cRIO Chassis

[Tark]

How do you actually use a cRIO chassis such as NI-9149 ?

Do the C-Series modules connect via the FPGA and just appear as Daqmx channels ?

thanks

[crossrulz]

It depends how you want to interface with your modules.  Here are your options:

1. Program the FPGA to read the data and do whatever with it, even passing it up to the RT via the FPGA interface.

2. Use the Scan Engine.  This is generally slow (1ms sample rate is about as fast as you can reasonably get) and you get the values using a version of shared variables.

3. Use DAQmx.  This is limited by the chassis you use, but I'm pretty sure the 914X allow the DAQmx interface to control your modules.

Personally, I almost exclusively use the FPGA interface because I put a lot of my logic in the FPGA.

[Tark]

Thanks very much for the information, that's really useful.