Siemens S7-300 - Page 104

Configuring communications connections
5.6 Configuring TCP connection properties
Configuring and commissioning S7 CPs for Industrial Ethernet
104 Configuration Manual, 09/2013, C79000-G8976-C182-13
Port addresses
Application / note
0
Fixed; must not be modified!
1..1023 Default assignment; should not be used (well-
known ports)
1024...49151
Ports for application-specific protocols
2000...5000 Range used by the configuration tool in which a
free port address is searched for and assigned.
You can set the port address individually in this
range.
5001...49151 Port addresses as of 5000 are used by the
system!
Note:
If the partner uses a port in this area for active
connection establishment, change the port of the
partner where possible in a range <5000.
49152...65535 Dynamically assigned ports
It is not advisable to use these ports.
The following local port numbers are reserved. You should not use this in the connection
configuration.
Table 5- 4 Reserved port numbers
Port number
Protocol
Service
20, 21 TCP FTP
25
TCP
SMTP
80 TCP HTTP
102
TCP
RFC1006
135
TCP
RPC-DCOM
443
TCP
HTTPS
502
TCP
ASA application protocol