Siemens Simatic S7-300 Specifications Page 45
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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x
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The CPU memory can be divided into three areas:
CPU
Load memory
(stored on MMC)
CPU memory
System memory
Work memory
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Figure 4-1 CPU memory areas
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The load memory is located on a Micro Memory Card (MMC). The amount of load
memory corresponds exactly to the MMC. It serves to store code and data blocks
as well as system data (configuration, connection, module parameters, etc.).
Blocks that are identified as non runtime-related are stored exclusively in load
memory.
You can also store all the configuration data for your project on the MMC.
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