Structure of a CPU 41x
2.5 Running a memory reset
S7-400 Automation System, CPU Specifications
2-14 Manual, 10/2006, 6ES7498-8AA04-8BA0
Values Retained After a Memory Reset
After the CPU has been reset, the following values remain:
● The content of the diagnostic buffer
The content can be read out with the programming device using STEP 7.
● Parameters of the MPI (MPI address and highest MPI address). Note the special features
shown in the table below.
● The IP address of the CPU
● The subnet mask
● The SNMP parameters
● The time of day
● The status and value of the operating hours counter
Special Features MPI parameters and IP address
A special situation is presented for the MPI parameters and IP address when a CPU memory
reset is preformed. The following table shows which MPI parameters and IP address remain
valid after a CPU memory reset.
Table 2-10 MPI parameters and IP address following memory reset
Memory reset .. MPI parameters and IP address ...
With inserted FLASH card ..., stored on the FLASH card are valid
Without plugged FLASH card ...are retained in the CPU and valid
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