tell me what should I do to measure the freq of that signal?

Do you have any example?

I am using V570 and V200-18-E2b

By the way:

My square wave should be 24v?



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