● If the STOP LED is lit, read out the diagnostic buffer. For additional information on
procedures, refer to the "How to read the CPU diagnostic buffer (Page 66)" section
Save the diagnostics buffer to a HEX file and to a TXT file!
● These data can be analyzed by trained service engineers. They contain information about
the cause, for example:
– I/O error
– Synchronization error with an H-CPU
● If the possibility exists that a hardware error in the I/O caused the CPU to switch to STOP
mode, save the diagnostic buffer of the relevant module and the associated bus interface
module (for example, CP 443-5).
● Generate a memory dump.
All LEDs are off or are flashing
You recognize the "CPU defective" status by the following LED displays on the front of the
CPU:
● All LEDs are flashing.
● All LEDs are off, even though the power supply is switched on.
For additional support, contact your Siemens representative or Technical Support. Have the
"information in the event of a fault" indicated above ready.
6.2.5 How to back up the diagnostic data of the PCS 7 OS
Basic procedure
We recommend that you back up the diagnostic files for analysis of the cause of the OS fault
by experts.
Back up the diagnostic folder
1. Close WinCC.
2. Back up all diagnostic folders of WinCC
(default: [Installation path]\Siemens\WinCC\Diagnostics).
3. Give this information to the service employees.
You can back up the diagnostic files using the shortcut menu command Save to >
Compressed (zipped) Folder.
Note
Once the diagnostic files are backed up (not in diagnostic folder), you can delete the
content of the diagnostic folder. In this way, you avoid keeping old information in the new
diagnostic files.
If the same error occurs the next time you start WinCC, make an additional backup to help
the experts. Only a few messages will need to be analyzed in this backup.
Failure - What next?
6.2 Preparing for expert support
Service support and diagnostics (V8.0)
68 Service Manual, 03/2012, A5E02779775-02
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