Siemens S7-300 Configuration Manual page 97

Note
CP replacement
If a CP is replaced by a different CP then it must provide at least the same services and
have at least the same version. This is the only way to ensure that the connections
configured via the CP remain consistent and can be used.
behavior in STEP 7 V5.5
Table 5- 2 Actions for a CP interface that can cause changes in configured connections
Action
The CP (module) is moved to a
different location in the
hardware configuration (drag
and drop)
Delete the CP (module) in the
hardware configuration.
You receive the message: "CP
has n connections; the
assignment will be lost in the
connection table".
Delete the SIMATIC S7 station. All the connections to this station are
Configuring and commissioning S7 CPs for Industrial Ethernet
Configuration Manual, 09/2013, C79000-G8976-C182-13
5.3 Inconsistent connections - connections without assignment
Consequence for the connections
The connections are retained.
The connection IDs are automatically
updated.
The connections remain intact in the
connection table without assignment to
a CP. In the "Overview" tab of the
Properties dialog, the connections are
identified with "!".
deleted in the project.
Note:
does not apply to connections on the
partner if this uses a router.
Configuring communications connections
What you must do to restore the connection
- no action required -
After you have placed and networked a CP in
the hardware configuration:
1. Assign the CP to the connection in the
properties dialog for the connection in the
"Addresses" tab;
or
reassign the connection with the Edit >
Connection partner function.
2. Check the module start address LADDR
and customize if necessary in the user
program.
3. Customize the connection IDs in the user
program.
4. Reload the connection configuration into the
CP.
Reconfigure the station and connections.
97