PID and series

Gurus,

I try to use Labview PID control on a piece of hardware. I use the model single-loop PID. Instead of reading in tension, I read a value of a serial port. However, I can't serial port read software to work. I section reading inside the while loop of the PID VI. I have followed the issue down to a timed loop that counts the number of bytes to the serial port. For some reason, the timed loop is simply not triggering

If I slightly separated from the running code to read the serial port that performs the same function, all is well. I tried to copy the timed loop from one VI to another (rename), no joy. Re-written to remove the first order idiocy, no joy. Someone at - it ideas?

Attached are the 3 screws I use (I cut it down to simplicity). Loop simple SNAQ PID.vi is the principal, the question is on frame 1 of the reader.vi 4300. What I don't understand is that if I use the port configuration and 4300 drive after a re-start without having to open the SNAQ PID.vi loop. they work!

Thanks in advance

Thanks for the reply, I'll look tomorrow for 'tips tidyness' on the screws.

After all to uninstall older versions of Labview, deleting the files from the control PC and rewrite with all the outputs wired error upwards, I discovered the problem. You cannot use a timed within an evanescent VI loop structure. The PID screws are all the time-critical. I lowered the priority high-grade properties VI and everything worked. Who took all day! I was going to post tomorrow.

I tried your suggestion of wiring of the reference in the code yesterday. It does not have a difference, although I suspect that it is more effective this way to program.

As for the timed loop... The courage of the VI is several years old. When I upgraded my version of Labview, I tried the new features. At the time, call loops was one of them.

Thanks again, I will watch your screws

Paul

Tags: NI Hardware

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