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Re: Does embedded computer count as controller?
If the cRIO is performing all of its required functions, and peripherals that may only be connected to the cRIO (e.g. modules & breakouts) are so connected, then the cRIO is being used properly. For the functions that are left you may use the auxiliary controller, provided it meets all the rules (particularly custom circuits and cost accounting).
Your proposed use would be legal—you may think of the custom circuit as everything starting from the wires connected to the PDB (for power) and the Ethernet port.
Remember that if you buy the embedded computer/controller as a unit, you must account for it as a unit. If you buy individual parts and assemble those, you must account for them separately. This can be critical for compliance with the $400 limit.
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