Siemens S-7 SF LED Status

I have a similar problem on my PLC as well, SF light is red on the CPU and all the analog I/O.

I have recently changed one of DI modules, could this be causing this problem?

In previous posts I have read that changing modules one by one might cause the problem to disappear.
 
1st of all, you should have started a new thread.

2nd, as the advice in this thread would have told you, investigate the diagnostics buffer.


As to a guess what is wrong:
You replaced a module, and then some other modules have begun to act up.
That could be that one the U-shaped module interconnects at the rear is defective (or missing ! You didnt remove one of these together with the replacement module ?).
 

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