9237

[zwartpete]

Hi everyone.

I am new to LabView, but not a stranger to NI hardware.  I have a NI9237 Bridge module running in a cDAQ 9172 chassis.  I have downloaded the Bridge - Continuous Input.vi (attached), and found that it does exactly what I need, on a per channel basis, but I need to expand it across all 4 imput channels of the 9237.  I'd likekeep the ability  to enable the Offset Null and Shunt Calibration on a per channel basis. Since I will be only using full bridhe load cells, I can eliminate the case structures for Pressure and Torque from the example, and I've figured that part out, but I don't quite understand what I need to do to sample all 4 channels concurrently.

Thanks for any help!

[ChaisePotato]

Hi Zwartpete,

It looks like channel expansion is what you need to accomplish this. Take a look at these two articles:

http://www.ni.com/white-paper/52634/en/

http://digital.ni.com/public.nsf/allkb/B7E7C6A92467E5438625792E0067ED80

Hope this helps!

[Dennis_Knutson]

Since you are using the same device/module, I don't see where any expansion is required. Have you simply tried to select multiple channels with the browse option or just typing them in? The syntax is just dev1/ai0:3 for contiguous channels.

[zwartpete]

ChaisePotatoe,

Thanks for the info.  It's not quite applicable in my case, as I'm not expanding across different modules or chassis.  I only need to expand the channels on 1 NI9237, but retain the Offset Nulling and Shunt Calibration on a per channel basis.  I think I've found a solution, in that those 2 functions can accept a channel name, and it appears to be working.  Need to do some further testing with different load cells.

Thank You.

zwartpete

[zwartpete]

Dennis,

Thanks for the help.  My problem is better explained in my reply to ChaisePotatoe - I need to retain seperate controls for each channel, as well as being able to do the Offset Nulling and Shunt Calibration on a per channel basis, so they each need to be individual tasks.  I was having a problem linking those functions to a specific channel, but think I'm on the right track now.

Thanks,

zwartpete