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Hi everyone, I am hoping someone out there can help me out with a problem I have with a 135U CPU928B; Problem: This cpu has gone into STOP mode about 3 times in the past 12 months. Here is the Istack info. that was gathered. STP STP-BEF NEUZU MWA-ZU OBIGEL 16KWRAM KM-AUS KM-EIN DIG-EIN DIA-AUS QVZ From the information above, what I can gather is that QVZ (Timeout during data exchange with I/Os) is what caused the CPU to go into stop mode. If this assumption is correct how can I narrow down exactly which I/O module is the problem? Thank you for your help. Nelson Defreitas