pid control coupled tank

[azlan_mhs]

Hye all......

i  want to develop graphical user interfaces PID Controller to control level height  and interfaces with coupled tank apparatus using NI-DAQ USB 6008......

i've found some good examples and i attached here.......i've already edit and there is 1 error to be solve.......

my problem is the simulation can't be run because there is some error

~SubVi 'IO Duncan .vi :SubVI is missing.......

can you help me on how to edit these problem???? as long as the simulation can be simulate..........

thanx 4ur help......

regards.....

azlan......

[DavidMaidman · Accepted solution]

It sounds like that when you downloaded/saved the example code you have been working on you didn't download the SubVi 'IO Duncan .vi  - so LabVIEW can not find it.

In the same way you have not included the PID subvi you are using so when I open your VI I get an error saying that it is missing.