Siemens Simatic S7-300 Specifications download pdf (Page 49)

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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x

A5E00105475-03

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Memory functions are used to generate, modify or delete entire user programs or

specific blocks. You can also ensure that your data is retained by archiving your

own project data.

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All user program data is downloaded from your PG/PC to the CPU via MMC.

Blocks use the load memory area as specified under "Load memory requirements"

in "General block properties".

Load Memory Work Memory

Stored on hard drive

Code blocks

Data blocks

Comments

Symbols

Code blocks

Data blocks

Parts of code and

data blocks required

for startup *

MMC

6ES7 953-8Lx00-0AA0

64k Byte

CPU

Figure 4-2 Load memory and RAM

* If the RAM is not completely retentive, the retentive portion of the RAM is

displayed as retentive memory in the STEP 7 module status (as with

CPU 317-2 DP).

You cannot run the program until all the blocks have downloaded.

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This function is only permitted when the CPU is in STOP mode.

Load memory is empty if this load operation could not be interrupted due to power

loss or illegal block data.

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Siemens Simatic S7-300 Specifications Page 49