Free Udp Connection - Siemens S7-300 Configuration Manual

Configuring communications connections
5.7 Configuring UDP connection properties
5.7.3

Free UDP connection

Program-controlled addressing
A free UDP connection allows program-controlled addressing of the communications partner.
Communication between two nodes on Industrial Ethernet has the following properties:
● Data transfer is bi-directional; in other words it is possible to send and receive on the
UDP connection at the same time.
● The local node is specified in the configuration. The remote node is entered in the job
header of the job buffer by the user program when it calls AG_SEND. This allows any
node on Ethernet/LAN/WAN to be reached.
● The IP address and the port of the sender can be read from the job header of AG_RECV.
For information on the structure of the job header, refer to "Program blocks for the
SEND/RECEIVE interface" in /10/ (Page 230).
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The following IP addresses address the same multicast group.
①
IP address
②
Resulting multicast address
The resulting MAC addresses are:
01.00.5E.XX.XX.XX
The filtering on the CP as described above ensures, however, clear identification of
the addressed multicast group. Due to the check, it is not possible, for example, to
receive frames in a configured multicast group with the address 224.0.1.0 that are
sent to the address 225.0.1.0.
Configuring and commissioning S7 CPs for Industrial Ethernet
Configuration Manual, 09/2013, C79000-G8976-C182-13