Siemens SIMATIC NET S7-300 Manual page 137

Addresses Tab - Unspecified TCP Connection
If you select the partner type as "unspecified", depending on your task, you can
enter address information about the communication partner here. The options
available to you are explained in detail in Section 5.3.1.
The Addresses tab shown here illustrates the situation in which the remote port but
not the IP address was specified. If you make no further entries, you are accepting
connection establishment with any communication partner that uses the specified
port.
Figure 5-17
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
5 Configuring Communication Connections
A -137