I'm trying to choose a FPGA-based analog I/O system, looking at a
7813R Reconfig. I/O in my PC, using one of the digital ports to connect to a
cRIO-9151 expansion chassis, which would house several analog modules, e.g. a
cRIO-9263.
This would seem to be a workable configuration. From the website:
The following list describes how many CompactRIO R Series Expansion
Chassis you can connect up to your R Series device, based on how many
digital connectors each R Series device contains.
- NI PCI/PXI-7811R – Up to four NI cRIO-9151 R Series Expansion Chassis (16 CompactRIO I/O modules)
- NI PCI/PXI-7813R -- Up to four NI cRIO-9151 R Series Expansion Chassis (16 CompactRIO I/O modules)
In the 9151 manual it says:
Power Requirements
These power requirements are for a full-loaded chassis and exclude the
power requirements of the I/O modules in the chassis. Make sure your
CompactPCI chassis or PXI chassis meets the power requirements for the
cRIO-9151 and CompactRIO I/O modules. For more information about the
I/O module power requirements, refer to the operating instructions for the
I/O module you are using.
Since I don't have either a CompactPCI chassis or a PXI chassis in my system, presumably the power must come
from someplace else. Unless I misunderstand, the expansion has no
power source except the 7813R, but the digital I/O ports naturally
don't have any voltages above +5 or below 0, so where does the 9263 get
its +/- 10?
Another question about the 7813/9151 combination: does separating
the FPGA from the chassis+modules mean slower communications between
these (compared to the 9103 for example)? If so, how much is the
delay?
Thanks!
-MWM
