Logging Multiple Thermocouples

[Graham123]

Hi Everyone,

I'm trying to monitor 4 Thermocouples simultaneously using a cDAQ-9174 and a NI 9211 thermocouple module. I'm very new to LabView. I found a VI that appears to do what I want elsewhere on the forum (I'll attach it), but I can't seem to make it work beyond recognizing the first channel of data. 

I'm thinking I may be missing something simple when it comes to selecting the analog inputs fort the VI, in order to get all four channels working.

I'm also open for suggestions of a better example VI that can log 4 thermocouple readings simultaneously.

Thanks for your help!

[DAD]

How are you specifying the thermocouple channels?  The VI you have will work as long as they are specified correctly.  It should be something like "cDAQ1Mod1/ai0:3".

[Graham123]

I think that may be the problem --I don't know how to specify channels. I can get the first graph to work with each of the four thermocouple input channels, but I can't get them to work simultaneously, as the input selector only appears to control the first graph/display.

[DAD · Accepted solution]

You've got to type the ":3" at the end of the channel.  Pick channel 0 from the list then add the ":3" to it.  That tells DAQmx that you want channels 0 through 3.  I have slightly different hardware (a 9213 instead of 9211) but your VI read the first 4 thermocouples I've got connected and plotted them in the first four stacked graphs.

[Graham123]

Thanks so much! That worked for me.