Assembly of a CPU 41x–H
5.4 Mode switch
S7-400H
System Manual, 03/2012, A5E00267695-11
63
Data retained after a memory reset...
The following values are retained after a memory reset:
● The content of the diagnostic buffer
If no FLASH card was inserted during memory reset, the CPU resets the capacity of the
diagnostic buffer to its default setting of 120 entries, i.e. the most recent 120 entries will
be retained in the diagnostic buffer.
You can read out the content of the diagnostic buffer using STEP 7.
● The MPI/DP interface parameters. Note the special features shown in the table below.
– MPI address
– Highest MPI address
– Baud rate.
● Parameters of the PN interface. Note the special features shown in the table below.
– Name (NameOfStation)
– IP address of CPU
– Subnet mask
– Static SNMP parameters
● The time of day
● The status and value of the operating hours counter
Special feature
A special situation is presented for the MPI/DP and PN interface parameters when a memory
reset is preformed. The following parameters are valid after a memory reset:
● Memory reset with inserted FLASH card:
The parameters stored on the FLASH card are valid
● Memory reset without inserted FLASH card:
The parameters in the CPU are retained and valid.
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