You must stop your request before the engine may stop

I have an integrated application that uses LV DSC 6.0.2. The application starts and stops the engine tag programmatically. The application works fine, but on some machines, I'll get continuously the next dialog box when I try to stop the engine of the tag:

"You must stop your request before the engine may stop"

It's strange, because it only happens on some machines (it seems that it can occur on computers with ONLY of DSC Run-Time installed, not the full dev system. DSC LV).

The dialog seems to refer to the application of 'control' which tries to stop the engine... it isn't telling me that my devices servers need to be stopped.

This dialog box does not seem logical, I should be able
to build an application that can start and stop the engine... and why I get this dialog on some machines but not on others?

John Paul,

There are two points that we should ask ourselves:
1: you can have different loops while in your application where you read/write to and from the engine of the tag with the read/write Tag.vi. These screws has a stop of production which must be wired first the while loop. If you have cases where you do not connect this output to your time stop loop you could access the engine while you want to stop the engine in another loop with the Shutdown.vi engine. -> Make sure you have all drivers of DSC to access loops has stopped before you turn off the engine.

2nd: I guess he was once an issue of race with the DSC engine condition and how it access to shared memory with the read/write Tag.vi. But this condtion of race must be agreed with the version of LabVIEW DSC
6.1 or with other fixes for LabVIEW DSC 6.0.2. You can download patches (in this case, particularly the BVRTDatabase.dll) driver update page & of NOR: www.ni.com/support/ > Option 3, drivers and updates > Search drivers and updates > type 'LabVIEW DSC' > choose LabVIEW Datalogging and Supervisory Control 6.0.2 fixes.
You must apply the patches of this as well on your DSC 6.0.2 Run Time System!

I hope that one of the help of two suggestions to solve your problem.

Concerning
Roland

FTP://FTP.NI.com/support/LabVIEW/labviewdsc/fixes/6.0.2/

Tags: NI Software

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