Procedure And Connection Properties - Siemens S7-300 Configuration Manual

Configuring communications connections

5.1 Procedure and connection properties

5.1 Procedure and connection properties
Setting up connections and using them in the user program
The following steps are necessary to operate connections in the SIMATIC S7 PLC with the
Ethernet CP:
Properties of the connection
A communications connection allows program-controlled communication between two nodes
on Industrial Ethernet with the following properties:
● Data transfer is bi-directional; in other words it is possible to send and receive on the
connection at the same time.
● Both nodes have the same rights, in other words each node can trigger the send or
receive procedure dependent on events.
● The address of the communication partner is specified in the configuration.
The following is an exception:
– The free UDP connection
– The communications connection programmed with FB55 in the user program (see /10/
92
Here, the address is specified at the FC interface in the user program.
(Page 230))
Configuring and commissioning S7 CPs for Industrial Ethernet
Configuration Manual, 09/2013, C79000-G8976-C182-13