Question about field point error

[FUAD]

Hi guys. I use field point to generate analog signal from my PC. I try
to write an analog value to one channel in FP (4-20 MA) along with OPC
server. It's succeded to write value for the first time, after that,
it's cannot write any value again , the error message tell
"Error writing to items
FP RES\FP AO- 200 @2\channel 0 returned IDispatch error #32976"
and opc status is changed to "Bad: Non Spesific". But if I write value
0 mA to channel 0, it's return the same error message, and then the OPC
status is changed again into "Good:Spesific".

Is there Anyone who can help me...?

Thanx
puat133

[NIJanell]

Hell Puat,

Can you post a screenshot of the error and your block diagram?  Has this program ever worked correctly?  Which software versions are you using?  How about driver versions? 

You might want to try using a shipping example like Analog Output.vi.  If you go to Help >> Find Examples >> Hardware Input and Output >> Fieldpoint >> Getting Started, you should be able to find it.

Thanks!

Janell R. | Applications Engineer

[FUAD]

NIJanell wrote:
> Hell Puat,
>  
> Can you post a screenshot of the error and your block diagram?  Has this program ever worked correctly?  Which software versions are you using?  How about driver versions? 
>  
> You might want to try using a shipping example like Analog Output.vi.  If you go to Help >> Find Examples >> Hardware Input and Output >> Fieldpoint >> Getting Started, you should be able to find it.
>  
> Thanks!
>  
> Janell R. | Applications Engineer
>  
>  

I use Fieldpoint v.50 which its included in "measurement and automation
explorer" v.4. Before using this version, I use FP v.20, but it's
doesnt work. I dont know why, but before me, someone in my campus using
this FP with this software version and it's work well. My Fieldpoint
hardware is "FP-1000 series". I use this FP with RS232 to built some
simulation in VB, using OPC server. If I try to send an analog signal
directly from Measurement and automation server its doesnt retrieve any
error message. But if I use OPC it's retrive error message like I have
posted. Might be you can help me, what's "error #329276" means. Because
this error type doest exist in "FP error and warning code" in MAX help.

Thanx for your reply.

puat133

[NIJanell]

Hello Puat,

Have you or anyone else changed the software since it last ran correctly?  If you simplify your code to just one channel, do you still get this error?  You might want to try writing to the OPC server through Server Explorer, which should have installed into the National Instruments folder on your computer.  This seems like a FieldPoint error, but it is definitely undocumented.  By using the Server Explorer, we can determine whether the problem is within the VB code or the hardware.

Thanks,

Janell R | Applications Engineer

[Khalid]

Puat,

Do you _have_to_ use OPC?  If you don't have to, you are probably better off using the direct Optomux serial commands.  In fact there's a VB5 example for this available:

ftp://ftp.ni.com/support/fieldpoint/Examples/Visual%20Basic/

If you however have to use OPC, then as Janell suggested you will want to get this working with an OPC Client, like Sever Explorer, first. 

-Khalid

Message Edited by Khalid on 11-21-2006 10:54 PM