Siemens SIMATIC S7-400H System Manual page 62

Special functions of a CPU 41x-H
6.1 Updating the firmware without a memory card
Procedure
Proceed as follows to update the firmware of a CPU:
1. Open the station containing the CPU you want to update in HW Config.
2. Select the CPU.
3. Select the "PLC > Update Firmware" menu command.
4. In the "Update Firmware" dialog, select the path to the firmware update files (*.UPD) using
5. Click on "Run".
STEP 7 verifies that the selected file can be interpreted by the CPU and then downloads the
file to the CPU. If this requires changing the operating state of the CPU, you will be asked to
do this in the relevant dialog boxes.
NOTICE
Power on/off without battery backup
If the firmware update is interrupted by a power cycle without battery backup, it is possible
that the CPU no longer has a functioning operating system. You can recognize this by the
LEDs INTF and EXTF both flashing. You can only correct this by reloading the firmware
from a memory card.
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the "Browse" button.
After you have selected a file, the information in the bottom boxes of the "Update
Firmware" dialog box indicate the modules for which the file is suitable and from which
firmware version.
System Manual, 09/2007, A5E00267695-03
S7-400H