Siemens Simatic S7-400 - Calculating Working Memory; Memory Types

Diagnostics and maintenance
6.5 Memory reset / reset to factory defaults
CP 443-1 OPC UA
124 Operating Instructions, 01/2017, C79000-G8976-C427-02
What to do if a download is interrupted
Disturbances or collisions on the network can lead to packets being lost. In such cases, this
can lead to an interruption of the firmware download. The CP writes an entry in the
diagnostics buffer.
Repeat the download after the CP has started up again.
If you cannot start the download again following an aborted attempt, turn off the entire rack
and turn it on again. You can then restart the firmware download.
6.5
Memory reset / reset to factory defaults
The CP has a two level function available for resetting:
● Memory reset
● Resetting to factory settings
Note
Data on the CP is deleted - CPU data is retained
The functions for resetting and resetting to factory defaults described here do not change
the configuration data on the CPU! Only the data kept on the CP (RAM areas) is del
eted.
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).
If you have configured a protection level for the CP, note the information in section "Options"
tab: Effects of protection levels (Page 52).
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 command
– In STEP 7 Basic/Professional via "Online & diagnostics" > "Go online" > "Online tools"
> open input box > button "MRES"
●
Resetting 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 Professional in the Online & Diagnostics view using the parameter group "
> "Functions" > "Reset to Factory Settings"
– In STEP 7 special diagnostics with the "Operating Mode" > "Reset to Factory Settings"
menu command