Dear All,

we have three machine with S7300 communicating eachother with ethernet network.

suddenly one PLC is communiating with only one PLC instead of Two plc.

how to fix this network issue. but the CP343 pinging from network conforming no issue with cable and CP.

attached the error photo

please help me

Hi,

OK. I assume it was all working before and we are fault finding. First thing to do is check the CPU diagnostic buffer. Also check the diagnostic of the CP itself. Can you please upload them?

Is the connection which "Not Set Up" going to the partner directly or via a network device?

Is there something connected to the same subnet with the IP address? 

Is the remote partner connected up?

Are both of the CP card are in RUN mode?

Dear

find my answer

OK. I assume it was all working before and we are fault finding. First thing to do is check the CPU diagnostic buffer. Also check the diagnostic of the CP itself. Can you please upload them?

CPU and cp diagnostic buffer attached .

Is the connection which "Not Set Up" going to the partner directly or via a network device?

its not going directly to the partner , it goes with patch panle where our all PLC network connected through server

Is there something connected to the same subnet with the IP address? 

Yes one more PLC conected but that communication fine ( attached photo )

Is the remote partner connected up?

yes remote partner is healthy.

Are both of the CP card are in RUN mode?

All are fine .

The diag buffer suggest the CP card was modified recently.

Did you replace/reset/reload the CP?

Dear

we dont change , modified the CP recently

this was done during our LMS project ...but isse exists from one week..

communication between other partner is fine and if we modifed then it shoud not communicate wih all partner right ???

Hi, 

Go Step by step.  If it is just one connection makes me believe that it is only something to do with that specific connection. Maybe the IP address duplicated or the Server do not allow the coms. This can be one of the issues. 

The second thing is that the Event ID 16#F9C1;0220 should be evaluated. I was searching for a document for that one but I have not find anything so far.  Maybe something Siemens Support can help you with. 

Also a good test to try to connect the two partners via a direct connection to see if the server cause the issue or it is something with the CP itself.

Dear thanks,

the IP address configuration for both partner are same ...

we have same kind of network setup for other machine too..those are working fine.

yes ..i will check with the event id issue ..may be problem of CP.. some whare it blocking ???

there is no option for direct connection because it too far away ..the cable will not reach.