Siemens SIMATIC ET 200AL System Manual page 1161

Functions
5.8 Device replacement without exchangeable medium
How the "Permit overwriting of PROFINET device names of all assigned IO devices" option works
The IO controller (CPU) can overwrite the PROFINET device names of IO devices in the
IO system when the "Permit overwriting of PROFINET device names of all assigned IO
devices" option is enabled.
Multiple use IO systems can only be operated when this option is enabled. The IO controller
checks prior to overwriting if the type of the IO device matches the configured type.
If the option is not selected, the IO controller cannot overwrite the device names of the
IO devices. In this case, you must manually assign the PROFINET device name on the
IO device if the PROFINET device name changes in the configuration or when a device is
replaced, or delete the device names of the IO devices prior to an automatic commissioning.
Response during commissioning
Select the option "Permit overwriting of PROFINET device names of all assigned IO devices"
only if the following requirements are fulfilled:
● All the configured IO devices are available.
● All IO devices are wired correctly in accordance with the topology configuration.
● No IO device is jumpered.
If configured IO devices are missing or are jumpered (partial commissioning), do not use the
option.
Error at partial commissioning
If device names are assigned incorrectly during partial commissioning or incorrect wiring,
these have to be deleted manually after a correction of the wiring in order to attain correct
assignment of the device names.
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CAUTION
PROFINET with STEP 7 V15
Function Manual, 12/2017, A5E03444486-AH