DasyLab spurious crashing - Measurement Computing USB Pods ?

[JackSprat]

Hi Team.

Am running a DasyLab (V12) program which accesses a pair of Measurement Computing USB Pods.

The intention is to run a research lab instrument continuously - 24/7 so to speak.

The system is essentially fine, and can run perfectly for as long as say 24 hours, but then halts with a" Sampling Error " stock message

referring to loss of visibility of one of our USB pods.

We are using a sensible and conservative timebase.

Now I do realise that we may be experiencing inductive interference in our control pathways.

The machine is ultimately a high voltage and high current distributed lab assembly.

We are paying good attention to good engineering practice and managing ground and earth returns as best we can.

The USB pods are quite some distance from the PC but we are using active drive USB cabling certified to the distance ( appx 15 m )

The PC is clean and not overburdened.

Any insight or similar experiences would be welcomed.

Thanks

Jack Sprat

[CJ_Butler__DASYLab_Pro]

You have provided insufficient information to diagnose a problem.

There is an updated MCC-DRV 12.1 on the Measurement Computing web site. 

You should also be running the DASYLab 12.0.1 service pack update.

You should also be running a recent version of instaCal and the Universal Library (V6.23 or later, 6.25 is the current release).

For a 24x7 application, you have to agressively turn off power management. Microsoft does not configure your Windows computer for 24x7 operation.

You have to determine which USB hub your device is connected to (not that easy for the ones that use the HID driver), and disable power management. With the exception of allowing the screen to blank, you should not have any power management enabled... don't let the hard drive sleep, don't let the CPU sleep, and whatever else, don't let Windows put the USB hub to sleep!

[JackSprat]

Ok CJ - Very helpfull.

Am running latest issue of V12.

I think your ideas on power management are good advise.

Actually we have been running sucessfully for 4 full days now.

Jack Sprat