communication problem with smart cameras

Hello
I am currently using VBAI 2010 with my smart camera and for the exchange of variables I use the function CNVCreateWriter to contact CVI 2010. It works fine when I'm in the configuration interface. I can use and modify all the variables with no problems.

But when I switch to the control interface I can't modify variables more. By using the CNVCreateWriter function, I get the error message: RUN-TIME ERROR NO FATALE: "Camera_Api.c", line 130, col 14, 0x0000107C thread id: CNVCreateWriter function: (is-6345 return value [0xffffe737]). Cannot complete the operation within the specified time

Someone know why it works in the configuration interface, but not in control in the real world interface?

by the way: I can't use VBAI 2011 right now because we do not yet have a license for it

Thanks in advance
Oliver

In configuration mode, things run slower on the smart camera because synchronize us execution with the update of Windows information on execution of State step, etc. When you run in inspection mode, it runs as fast as possible, so it may not be as many processor available time to process access requests to your application of C variables. Is the acquisition of your inspection triggered images or go faster the smart camera can possibly go (i.e. not triggered immediate mode)? If you're in free run mode, what happens if you change to wait next... This can give the processor a little more time to update the variables requests while he's waiting for the image to be acquired. Another way to test this theory would be to put one step behind in your inspection and see if it works (starting with 100ms and if it works, check out how small you can do).

Something that could also help is to define the variables on your host machine and in VBAI a variable of network that binds to the variables defined on your PC. In this way, the variable engine shared on RT doesn't have to manage the updates from your PC, as well as updates of VBAI, as well as the execution of the inspection as soon as possible, and your C application should not have problems to access the variables on the same machine. This means that your PC needs to be up and running when your control is running on the smart camera or there is time-out errors to access variables... but this may be good for your application. Here is a nice document that speaks in depth of shared variables.

http://zone.NI.com/DevZone/CDA/tut/p/ID/4679

Another option could be to use TCP, series, Ethernet/IP, or some other variable VBAI read/write Protocol.

Hope this helps,

Brad

Tags: NI Hardware

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