Error -200457 occurred at DAQmx Read

[Serge2]

Hi

I read the data using DAQmx 9.4 VIs. First time everything is OK, but when I try to run my program second time

I get a massage "Error -200457 occurred at DAQmx Read, Possible reasons: Specified property is not supported, because the task is not input task"

and my acquisition card does not read any data.

I call a big VI out of another big VI and every call all acquisition/generation tasks (DAQmx) are reinitialized.

Any ideas about the error ?

I attach the ScreenShot of this error message.

My config:

Windows 7 32 bit

Labview 2009

DAQmx 9.4

Acquisition card - NI PCI-6110

[Akiel]

May help if you could post the vi. Last time I saw this error i was trying to use a timing function not supported by the board. So its likely to be of that nature. Sorry cant give much more but hope it points you in the right direction.

[Serge2]

Thanks Tdarkins,

My VI is 420 Mb (with all sub-VIs).

I attach a simplified VI (only the DAQmx part) and screenshot of old version for DAQ initialization, when everything worked fine.

[Serge2]

Problem solved !

I have noticed that in older version of small VI (used by big VI) tasks were not cleared when pushing exit button (sceenshot, Acquire = false).

In my new version tasks were always cleared when pushing exit button.

So the solutions is -  not to clear tasks every time you stop the sub-VI.