Name: Siemens SIMATIC S7-300 Module data
Brand: Siemens
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Memory concept

4.2 Memory functions

CPU 31xC and CPU 31x, Technical Data

Manual, 01/2006 Edition, A5E00105475-06

4-17

Note

Active system functions SFC82 to 84 (active access to the SIMATIC Micro Memory Card)

have a distinct influence on PG functions (for example, block status, variable status,

download block, upload, open.) This typically reduces performance (compared to passive

system functions) by the factor 10.

Note

For CPUs with firmware V2.1.0 or higher, you can also generate non-retentive DBs using

SFC 82 (parameter ATTRIB -> NON_RETAIN bit.)

Note

To prevent data losses, do not exceed this maximum of delete/write operations. For

further information, refer to the Technical Data of the SIMATIC Micro Memory in the

General Technical Data of your CPU.

Caution

Data on a SIMATIC Micro Memory Card can be corrupted if you remove the card while it

is being accessed by a write operation. In this case, you may have to delete the SIMATIC

Micro Memory Card on your PG, or format the card in the CPU. Never remove a

SIMATIC Micro Memory Card in RUN mode. Always remove it when power is off, or

when the CPU is in STOP state, and when the PG is not writing to the card. When the

CPU is in STOP mode and you cannot not determine whether or not a PG is writing to

the card (e.g. load/delete block), disconnect the communication lines.

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