i am using siemens S7 400. The CPU stopped working. I checked the diagnostic buffer but didn't get any fault. I started replacing every DI Do and I/O module, but it din't help. Lastly I went for the backplane. Can anyone suggest me the possible reason behind failure of the backplane of CPU.
after some days the backplane of DI also failed.
Please suggest reasons.....
after some days the backplane of DI also failed.
Please suggest reasons.....