Siemens S7-300 Configuration Manual page 81

Downloading the connection configuration
To download configured connections, you will need to make a download in the connection
configuration (NetPro).
Note
If you have assigned a new address to the Ethernet CP, you always need to download the
connection configuration again.
Note that you will need to make address adaptations even for the other stations or
"substitute objects".
Moving the CP in the hardware configuration
If you use communication services with configured connections, these connections are
linked to the slot of the CP based on connection IDs. You should therefore note the following
information if you move a CP that has already been configured by "dragging" it to a different
slot.
Note
If the CP has been moved to a different slot by "dragging", the data of the connection
configuration is automatically updated. The data of the connection configuration nevertheless
needs to be downloaded again!
Configuring and commissioning S7 CPs for Industrial Ethernet
Configuration Manual, 09/2013, C79000-G8976-C182-13
Configuring the Ethernet CP with STEP 7
3.7 Downloading the configuration data to the target system
81