PEAK-System Forum

I have almost no experience with CAN but have used PCANView 3.2 at someone else's direction.
Now my issue is on a different assembly machine using a Siemens S7-315 with ProfiBus to CAN bridge. The machine I/O is on CAN but we see a momentary communications freeze at random intervals - could be 15 secs to 3 minutes between freezes.
Can anyone help decode the attached trace file to help find the source of the error?
Also I see RTRs with ID 070A with no response. Is this a problem?
Any help would be appreciated.

Hi,

it will be better to post the problem in a Siemens PLC forum, we don´t know that system and in the trace we don`t see any CAN errors.

regards

Michael

Thanks for the recommendation but the folks on the Siemens forum don’t know anything about CAN bus.
How would electrical noise on the CAN bus show in a PCAN View trace?
If a station on the bus does not respond to an RTR what does that do to the performance of the bus?

Hi,

EMC could produce errorframes. You will see them as errors in the trace, when you have enabled this option in the tracer.

About RTR: this is depending on how the software protocol on that bus handles such an problem. By default, nothing will happen.

regards

Michael