Maintenance
S7-300 Programmable Controller Hardware and Installation
9-4 A5E00105492-01
Updating the Operating System
How to update the operating system (OS):
Table 9-2 Operating system update with MC/MMC
Step Action required CPU Response
1. Using STEP 7 and your
programming device, transfer the
update files to an empty
MC/MMC.
-
2. Remove the
backup/rechargeable battery from
respective CPUs.
-
3. Switch off the CPU power supply
and insert the MC/MMC that
contains the OS update.
-
4. POWER ON. • The CPU automatically recognizes the
MC/MMC and the OS update and then
starts the update.
• All LEDs are lit during OS update.
• The STOP LED starts flashing on
successful OS update. The CPU
requests memory reset.
5. Switch off the CPU power supply
and remove the MC/MMC that
contains the OS update.
-
6. Reinsert the
backup/rechargeable battery into
the respective CPUs.
-
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