What is the problem with this PID regulation?

[rinpocse91]

Hi,

In the chart, i see interesting lines ,but i would like to see "normal" signals. Maybe i set up something wrong .Could u help me?

thanks! 

[altenbach]

We have absolutely no idea what "interesting" and "normal" means to you. Please be more specific!

We also don't know how your hardware is setup.

Can you show us a picture or attach some typical data?

[rinpocse91]

I attached the program. I mean, i would like to see sinus signal, and continuous signals, not piece of signals. Now i see this:

[rinpocse91]

There is no harware, its just a simulated ddevice.

[crossrulz]

Didn't we explain that in your other thread? http://forums.ni.com/t5/LabVIEW/What-is-this-red-dot-How-can-i-solve-it/m-p/3129656#M899422

You are reading many samples, but only 1 samplegoes to the chart due to how you have it set up.

[ben64]

And since the graph is the scaled output of the DAQ Assistant it has nothing to do with PID regulation.

Ben64

[rinpocse91]

Sorry what do you mean? This pid regulation does not work?

[crossrulz]

---

@rinpocse91 wrote:

Sorry what do you mean? This pid regulation does not work?

---

Go back to your other thead.  I told you how to fix it.

[nathand]

---

@rinpocse91 wrote:

Sorry what do you mean? This pid regulation does not work?

---

If you want to see the effects of the PID controller, you should plot the controller output. Right now, your chart shows nothing about the PID, because you are reading a simulated signal, and the simulated signal is always a sine wave. Writing to the simulated analog output has no effect. Others have already explained why your sine wave is broken into chunks instead of being a smooth curve. In an earlier post you showed an image where the sine wave is smooth, so you should compare the new configuration to that one to understand what you changed.

There's no need for separate threads titled "Why does not work this PID regulation?" and "What is the problem with this PID regulation?" when you are asking about the same system in both cases. Please stick to a single topic and keep all the related messages together.