Memory Concept; Memory Areas And Retentive Address Areas; Technology Cpu Memory Areas - Siemens SIMATIC S7-300 Manual

Memory concept

6.1

Memory areas and retentive address areas

6.1
6.1.1

Technology CPU memory areas

Introduction
The memory of the Technology CPU is divided into three areas:
Figure 6-1
Load memory
The load memory is located on a micro memory card (MMC). It is used to store code blocks,
data blocks and system data (configuration, connections, module parameters, technology
system data etc.).
For the Technology CPU, the size of the load memory corresponds to the size of the MMC
minus approx. 3 MB. The 3 MB are required for the integrated technology and are therefore
not available to the user.
Blocks that are identified as not relevant for the execution are stored exclusively in the load
memory.
You can also store all the configuration data for your project on the MMC.
S7-300 CPU Data: CPU 315T-2 DP
Manual, 12/2005, A5E00427933-02
Technology CPU memory areas
6
6-1