Siemens S7-400 Equipment Manual page 91

How to use the functions
You can start the memory reset functions in STEP 7. The CP must be in STOP. When you reset
memory using special diagnostics, the CP is automatically changed to STOP.
• Memory reset
– In STEP 7 V5.5 with the menu command "PLC" > "Clear/Reset"
– In STEP 7 special diagnostics with the "Operating Mode" > "Clear/Reset Module" menu
– In STEP 7 Professional -> with STEP 7 special diagnostics
• Resetting to factory settings
– In STEP 7 V5.5 with the menu command "PLC" > "Edit Ethernet Node..." > Select CP >
– In STEP 7 special diagnostics with the "Operating Mode" > "Reset to Factory Settings"
– In STEP 7 Professional with "Online" > "Online & Diagnostics" > "Functions" > "Reset to
Clear/reset module - effects
After resetting memory, the CP retains the configured MAC address, the IP address and the
retentive parameters (for information on the retentive parameters, refer to section CPLUG
(configuration plug) (Page 49)). The CP is therefore immediately ready for downloads using
the IP address.
The configuration data is retained on the CPU.
The CPU in the S7 station does not recognize that the CP memory was reset. The CP changes
to the "stopped with error" state (see section LEDs (Page 37)). The configuration data must
then be reloaded. You can also initiate this loading by cycling power (OFF > ON).
This has the following overall effect:
CP 443-1 Advanced
Equipment Manual, 03/2023, C79000-G8976-C256-07
command
"OK" > "Reset to Factory Defaults"
menu command
Factory Settings"
Diagnostics and upkeep
7.3 Maintenance
91