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All you need to drive a robot would be the wireless bridge and some custom software on a networked computer driving it. Depending on what data is accessible over the CAN bus, you could even implement some closed loop control and use sensors. A lot less expensive than a second CRIO, and it would work for probably 90% of the robots out there without any loss in functionality.
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Actually one intended use for the 2CAN is to be the backbone for a modular based control system. Basically it opens up ethernet to the world of CAN and vice versa. So your point about any ethernet device being able to drive a robot is absolutely correct.
Furthermore the 2CAN was not intended to be a replacement for the CRIO. However, with some small changes to the enable/disable protocol, it could free up the FPGA for teams to use (I suspect the FPGA is used for this purpose and this is why teams do not have access to it).