Memory concept
4.2 Memory functions
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06
4-11
Note
This function is only permitted when the CPU is in STOP mode. Load memory is cleared if
the load operation could not be completed due to power loss or illegal block data.
4.2.3 Handling with modules
4.2.3.1 Download of new blocks or delta downloads
There are two ways to download additional user blocks or download deltas:
• Download of blocks: You already created a user program and downloaded it to the CPU
via the SIMATIC Micro Memory Card. You then want to add new blocks to the user
program. In this case you do not need to reload the entire user program to the MCC.
Instead you only need to download the new blocks to the SIMATIC Micro Memory Card
(this reduces the download times for highly complex programs.)
• Delta download: In this case, you only download the deltas in the blocks of your user
program. In the next step, perform a delta download of the user program, or only of the
changed blocks to the SIMATIC Micro Memory Card, using the PG/PC.
Warning
The delta down of block / user programs overwrites all data stored under the same name
on the SIMATIC Micro Memory Card.
The data of dynamic blocks are transferred to RAM and activated after the block is
downloaded.
4.2.3.2 Uploading blocks
Uploading blocks
Unlike download operations, an upload operation is the transfer of specific blocks or a
complete user program from the CPU to the PG/PC. The block content is here identical with
that of the last download to the CPU. Dynamic DBs form the exception, because their actual
values are transferred. An upload of blocks or of the user program from the CPU in STEP 7
does not influence CPU memory.
To Next Page
Loading...
