ANSWER:
You are using one of the following multiprotocol communications processors, via which you want to download the configuration into the IE-CP:

CP 443-1 A2	6GK7 443-1EX10-0XE0	(V1.0.0 and higher)
CP 443-1 A2	6GK7 443-1EX11-0XE0	(V1.0.0 and higher)
CP 443-1 IT	6GK7 443-1GX10-0XE0	(V1.0.0 and higher)
CP 443-1 IT	6GK7 443-1GX11-0XE0	(V1.0.0 and higher)

All stations are connected via an Industrial Ethernet communications process to the LAN (local area network).
In this case it is possible to provide all stations centrally with a configuration via this LAN.

Note:
If a communications process is in "STOP" mode, then no other modules can be reached via the LAN via the K bus in the same rack. This applies both for downloading processes and for diagnostics connections.

However, the CP itself can be diagnosed in the STOP mode. If data management is on the CP and the CPU is therefore not the carrier of the configuration data, then the configuration for the communications processor can also be downloaded via the LAN in STOP mode.

Example:
A station is available with an S7-400 CPU and an Industrial Ethernet CP. The data management is in the communications processor itself. After triggering the download process from the hardware configuration, the following dialog is displayed:



Since the data management is in the communications processor and this is in "STOP", only the CP 443-1 can be selected as component to be downloaded. The download process starts but is very quickly aborted with the following warning message:



Cause:
No connection to the CPU can be set up to generate the system data. The connection is necessary, because the downloading tool generates new system data blocks (SDBs) in the hardware configuration when downloading the configuration. In doing so it reads the numbers of the SDBs already available in the CPU. This is to prevent that a station is generated twice with the same number for different SDBs. Without this consistency check there could be an SDB with the identical both on the CPU and on the CP. This would not have any negative effects as such, but is not desirable for the overall concept of maintaining data consistency.

Remedy:
If a CP is to be downloaded despite the "STOP" mode, then you can ignore the message. The station will still start up properly afterwards.
This procedure can be useful, for example, to interrupt communications to other CPs when changing the parameters of the communications processor.

Note:
After such a download you should still reload the complete station to ensure station-wide consistency in compliance with STEP 7 philosophy.

Keywords:
Hardware configuration, Download, Operating mode