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i'm facing a problem. 1st i got my PLC down siemens s7-400, cpu412-2 suddenly off. i tried to reset but all the cards r showing problem, EXT fault at cpu n at IM card. i removed all n the n placed back but the problem is still there. now i'm facing new problem at y HMI OO17 OP117 $545BD7012146b621 error. plz guyz reply fast, i'm curiously waitng ur comments. thanks.
faisal
faisal
