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All ECU public CAN channels are on different CAN networks?

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jani12

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Consider an Electronic Control Unit (ECU) mounted in a vehicle. Let's say this ECU has Three CAN channels as follows:

CAN 1
CAN 2
CAN 3

Do these Three CAN channels have to be on different CAN networks? Another words, for example, CAN 1 and CAN 2 are never on the same CAN network?

It wouldn't make sense to connect CAN 1 and CAN 2 on the same network because why would ECU want to receive what it transmits? And why ECU want to receive identical information on CAN 1 and CAN 2?
 

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