No Communication in same type of Models of S7-300 and PC

I am not getting Both CPUs which address should be unique?
Because one CPU is giving the same error by LED BF1 and LED SF.
I can download program from second CPU through profibus on first PLC.
I can see program by Monitoring 1st PLC through 2nd PLC.
How to troubleshoot this Profibus Fault?
 
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