Hello Baker;

If I may make 2 suggestions;

- your diagnostic buffer is presently limited to 10 enries, and since it is a circular buffer, your newest message erases the last one in the file. As such, it does not give a full view of the errors encounered and its possible solution.You can increase the size of the diagnostic buffer (in number of messages logged) by opening the Settings button in the diagnostic buffer screen.Unless your load and work memory are filled, I recommend you increase the number of messages t at least 50, possibly 100.

For example the last mssages you show indicate loss of connection problems with nodes 20 and 14. Are there any more nodes affected (in whch case yu should look at a termination problem)? We would know with more messages in the buffer.

- you have logged this request for a diagnostic OB 86 in at least 2 of the messages:

"Requested OB: Rack failure OB (OB86)

OB 86 is called by the operating system of the CPU whenever a remote rack fault is detected (Profibus or Profinet). If it cannot be found, the CPU will go to stop. If it is found, the CPU cn continue wrking, and will log further information in the diagnostic buffer. See the following discussion and create (and download) an OB 86 in your program; open the Bocks folder, New block, type OB, name: 86.Leave it empty (no programming) for your first tsts, open the diagnostic buffer if the BF LED lights up and see if there is more information on the fult.

https://support.industry.siemens.com/tf/ww/en/posts/s7-300-ob86-and-sf/150282/?page=0&pageSize=10

Hope this helps,

Daniel Chartier