● Components
● Versions
– Hardware (version, in case of replacement)
– Firmware
– Software
– Libraries used in the S7 program
7.2.3 How to read the CPU diagnostic buffer
Saving diagnostic data
You can make it easier for service engineers to perform initial diagnostics on a faulty CPU by
saving and having ready the contents of the diagnostic buffer as service data (as of firmware
version V4.0) or in the following formats:
● HEX format
● TXT format
Requirement
The CPU is in STOP mode.
Procedure
1. Select the faulty CPU in the SIMATIC Manager.
2. As of firmware version V4.0:
Select the menu command CPU > Save service data.
Specify the storage location and name. Save the files.
3. Select the menu command PLC > Diagnostics/Settings > Module Information.
The "Module Information - Online" dialog box opens.
4. Select the "Stacks" tab and read out the following system memory:
– Block stack (B stack)
– Interrupt stack (I stack)
5. Provide these data to the service engineers.
Fault - What should I do?
7.2 Preparing for expert support
Service Support and Diagnostics (V8.2)
82 Service Manual, 03/2016, A5E36200111-AA
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