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How does CANbus protocol handle nodes dropping or entering the network?

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  • 3 weeks later...
  • MVP 2023

CANbus is very tolerant of nodes dropping off and entering the network.  Obviously disconnecting the wires would cause a problem, but other than that it doesn't care.  Your code should check the health of the destination PLC before you send anything to it.


I usually put a routine with a "Check Alive" function block in all PLCs on the CANbus network along with indicators on a screen to watch the individual node statuses (statii?).  


The best way to answer your question is to build it and then start powering nodes down at a time when you won't break something or kill someone if something goes awry.


Joe T.

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