Commissioning
9.5 CPU memory reset
S7-1500R/H redundant system
232
System Manual, 10/2018, A5E41814787-AA
Result after memory reset
The following table provides an overview of the contents of the memory objects after
memory reset.
Table 9- 15 Memory objects after memory reset
Memory object
Contents
Redundancy ID
Retained
Actual values of the data blocks, instance data blocks
Initialized
Bit memories, timers and counters
Initialized
Entries in the diagnostics buffer
1)
(retentive area)
Retained
Entries in the diagnostics buffer (non-retentive area)
Initialized
IP addresses
Retained
Device name (module name)
Retained
Counter readings of the runtime meters
Retained
Time of day
Retained
1)
The entries in the diagnostics buffer are the 500 most recent entries.
9.5.1
Automatic memory reset
Possible causes of automatic memory reset
The CPU executes an automatic memory reset if an error occurs that prevents normal
further processing.
Examples of such errors:
●
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 205).
Summary of Contents for Simatic S7-1500H
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