Error-88709
For more information, I would like to refer you to a post that I found in which a user describes my situation almost exactly:
http://forums.NI.com/NI/board/message?board.ID=250&message.ID=22058&query.ID=737852#M22058
I have a DAQ 6251, which I use to control an axis 2 scanning mirror (ao0:1), and collated the tensions of mirror (ai0:1). Recent changes to some parts of the theDAQ IO configuration code produced a-88709 error, which States that 'the specified operation cannot be performed because a task was abandoned or a device has been removed from the system'. This happens directly after DAQmx Read.vi, since I tried to restore the code for versions prior to this error, but this issue remains.
The smoking gun can reside in channels - acquisition of configuration data and tasks are created, configured and initialized in a "main loop", while the DAQmx Read.VI is mentioned in a separate while loop. A local Variable is used to pass the task appropriate between these loops.
I know, I know, local Variables are BAD and I'm getting a taste of it now, but I'm stumped for the following reasons:
1. the error only occurs after the DAQmx Read.vi
2. I followed the task in question with sensors and there is the chain of signal (via the local variable), until the DAQmx Read.vi. I assumed that the task is not abandoned, if this is because I am able to follow and identify its name upward through the location of the problem.
3. call the DAQmx Read.vi of the main loop does not cause this error of-88709.
A sane man deduct its problems stem from the local variable, and maybe a few unexpected race condition. However, I am a well rounded individual and in addition to mental health concern, I would like to know how this can happen, especially when the local variable setting worked "perfectly well" so far.
Nothing should be able to abandon this task unless the user finishes. I don't know that's the little water once you get behind the scenes, so please let me know what could have happened and which could cause a task apparently in good health to die. The other option of 'device removed/disabled' seems very unlikely, that is to say that it is probably a real concern. So any thoughts on that?
In addition to this, I seem to have lost control of my mirror. Commands to move the mirrors is more work, that may or may not be linked to this problem.
Unfortunately, the thread of 2006 was never wrapped up, so I'm not sure which is the culprit. I download code screenshots of the DAQ config sequence, which will help an eye more practiced with spotting hopefully some problems. P
Rental respond with questions or the critques.
Thank you
JM
Just check erase a part of the previous speculation on the source and the solution to this error:
Troubleshooting had shrunk the question until the task DAQmx be invalidated when the config of scope Subvi, specifically during "initialize NI Scope." I had wired the property to true the "Reset Device", which caused the scope temporarily 'not exist' in the system.
This caused problems because my DAQmx tasks set their external clock to the signal "EndOfRecordEvent" of the bezel. When the scope 'disappeared' briefly, as well as the source of the signal and data acquisition tasks were abandoned. This is why the front scope DAQmx erased the problem tasks configuration - nothing has been dependent on the State of bearings when it has been reset.
Another solution is to export this signal to another location using the 'Signal.vi niScope export. This allows you to route a signal of scope to move to a separate output terminal. I chose to send the "EndOfRecordEvent" to "PXI_Trig0". Now, rather than fix the DAQmx tasks to clock out of reach, you point them to the PXI_Trig0 line, which will always be there, even if the scope is reset to zero!
To summarize:
The error-88709 came from resetting the scope when a task DAQmx was using as an external clock source. Possible solutions to this problem are:
1. don't reset the scope when you setup / initialize it.
2 Configure/initialize the scope before you create other tasks that will require a few goods or signal from the field of normal operation.
3 re - route all signal range than other tasks or material is based on the use of the "niScope export signals" and indicate the dependent tasks this new location.
Number 3 is the best. This prevents the dependencies is abandonment of the never the source signal is temporarily interrupted.
I hope this saves some people time and trouble.
JM
Tags: NI Hardware
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