Memory concept
4.1 Memory areas and retentivity
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06
4-9
SIMATIC Micro Memory Card (MMC) copy protection
Your SIMATIC Micro Memory Card has an internal serial number that implements an MMC
copy protection. You can read this serial number from the SSL partial list 011C
H
index 8
using SFC 51 "RDSYSST." If the reference and actual serial number of your SIMATIC Micro
Memory Card are not the same, program a STOP command in a know-how-protected
module, for example.
Reference
Further information
• on
SZL parts list
refer to the
Instruction list
or the
System and Standard functions
manual.
• on resetting the CPU, refer to the
Operating instructions CPU 31xC and CPU31x,
Commissioning, Commissioning Modules, CPU Memory Reset by means of Mode
Selector Switch
Useful life of a SIMATIC Micro Memory Card (MMC)
The life of an SIMATIC Micro Memory Card depends mainly on the following factors:
1. The number of delete or programming operations,
2. External influences such as ambient temperature.
At ambient temperatures up to 60 °C, a maximum of 1000,000 delete/write operations can
be performed on a SIMATIC Micro Memory Card.
Caution
To prevent loss of data, always make sure that you do not exceed the maximum number of
delete/write operations.
See also
Operating and display elements: CPU 31xC (Page 2-1)
Operating and display elements: CPU 312, 314, 315-2 DP: (Page 2-5)
Operating and display elements: CPU 317-2 DP (Page 2-7)
Operating and display elements: CPU 31x-2 PN/DP (Page 2-9)
Operating and display elements: CPU 319-3 PN/DP (Page 2-11)
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