Re: Canopen interruption

Am Mittwoch, 21. November 2012, 02:57:47 schrieb Martijn2:
> Hello,
> 
> We use an Altivar ATV31H055N4 from Schneijder.
> Once an hour there comes an error, called COF. This error means:
> Communication interruption, line 2 (canopen).
> 
> We use a USB to Can converter to see all the messages on the PC. All the
> messages are correctly sent from the master to all nodes. The other nodes
> are also working correctly. When the error appears sent the Altivar an error
> message.
> 
> We wire the the bus correctly with the resistors.
> 
> We don't know how to solve it, but what we can't see is that the signals on
> the bus are good. Are the digital signals/blocks on the bus good?
> 
> How can we see this, or is there another problem to solve?
> 
> Thanks!

Looking at the signal quality is always a good thing.
If you USB interface allows it, you should at least check what the two error 
counters are telling, and if that does not work,
take an oscilloscope to check signal quality like differential voltage and 
slope of the signal edges.
If the signal is OK, look at more system or software related things.

Regards 
    Heinz--
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