Several Kinds of errors while executing a data acquisitio​n applicatio​n

Question

Hi everybody!
I have made a data acquisition application which acquires data from
four probes (Oxygen, Temperature, RedOx and pH) continuously. After a
few hours or days suddenly NI Service Locator windows service stops,
then my application crashes. Also I get other error messages for
example, system error, etc... I can see them in events log from Windows
OS. I attach here some screens. I use LV 7.0 Express with Measurement
and Automation Explorer 3.0. Could be the problem caused by the version
of drivers I use? I use MS Windows XP with SP2 and I don't use any
firewall or antivirus because it isn't necessary in the plant, and the
industrial computer doesn't have internet connection.
Many Thanks.
Attachments:
errors.zip ‏588 KB

Answer 1

jqm,
It seems like you have figured a good state machine model for your application. I am attaching a more elaborate state machine example than what is available in Example Finder. It uses a Producer/Consumer scenario with queues to pass data between two loops. You can follow that example to create your application. You might not be able to run the program unless you configure your Data Acquisition hardware to correspond to the software settings. However, you will be able to see the overall structure pretty well.
Study the example well to see how data is passed from one state to another. For your wait time you can use either Elapsed Time VI or Wait VI.
Hope that helps.
Kalin T
Applications Engineer
National Instruments
Kalin T.
National Instruments
Attachments:
State Machine Example.zip ‏426 KB