RUN LED and additional red LED is lit
Faults have occurred in the SIMATIC station. Use the diagnostic tools for analysis. For
additional information, refer to the "Diagnostics for the CPU (Page 98)" section.
STOP LED is lit
● 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 82)" 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.
7.2.5
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.
Fault - What should I do?
7.2 Preparing for expert support
Service Support and Diagnostics (V8.2)
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