Command requires GPIB Controller to be Controller in Charge on dequeue element

I have some funky stuff going on in the attached VI. What the VI does is simply to log data to a text file. It is built up as a state machine. This VI's Create state is called from a mainVI (with the help of named queues). I get more than one error and it seems completely random.The error usually occurs if I stop the mainVI, then starts it again. So the second (or following) times the DP VI is called, I get random errors such as the two below:
Error 1 occurred at Dequeue Element in DP.vi->PSS.vi
Possible reason(s):
LabVIEW: An input parameter is invalid.
NI-488: Command requires GPIB Controller to be Controller in Charge.
Error 1 occurred at Close File in DP.vi->PSS.vi
Possible reason(s):
LabVIEW: An input parameter is invalid.
NI-488: Command requires GPIB Controller to be Controller in Charge.
Why is this? I don't even have a GPIB controller?
Solved!
Go to Solution.
Attachments:
DP.vi ‏61 KB

Siniz wrote:
blawson, I think you found the error!
So shift registers only gets uninitialized again if I close the actual VI, and not when I start executing it again? So in reality, they actually behave like real shift registers? I found two solutions to this problem.
1) To initialize the error shift register with an empty error constant.
2) To remove the wire from the shift register to the Write to Text File. This works since I always call the Create state first.
Which one would you recommend?
Also, what is the reason to keep the typedef strict? I have seen non-strict in other code.
Generally you should always explicitly initialize your shift registers unless you want to retain the values from one execution to the next. This is required for Action Engines but in most other cases you should use initialized shift registers to avoid side effects like you encountered in this application.
Mark Yedinak
"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
Wreck of the Edmund Fitzgerald - Gordon Lightfoot

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