crio 9024 can not general higher than 10hz pwm

[galaxy4444]

I use crio-9024 to general pwm signal.When the frequence is low(actually less than 10hz), it works fine. But, when the frequence is higher than 10hz, the pwm signal will be not accurracy. Worse more, when I set the frequence to 100hz, it will generate 10 hz signal.Hope somebody can help me!

[galaxy4444]

this is the program 

[altenbach]

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@galaxy4444 wrote:

this is the program 

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No, this is just a picture.

[galaxy4444]

Yes,it is a picture.Here is the code in the attachment.Would you give me some advice?

[MarkCG]

see if your digital output card supports PWM specialty digital mode, you dont need to roll your own PWM. Also the timed loop should be synchronized to scan engine

[Kyle_Jiang]

hi galaxy4444, I have read the program you published on the forum. The method you generate the PWM is not the optimal way. You may refer to the example in the attachment.

[Kyle_Jiang]

Program Files (x86)\National Instruments\LabVIEW 2014\examples\CompactRIO\FPGA Fundamentals\Counters\PWM Generation

[galaxy4444]

Did you mean this example. I use labview2011, so I find this file in this directory. I try to add this vi to my project. But when I run this program, the wave it generates is unstable. Worse more, the parameter is also incorrect. Is it because my project is in scan mode not fpga mode? So appreciate for everyone's help!