Dual CAN bus systems

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Dual CAN bus systems

by Offshore Systems (UK) Ltd :: Rate this Message:

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Guys,

 

We have been asked to propose a system based on a dual CAN bus system with fallback redundancy running NMEA2000 protocol.

 

Can anybody point us in the best direction to monitor the primary network, detect a system failure and fall back to the secondary network? I cant see a protocol issue but wondered about the practical issues of detecting a failed network and switching the network. Any pointers?

 

Best regards

 

Bruce Coward

Offshore Systems (UK) Ltd

T: +44(0)1425 610022  F: +44(0)1425 614794

E: bruce@...  W: www.osukl.com

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Re: Dual CAN bus systems

by stunbmun :: Rate this Message:

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Just a thought, but would it be reasonable to get a dual CAN micro, wire up two transceivers, and then go.

If you have errors on one bus, change the other to be your "primary".  When you transmit, send it out both.  

If your embedded code is modular enough this would require very little extra work.  Typically micros with multi-CAN channels have identical register sets just at different base addresses.  You could raise faults whenever one bus detects something different or an error.