Operator control (hardware)
3.3 Memory concept
3.3.2 Persistent data (non-volatile data)
SRAM backup
In the D4xx, the integrated SRAM, which is buffered internally, is used for persistent data
storage. For information on the usable area for retain data, refer to the SIMOTION SCOUT
Configuration Manual.
Persistent data in the SRAM
Persistent data that are backed up include the following:
• Diagnostics buffer
• Retain variable (retentive user area)
• DP parameters (baud rates, DP addresses)
• IP address, subnet dialog box, router address
• Encoder data
The realtime clock integrated in the SIMOTION D4xx is also backed up in the same way as
the SRAM; thus, it has the same backup time.
If the backup time is insufficient, a battery can be connected by means of an external
fan/battery module. With the external fan/battery module, the backup time is approximately
10 years. The fan/battery module must be ordered separately.
A 3 V lithium battery SN: 575332 battery type (with cable tail and connector) is used. The
battery can be replaced without data loss, because the retain data are backed up internally.
Backing up persistent data on SIMOTION CF
The _savePersistentMemoryData system function is used to save the complete contents of
the nonvolatile data (battery-buffered SRAM) to the SIMOTION CF.
3.3.3 Monitoring persistent data (non-volatile data)
Diagnostic options
The consistency of the nonvolatile data memory (battery-buffered SRAM) and the status of
the battery backup are indicated to the user through user interfaces (diagnostics buffer,
system variables).
D4xx
3-14 Manual, 12.2004, 6AU1900-1AJ32-0BA0
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