Looking to set up NI 9233 module, though through what bus?

[jonathanupr]

I am a bit new on doing high-speed vibration analysis...I see a ton of info on the software programming aspect of things, though my main concern right now is getting the hardware setup correct 1st.

Right now my data-acquisition test platform consists of the following:1) A main desktop or laptop PC with a LabVIEWsoftware platform that integrates multiple device inputs into a live read-out of test-cell data-acquisition & control, as well as report analysis during and after the test.  The multiple device inputs to this desktop/laptop are the following:

1) A dedicated control & daq semi-PLC device that has 2 data output options: a) USB ... 1 averaged data sample per second...this is for read purposes only, & b) CAN input/output... 10 samples per second data outpu, and allows for a control input from the desktop/laptop via a NI-8473 CAN to USB converter.

2) NI DAQ hardware inputs via MAX configuration.

My main concern is I do not want to create a bottleneck for the vibration DAQ input data.  If I am looking to sample up to 5,000 samples per second max and down to 200 samples per second minimum for vibration analysis, would I be able to pull this much data in per second in using the NI-9233 module through the USB configuration?  Say I have more than a few USB devices hooked up to the Desktop/laptop PC (such as other USB DAQ input/output modules) will these limit the speed input of the NI-9233 module?

My next concern is how to configure my present VI during run-time while taking all DAQ inputs (some at 1 sample per second, others at 10 samples per second).... when I begin taking up to a 5khz sampling rate for vibration diagnostics, do I just average out the other ZEROs that will be read from the other devices?  And I will then most likely to need to add another time controlled loop to allow only a 4 times/per second output to the external control device so as not to time-out that device.

What would be the most efficicent cost-wise setup for the 9233 module that I could use satisfactorily?  USB, PXI, CRIO?

Also, is the Sound & Vibration Analysis toolkit worth getting?  I didn't check yet but does it have a cost per deployment to each executable?

Thanks.

[Dennis_Knutson]

duplicate post

[preston_johnson]

For your DAQmx needs, I would use the new cDAQ chassis, such as the new four slot, https://www.ni.com/en-us/shop/model/cdaq-9174.html.  These support multi rate scanning and only use one USB port.  You can add other I/O modules for the sensors you need. 

For the vibration measurements, are you also mapping your sampling of the vibration to the rotation of the unit under test?  Order analysis, part of the Sound and Vibration Measurement Suite, can help. 

[jonathanupr]

main concern is the desktop/laptop PCs capability of pulling data into its system via USB...

if I'm pulling data through the USB ports from the following devices: 1) DAQ & Control PLC, 2) NI USB CAN, etc.... is there going to be enough input capacity into the desktop/laptop via USB to simultaneously do high-speed accelerometer acquisition...if so, what would be possible scenarios that would present limitation of the system.....and further what would be the realistic max sampling rates of such a system?  Would the system be stable enough for control purposes as well?

alternatives could be going through the PCI bus?

thanks for the help..

[preston_johnson · Accepted solution]

I thiink you will be suprrised with the capabilities of high speed USB.  For example, when we first came out with CompactDAQ, we put 8 modules of the 9233 in a chassis and ran them at full rate (32 channels at 50kSA/sec). 

If you have a dual core notebook, with good USB 2.0 ports, you can use one port for the USB CAN (which is relatively slower), the PLC is slow scanning (100Hz or so), and then a Compact DAQ chassis for all your really high speed stuff, you should be fine. 

It is hard to benchmark without  having the full application.  My experience suggests getting all the data into the PC will be the easy part.  How you manage and analyze the data will determine what control you are able to do.