[Davx]

Correct, you (almost) never want to use a while loop in your code, since that's not how the logic is setup. The program is based on each loop getting new data from the OI at the beginning, and setting the outputs at the END, and ONLY at the end. (Yes you could call putdata yourself, but lets not go there) A while loop will do nothing but lock up your program and eventually the watchdog timer will shut off the User proc and you'll get a code error indicator.