Dear Indunil,

The CPU goes to stop mode because

1 due to I/O access error

2 due bus fault

3 ect.

There will be few interrupts can run. So in this case just try to download OB 86 and OB 122. But be careful now even after there is bus fault or module fault the cpu goes to run mode that may be dangerous. Other wise you should write some program in relative OB s for safety actions.

Also see OB82 and 83

For more details see step 7 help file on OBs.

Best Regards