[Caroline2399]

I'm not sure as to why that code isn't working, but here are my suggestions for troubleshooting it.

My first suggestion for this would be to wire the error from the drive VI to the Delay and Feed VI in the same frame.

I noticed that you had the constant "N" value for the first frame defined outside of the sequential loop, I don't know why it wouldn't work where it is currently, but maybe try moving it inside there.

Also, maybe try turning the auto-indexing off for the tunnels outputting and inputting the Watchdog Reference and the Drive Ref. And, try for the second "Delay and Feed" VI taking the reference from the output of the first one. Again, I don't know why this would make a difference, but LabView can be odd like that sometimes.

I hope this is able to help, if you still have the same issues, let me know, and I'll see if I can come up with any other methods you could use to troubleshoot the code.