Diagnostics and maintenance
7.2 Memory reset / reset to factory defaults
CP 343-1 Lean
Equipment Manual, 01/2023, C79000−G8976−C198−09
59
Available functions
The CP has a twolevel function available for resetting memory:
• Memory reset
Following this memory reset, the CP retains the preset MAC address and the retentive
parameters. The CP is therefore immediately ready for downloads using the IP address.
The retentive parameters include:
– IP address, subnet mask and, if applicable, router address
– LAN settings
• Reset to factory settings
After resetting, the CP only contains the default MAC address (as shipped).
The functions for memory reset and resetting to defaults described here do not change
the configuration data on the CPU!
If you subsequently upload the configuration data
from the CPU to a PG you will always
obtain the configuration data that was previously on the CP (with parameters,
connections, IP address).
How to use the function
You can start the memory reset functions in STEP 7.
• 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
command
– In STEP 7 Professional V11 with STEP 7 special diagnostics
• Reset to factory settings
– In STEP 7 V5.5 with the menu command "PLC" > "Edit Ethernet Node..." > Select CP >
"OK" > "Reset to Factory Defaults"
– In STEP 7 special diagnostics with the "Operating Mode" > "Reset to Factory Settings"
menu command
– In STEP 7 Professional V11 with "Online > Online & Diagnostics > Functions > Reset to
Factory Settings"
Behavior after a memory reset
The CPU in the S7 station does not recognize that the CP memory was reset. The CP therefore
changes to the "Stopped (STOP) with error" state (see LEDs (Page 29)).
The configuration data must then be reloaded. The download of the configuration data can
be initiated by cycling the power supply (OFF → ON).
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