What does error code -50103 (PALResourceReserved) mean?

[chandan]

On a PCI-6221 card, what does the error code -50103 (NIDAQmxPALResourceReserved) mean?
A card that has been working fine for more than 3 months is starting to produce this error occasionally
when DAQmxCreateAIVoltageChan() or DAQmxReadAnalogF64() is called.

Thanks,
Chandan Egbert

[Ed W]

Hi Chandan,

There isn't any documentation on this error.  Could you please post the code that reproduces this error?

Thanks,

Ed W.

[Tom_W_[DE]]

HI Chandan-

Common causes of this error are described in this KB.  You need to make sure that you are not attempting to access certain hardware resources as described there. 

Thanks-

[chandan]

Thanks for your replies Tom and Ed. The knowledgebase article was very useful.

There are multiple threads in my program that read the analog inputs. However, I'm protecting
access to the analog card with the mutex locks provided by LabWindows/CVI. The really
puzzling thing is that the software and the hardware have been working fine for over 3 months
and with no changes to either of them, this issue is starting to show up. Maybe the problem was
there all along and is only showing up now because additional (unrelated) software was installed
on the PC which might have changed the timing of the threads. I will investigate further.

Thanks for your help.

Chandan