Memory concept
4.2 Memory functions
CPU 31xC and CPU 31x, Technical Data
4-10 Manual, 01/2006 Edition, A5E00105475-06
4.2 4.2 Memory functions
4.2.1 General: Memory functions
Memory functions
Memory functions are used to generate, modify or delete entire user programs or specific
blocks. You can also ensure that your project data are retained by archiving these. If you
created a new user program, use a PG/PC to download the complete program to the
SIMATIC Micro Memory Card.
4.2.2 Loading user program from SIMATIC Micro Memory Card (MMC) to the CPU
User program download
The entire user program data are downloaded from your PG/PC to the SIMATIC Micro
Memory Card (MMC). The previous content of the MMC is deleted in the process. Blocks
use the load memory area as specified under "Load memory requirements" in "General block
properties".
The figure shows the load and work memory of the CPU
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: If not all of the work memory area is retentive, the retentive area is indicated in STEP 7
module status as retentive memory (same as on CPU 317). You cannot run the program
until all the blocks are downloaded.
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