System modifications during operation
17.8 Changing the CPU memory configuration
S7-400H
System Manual, 03/2012, A5E00267695-11
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17.8.3 Changing the type of load memory
The following types of memory cards are available for load memory:
● RAM card for the test and commissioning phase
● FLASH Card for permanent storage of the completed user program
The size of the new memory card is irrelevant here.
If you change your memory configuration in this way, the system does not transfer any
program parts from the master CPU to the reserve CPU. Instead, it transfers only the
contents of the unchanged blocks of the user program (see section Switch to CPU with
modified conf
iguration or expa
nded memory configuration (Page 152)).
It is your responsibility to downl
oad the entire user program to the new load memory.
Note
After reloading connections/gateways, it is no longer possible to change from a RAM card to
a FLASH card.
Starting situation
The fault-tolerant system is operating in redundant system mode.
The current status of the user program is available on the PG/ES as a STEP 7 project in
block format.
CAUTION
You cannot deploy a user program you uploaded from the target system here.
It is not permissible to recompile the user program from an STL source file, because this
action would set a new time stamp at all blocks and so prevent the block contents from
being copied when there is a master-reserve changeover.
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