how many 9853 cards can run in a crio?

[tim79mc]

I need to read at least three, possibly four CAN buses in a supervisory/DAQ type of role.  I'm planning on using the cRIO 9067 and NI9853 cards.  We are already running one 9853 with some codes already written for our platform, so the idea is to just add another card.

Does the chassis have the capability to support multiple CAN cards?

[a_clucker]

Yeah, the controller and backplane of the 9067 can. If you're running many ports simultaneously at full tilt, you might hit a bandwidth bottleneck (but I wouldn't expect this unless you were at ~7+ ports). 

The only concern I have is for the FPGA program you write - you could hit size constraints there. I recommend mocking up a LabVIEW Project and FPGA VI with what you want to do and trying to compile. You won't need physical hardware to test this as LabVIEW FPGA compilation will pull in the required dependencies based on what I/O Nodes (and other) you put in the VI.