As far as communications go, the second ethernet port on the cRio (one that communicates to FMS) can be used to talk to the second cRio.
Quote:
<R68> All outputs from sensors, custom circuits and additional electronics shall connect to only
A. other custom circuits, or the following:
B. additional COTS electronics, or
C. input ports on the Digital Sidecar, or
D. input ports on the Analog Breakout, or
E. the RS-232 DB-9 serial port on the cRIO-FRC, or
F. the Ethernet bus connected to Port 2 of the cRIO-FRC,
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Emphasis mine.