5 Configuring Communication Connections
A-103
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
5.3 Connections
Characteristics of a Connection
A communication connection allows program-controlled communication between
two nodes on Industrial Ethernet with the following characteristics:
The data transfer is bi-directional, in other words, it is possible to transmit and
receive on the connection simultaneously.
Both stations have the same rights, in other words, each station can trigger the
send and receive procedures in response to events.
The address of the communication partner is specified in the configuration.
Exceptions to this are:
- free UDP connections
Here, the address is specified at the FC interface in the user program.
- programmed communication connections (see Chapter 6)
Communication
connection
Ethernet CP
Ethernet
node
SIMATIC S7 station
with Ethernet CP
receive
send
receive
send
Ethernet
node
receive
send
receive
send
Communication
connection
Figure 5-2 Sending and Receiving via one Communication Connection
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