CDAQ lock-up on Windows 7 when app idle.

I scarse few details to help fix an issue I witnessed while on-site yesterday.
A LV app running under Win 7 using a cDAQ chassis will lock-up LV if the app is left idle for a couple of hours.
WHile Idle it just grabs samples from the AI chnnels and displays same.
Attempts to open the FP of the sub-VI grabbing the samples locks-up so I was not able to check if there where hardware errors. memory was pegged out at the time.
While monitoring the app for over an hour I saw no memory leaks and did not have time to wait for three hours or more so my facts are limitied.
For the sake of this post I am only interested in finding out if others have seen cDAQ locking up when the app is idle.
I did check the power save options and disabled the power saving feature for the USB but the isue did happena again after siting idle over-night.
SO...
Has anyone seen lock-ups of cDAQ ?
Ben
PS I added some logging to catch low-level errors when it happens again.
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

tst wrote:
Not locking up, but I have seen a cDAQ constantly throwing errors after plugging in (or, more likely, unplugging) a USB flash drive (Win XP in that case) and it only stopped after the cDAQ was turned off and back on. It seems to me that there are things happening in the USB stack/driver which the cDAQ doesn't always like.
One thing you could try is looking the event log for Windows or search to see if there's a utility which would let you log USB events in the system. Assuming that's really the source of the issue (and it wouldn't shock me - your app might be stuck in the middle of a VISA call), then that might help to pinpoint it.
Your sense that it is USB related was confirmed by the log file.
I still have to follow-up with the customer to see if the issue is still re-occuring but the logged error indicated the buffer on the CDAQ backplne was over-flowing... NI Support found a KB article that explains that when doing highspeed I/O, and Windows going in to out of screen saver will stall the USB I/O long enough for the buffer to over-flow.
Customer was going to work with NI Support to fiddle with Windows and shut-down all of the power-saving etc options that could get in the way.
I THINK the error code was "-200361".
Take care,
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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