Why do I receive Error Code -50000?

[bohellman]

I have a M-serie 6221 card where I use the two analog output, DC voltage out. (Labview 7.0 running on a Pentium 4 HT processor and Win XP SP2).

I have two processes (independant dynamic VI's) for analog voltage output.
Process 0 use AO channel 0 and Process 1 use AO channel 1 on the 6221 card.
Both processes use the simple DAQ-Write 1 Chl 1 Smpl VI and with an update rate of only 4 Hertz.
I have made shure that the data input is between +- 10V using a coerce function.

Occationaly (sometimes hours between fails) I receive Error Code -50000 (=conflicting parameters) after one of the DAQ-Write 1 Chl 1 Smpl VI .

Why?
Can it be a problem with multi-threading?

Regards

Bo Hellman
Biotage Sweden AB

[jasonv]

bohellman,

When you are using the DAQmx Write VI, are you setting the auto start input to false, or have you left it at its default of true. One thing I would recommend trying is to explicity start the task and set auto start to false, and see if this makes any difference. If you are writing within a loop, then this can also make your application run more efficiently.

To determine if the problem was a multithreading issue, you could disable multithreading within LabVIEW (Tools-Options, select Performance and Disk tab).

If you still have trouble, could you post the problematic portion of your VI that is causing the error?

Good luck,

Jason