Thermocouple

[n 516]

When I use "Continuous Thermocouple Measurement.vi" from LabView for more than 8 channels, it doesn't work. Although we can modify the front panel to display more channels of data, the block diagram uses a sub .vi "channel string to name array.vi" that only first 8 channels can be used since a output of that sub .vi "first 8 channel name" is connected. It gave me an error:"Error-10007 occured at A1 SingleScan. Possible reasons: NI-DAQ LV: A channel, port, or counter is out of range for the device type or device configuration; or the combination of channels is not allowed; or the scan order must be reversed (0 last)". Could anyone let me know how to use it for more channels (more than 8 channels)? Thanks.

[Dennis_Knutson]

The subVI channel string to name array has nothing to do with the error. It only sets the plot labels. What board are you using and what is the channel list that you've entered.

[n 516]

I use PCI-6033E board, SCB-100 connector block and T type thermocouple. Also, I use "Continuous Thermocouple Measurement.vi" from LabView. The channel 0 is for Cold Junction Channel. The channels I can use are Channel 1,2,3,4,5,6,7 (they work). If I enter Channel 8 and larger number, it doesn't work. I thought I have to make some modifications on the block diagram to make it work for more channels. Hope to get your help.Thanks.

[Dennis_Knutson]

With 32 differential channels, you shouldn't have a problem. Are all of the channels configured the same? The example doesn't call AI config so that's something you might want to add in case the default configuration isn't correct. Can you go into max and read channel 9 for example?

[n 516]

Yes,you are right. I entered MAX and run "Test Panel". It only can read channels 0-7. When I entered channel number as 8 or larger, it give me Error Code -10007. How should I configure channels 8-31? Thanks a lot.

[Dennis_Knutson]

I don't have DAQ device in my computer right now but in MAX you should be able to right click the device and select properties>AI. Whatever the settings for channels 0-7 are, copy those for the other channels.

[n 516]

Thanks for your prompt reply. I tried to right click the device and select properties>Al. I can't find a place to input the settings for different channels. There are only "Polarity/Range" (-10.0V-+10.0V) and "Mode" (Differential) in Al.
Could you find out where to make those settings for the other channels? You are very helpful.

[Spencer S.]

Greetings,

I think the following KnowledgeBase should provide a solution to your problem:

Why Can't I Read More Than 8 Differential Channels on My 64-Channel DAQ Board? [link removed; article no longer available]

Good luck with your application.

Spencer S.

[Dennis_Knutson]

Thank you for reminding me about this issue with differential channels. I think that's the answer.

[n 516]

Thanks for your information.Does it mean that I only can use 16 channels instead of 32 channels (I'm using SCB-100 board).