Siemens SIMATIC S7-400H System Manual page 84

Special functions of a CPU 41x-H
6.4 Updating the firmware without a memory card
Procedure in SIMATIC Manager
The command procedure is the same as in HW Config, i.e. "PLC > Update firmware".
However, STEP 7 waits until the command is executed before it verifies that the module
supports this function.
Note
Update security
For reasons of firmware security, the CPU validates a digital signature before it runs the
firmware update. If it detects an error, it retains the current firmware version and rejects the
new one.
Values retained after a firmware update
The following values are retained after a CPU memory reset:
● Parameters of the MPI (MPI address and highest MPI address).
● IP address of the CPU
● Device name (NameOfStation)
● Subnet mask
● Static SNMP parameters
84
System Manual, 03/2012, A5E00267695-11
S7-400H