Thank you.
The ultimate goal is to control heaters by using the Write 1 point to Digital Line. I have used a Case Structure within a While Loop that has a Not(to alternate between true and false).
At first I put 4 individual "Write 1 pt Dig Line.vi" then I eliminated the redundant parts. There still is a problem that the fourth and sometimes the third relay stays on (past that Off cycle) as if the time for that frame was over before the execution order was finished. I did put a timer in my While Loop to slow it down to a 1 second cycle but the results did not change. The Timer in the Case Structures was also increased but nothing got them all working together, all the time.
It might take a graph to figure out the pattern.
RL