
Functions of the IM 151-7 CPU
8-15
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04
8.4.2 Memory functions
Introduction
You use the memory functions to generate, modify or erase user programs and
individual blocks. The memory functions also allow you to archive your own project
data in order to ensure the retentivity of your data.
General: Downloading the user program using the PD/PC
The complete user program is downloaded to the IM 151-7 CPU from the MMC
using the PD/PC. In certain situations, all of the blocks stored in the load memory
may be erased when the user program is downloaded.
In the load memory, blocks occupy the space specified under ”Load Memory
Requirement” in the ”General Block Properties”.
Programming device
Load memory Working memory
Stored on
the hard disk
Code blocks
Data blocks
Comments
Symbols
Code blocks
Data blocks
Process-related
parts of the code
and data
blocks
MMC
6ES7 953Ć8Lx00Ć0AA0
Micro
Memory
Card
SIMATIC
SIEMENS
Figure 8-4 Load and working memory
The program cannot be started until all of the blocks have been loaded.
Note
The function is only permitted when the CPU is in STOP mode.
The load memory remains empty if loading could not be completed owing to a
power failure or invalid blocks.
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