Hello, I just replaced the cpu with a used one from another machine, (exact) and I am unable to connect with cpu, I have checked everything out on my end. I have hooked up many times before but this one is weird given the fact all of my units are showing Bus fault. CPU has green light, but 4 out of 5 of the D.O's aren't lit?
Siemens S7 cpu 412 unable to connect.
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Dear All
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