After closing a VI, and analog input suddenly turns a device on.

Background:
I have a LabVIEW 7.1, a Real-Time controller and FPGA card. The FPGA vi that I have is mostly IO. One of the IO's on the FPGA is the Analog output that would be controlled by my Real-Time controller that would send 0-10V to a fan motor.
Problem:
While running a test Real-Time VI that opens and controls my FPGA VI through a Read/Write, whatever I'm controlling works fine and in this VI I am not sending any IO to the fan motor. After I close that VI, suddenly, my fan motor gets turned on. Why would this input suddenly send a signal, become active, whatever you want to call it?
Thank you in advance for any assistance.
- Con

Hi Con,
Even if you are using a simple RT VI which is only doing reads/writes to digital lines the FPGA code still has a control or constant wired into the analog output node. So, even if you are not explicitly controlling the analog output line through the RT VI it will still write a value based on the control/indicator wired into that analog output node in the FPGA VI. What is the value of that control/constant for the analog output node (on the FPGA VI)? You will want to set that value to 0 (on the FPGA VI) to make sure that there is no voltage written out unless you control it via the RT VI.
The strange part about this issue is that the fan comes on after the FPGA VI has been closed via the RT VI. Right now I don't have an explanation for that. Sometimes there is a floating voltage on the analog output line when no VI is controlling it. However, this should be floating and should taper off after a while. Is this what's happening or is it a repeatable voltage value every time? I have tried to reproduce this issue but I don't see the same behavior.
Try these things that I have discussed above and let me know what you find out.
Best Regards,
Brooks W.
National Instruments

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[email protected] wrote:
>
> Need to sample from the serial port and 4 channels
> of analog input at the same time. Figured I need
> to use an internal clock to sync the aquisition
> since the serial port response delays every so
> often. Does anyone know how to sample from an I/O
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> appreciated.
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