Maintenance
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
9-3
Step Action required CPU Response
5. Mode selector switch briefly to
MRES position, then let it return to
STOP.
• The CPU starts backup of the
operating system to MC/MMC.
• All LEDs are lit during backup.
• The STOP LED flashes to indicate
successful backup. The CPU
requests memory reset.
6. Remove the Memory Card or Micro
Memory Card.
-
9.3 Updating the Operating System
In which situations should I update the operating system?
After (compatible) function expansions or after an enhancement of operating
system performance the operating system should be upgraded to the latest version
(update).
Where do I get the latest version of the operating system?
You can obtain the latest operating system versions from your Siemens partner or
from the Internet (Siemens Homepage; Automation and Drives, Customer
Support).
Tip: Backup your operating system before you update it
Backup your existing operating system to an empty MC/MMC before you start the
update (see previous Chapter). This allows you to reload the "old" operating
system in case you meet any problems.
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