connect SCXI-1000 w/ 1140 module & 1301 end to DIO-32 card

[gth724k]

Hello,
I want to connect my SCXI-1000 box w/ 1140 A/D-module & 1301 connector block to my DIO-32 card.
When I go to MAX (4.0), I can install a new device for the DIO-32, tell it it is 1000 w/ 1140, and it all shows it. But when I try to do "test panel", it tells me that the slots are empty.
When I plug the SXCI into a 6259 analog card, I can read out signals via "Test Panel", but when I try to set up the SCXI as a new device, it won't work either.
I attached some screenshots to show the different scenarios.
How can I get this going?
Thanks.
Matt Hoepfer

[Yardov]

Hi Matt,

Thanks for the screenshots.

There are a couple of things here:

1. You cannot connect your 1140 module to your DIO-32 since there is no digitizer in the system. The 1140 is analog sampling hold which will keep current samples until the digitizer convert the signals (your 6259 in this case).

2. The second part is why is this SCXI module not working with your 6259. There are a couple of things to try:

            a) Try the module in other slot.

            b) Are any of the connector pins bended?

            c) Is the DAQ card working by itself?

Let me know the results and we can go from there,

Thanks,

Yardov

[gth724k]

Hello Yardov,

thanks for your answer.

I may have not clearly stated wht's going on here (it's quite confusing for myself as well), so here's what's going on:

I understand now that I cannot connect the SCXI 1140 to the DIO-32. Can I also not connect it via the SCXI-1000?

In case this doesn't work at all, here's what I did:

Connecting the SCXI-1000 to the 6259 works. I can see it using "Test Panel", and also read out data w/ LabView. What does not work is if I want to install it as a new device, where it would show me the slots and modules etc. I want to do this because I feel that with directly connecting the SCXI-1000 to the slot, I will only be able to read out a maximum of 16 channels from the SCXI-1000 to the 6259 card (since I can only connect the SCXI-1000 to one slot, which allows a maximum of 16 channels). However, I'll need to connect at least 4 1140-modules, better more (then have to daisy-chain the SCXI-1000). Therefore, I thought I need to install the SCXI-1000 as a new device, so I'd be able to read out more channels at once (that is also why I thought I may HAVE to use the DIO-32).

Any ideas what I am doing wrong here?

Thanks.

Matt

[Yardov]

Thank for the fast response,

The SCXI-1000 is only a chassis and it is the one routing signals and multiplexing everything. However you cannot connect this chassis to any DAQ card if there are no modules. Therefore, the module is the one connected to the card. Therefore, no you cannot connect the DIO card directly to any analog module.

About having four 1140 and all of them read by the 6259 is perfectly possible. Just connect it to one and configure software like page 13 step 9 said: https://www.ni.com/docs/en-US/bundle/373236m/resource/373236m.pdf

Then, you can run test panels on the modules and not anymore on the card.

Make sure you do all this in DAQmx as you are doing it on screenshot TestSCXI1000.jpg

You do not need to do anything in Traditional.

Finally, you should get positive results in screenshot TestPanelSCXI1140.jpg making sure it’s on the correct slot number. Try auto detect modules function (step 10 of same manual).

Good luck,

Yardov

[gth724k]

Hello Yardov,

sorry for late response. Thanks for helping me out with this...

Just for the clarification, I didn't connect 1140 directly to 6259, I always used the SCXI-1000 chassis.

However, I don't understand one thing (which is the cause why I initially even wrote about this whole thing):

When I connect 1301->1140->1000->6259, I can read analog inputs from the DAQ card, be it w/ MAX or LabView. However, MAX (of course) only offers me to read 16 channels.

I have a load cell on the first input of the 6529, and I need to measure analog signals parallel to the load cell signals. The load cell uses up the first 16 of the 32 channels of the 6259. Therefore, even using SCXI-1000 leaves me with no more than 16 additional analog channels I can read. So even if I install more than 2 modules = 2x8 channels, I cannot read out more than that from the 6259, since it has only 16 analog channels left.

So, the qeustion is: How do I read out more than 16 analog channels (= more than 2x 1140 modules) with only one interface slot left at the 6259 DAQ card?

Again, thanks for helping me here. Unfortunately, NI has not responded to my support request yet (which is strange, usually they are very customer-friendly...)

Matt

[Yardov]

Hello again Matt,

There has to be one little piece that connects between your SCXI and your 6259. 

This one enables to communicate with the entire chassis.

Even if you have a 6259 with 32 analog inputs, when you connect any card to the SCXI you will only use 1. Then all the Analog inputs of the SCXI are conditioned by each module then multiplexed by the chassis to one single AI from the DAQ card.

The test panels you will run are directly on the SCXI module (1140 in your case) and you can run these test panels for each of the modules configured under the SCXI chassis under DAQmx.

There is more information on this link page 3-29 about your specific module:

https://www.ni.com/docs/en-US/bundle/320515f/resource/320515f.pdf

Let me know how this goes,

Yardov