Switch To Cpu With Modified Configuration Or Expanded Memory Configuration - Siemens SIMATIC S7-400H System Manual

Communication functions and resulting jobs
After it has received one of the jobs specified below, the CPU must in turn generate
communication jobs and output them to other modules. These include, for example, jobs for
reading or writing parameter data records from/to the distributed I/O. These jobs are rejected
until the update is completed.
● Reading/writing data records using OCM functions
● Reading data records using SSL information
● Disabling and enabling messages
● Logon and logoff for messages
● Acknowledgement of messages
9.3.3

Switch to CPU with modified configuration or expanded memory configuration

Switch to CPU with modified configuration
You may have modified the following elements on the standby CPU:
● The hardware configuration
● The type of memory module for load memory. You may have replaced a RAM card with a
For information on steps required in the scenarios mentioned above, refer to section Failure
and replacement of components during operation (Page 185).
Note
Even though you have not modified the hardware configuration or the type of load memory
on the standby CPU, there is nevertheless a master/standby changeover and the previous
master CPU changes to STOP.
Note
If you have downloaded connections using NETPRO, you can no longer change the memory
type of the load memory from RAM to FLASH.
When you initiate a link-up and update operation with the "Switch to CPU with modified
configuration" option in STEP 7, the system reacts as follows with respect to handling of the
memory contents.
Load memory
It does not copy the content of load memory from the master to the standby CPU.
S7-400H
System Manual, 09/2007, A5E00267695-03
Note
The last three of the functions listed are registered by a WinCC system, and automatically
repeated when the update is completed.
FLASH card for example. The new load memory may be larger or smaller than the old
one.
Link-up and update
9.3 Link-up and update
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