Commissioning
12.5 CPU memory reset
S7-1500R/H redundant system
418 System Manual, 01/2024, A5E41814787-AF
Result after memory reset
The following table provides an overview of the contents of the memory objects after
memory reset.
Table 12- 16 Memory objects after memory reset
Actual values of the data blocks, instance data blocks
Bit memories, timers and counters
Entries in the diagnostics buffer
1)
Entries in the diagnostics buffer (non-retentive area)
Device name (module name)
Counter readings of the runtime meters
1)
The entries in the diagnostics buffer are the 500 most recent entries.
Password for protection of
confidential configuration data
The password for protection of confidential configuration data is retained after a memory
reset of the CPU. The password is only deleted when the "Delete password for protection of
confidential PLC configuration data" option is set.
You can find additional information on the password for protection of confidential
configuration data in the Communication
(https://support.industry.siemens.com/cs/ww/en/view/59192925) function manual.
12.5.1 Automatic memory reset
Possible causes of automatic memory reset
Proper continuation of work is prevented in the following cases. The CPU performs an
automatic memory reset.
These can be caused by:
• User program is too large and cannot be loaded to the work memory in full.
• The project data on the SIMATIC memory card are damaged, for example because a file
was deleted.
• You remove or insert the SIMATIC memory card. The backed-up retentive data differs in
structure from the data in the configuration on the SIMATIC memory card.
• SYNCUP aborts in the backup CPU. You can find more information in the section SYNCUP
system state (Page 388).
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