Command PID of power

Note: I know that this post can be considered off-topic, but I think my problem is with how I'm trying to control my instrument (not the PID controller); That's why I posted my question here. Please correct me if I'm wrong.

Seen: I have a power supply programmable dual channel, a wheel and a PID controller.

Find: The encoder feedback, I would like to use the PID controller to control the outputs on my power supply.

My solution
Using the VI below, I can read the encoder and adjust the power supply without a regulator PID. The left loop reads the encoder data, and the loop on the right allows me to "manually" resolve tensions on the channel 1 and channel 2. Specifically, a structure of the event inside the loop on the right send recent tensions 'channel' (as I entered in the respective controls) power supply.

My problem
However, the law while loop is not "react" when I can replace this "manual" voltage control a PID controller. The power supply simply does nothing even though the PID is indicative of the power to do something.

Attempt to correct
Mode "highlight execution", I noticed my left loop would complete many iterations, but data in the loop on the right had to run only one time - and even in this case data arrested when he reached the structure of the event.

Questions

  1. My PID control loop does not work because the PID loop (left) runs too fast compared to my power supply loop?

  2. What would you recommend? Filers?

  3. (Slightly unrelated) How should I wait the last strains of my diet?
    The two blocs 'read out' in the loop of power should allow me to display the real tension of a channel. However, these data are always a 'step' behind the actual reading.
    For example, I put V1 = 12V. Food reacts and displays 11.998V on its LCD screen. However, my LV code displays 0V (or any busy V1 value). If I change again V1, say V1 = 7.9V, then the power displays 7.989V but the code LV displays 11.998V. What I am doing wrong?
    Writes that if I set V1 and then set V2, my LV code displays the value of the V1 correct but not the last value of V2.

Well, the first problem is obvious.  You initialize the power whenever the event occurs.  (DON ' T DO THAT! ")

Initiallize ONCE

Loop ON

Read the answer

Feedback monitor

Adjust the stimulation

until the output is requested

Output control loop

Close resources ONCE

Tags: NI Hardware

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