Hello We have a pulse with a frequency of 5 kHz. That this pulse you have is a pulse width. We want to calculate the pulse width and be aware of duty cycle of a pulse. I checked the manuals, but nothing was written about it. Thanks for giving me a solution. In general, we want to calculate the duty cycle input pulse

thank you

ehsanghapandaran

Hello We have a pulse with a frequency of 5 kHz. That this pulse you have is a pulse width. We want to calculate the pulse width and be aware of duty cycle of a pulse. I checked the manuals, but nothing was written about it. Thanks for giving me a solution. In general, we want to calculate the duty cycle input pulse

thank you

Hello.

Thank you for stating your problem clearly now. In the future.. please do not create multiple topics in the forum; it works against the efforts of our volunteers.

I am assuming a one pulse signal.
The abilities on the HSC does not have what you need. 

The closest programmed solution would be to use hardware interrupts. The time period between the positive edges and negative edges of the pulse can be measured. This is tricky to do with the instruction set on the S7-1200. Worse the result is not reliable. I do not recommend this on the S7-1200 platform.

A solution for the S7-1200 is to use an external circuit. A low pass filter will be able to 'covert' the variable duty pulse to an analog signal. The filter can be an RC filter or an opamp circuit. The analog can be read by the onboard 10bit analog input.

If this solution is not acceptable to you and your colleague, consider creating a support request to talk to the Siemens Support team. Use the "Support Request" link.

ehsanghapandaran

Thank you for your response .
One of my colleagues did this with the S7-1200 and it had a good result, so we also used this CPU.

Off-topic        (tone = teacher)

Engineering is not just about things.
Much of the equation is the human factor.

Consider the above quote.
"did this"  may mean:

a) The S7-1200 was used for a similar project,
but did not have the duty cycle measurement.

b) The S7-1200 was used to measure the duty cycle measurement.

My home language is not English. My cultural background will have me understand you mean (b). That would make me angry: this is important fact to mention + you should talk to your colleague. Knowing that someone solved this problem can lead us into avenues to investigate how it was done.

Please consider then to write as if you are a law student. Leave as little doubt as what are saying. Our life experiences are very different so we can only walk a path of understanding if the path is clear of rubble.

Thank you for your help.
(B)
I am not English speaking either

thank you