Communications services
3.2 Communications protocols and port numbers used for Ethernet communication
Communication
30
Function Manual, 05/2021, A5E03735815-AJ
Protocol
Port num-
ber
(2) Link layer
(4) Transport
layer
Function
Description
OUC
1
Open User
Communica-
tion
and
Secure OUC
1 ... 1999
can be used
to limited
extent
2
(4) TCP
(4) UDP
Open User
Communica-
tion
(TCP/UDP)
Secure Open
User Commu-
nication (TLS)
OUC instructions provide connection establishment,
connection termination and data transfer based on the
socket layer.
2000 ...
5000
Recom-
mended
5001 ...
49151
can be used
to limited
extent
2
IGMPv2
Internet Group
Management
Protocol
Not relevant (3) Network layer Internet Group
Management
Protocol
Network protocol for the organization of multicast
groups.
Reserved
49152 ...
65535
(4) TCP
(4) UDP
-
Dynamic port area used for active connection end
point if the application does not determine the local
port number.
1
Note: The open communication provides direct access to the UDP/TCP for the user. The user is responsible for observing
the port restrictions/definitions of the IANA (Internet Assigned Numbers Authority).
2
Do not use ports for OUC, which are already used by other protocols
.
The following table shows the protocols that are supported by the S7-1500 software
controller via the Ethernet interfaces assigned to Windows.
Table 3- 3
Layers and protocols of the S7-1500 Software Controller (via Ethernet interface on the Windows side)
Protocol
Port num-
ber
(2) Link layer
(4) Transport
layer
Function
Description
PROFINET protocols
DCP
Discovery and
basic configu-
ration protocol
Not relevant (2) Ethertype
0x8892
(PROFINET)
Accessible
devices
PROFINET
Discovery and
configuration
DCP is used by PROFINET to discover PROFINET devices
and provide basic settings.
Connection-oriented communications protocols
SMTP
Simple mail
transfer proto-
col
25
(4) TCP
Simple mail
transfer proto-
col
SMTP is used for sending e-mails.
HTTP
Hypertext
transfer proto-
col
Adjustable
1
(4) TCP
Hypertext
transfer proto-
col
HTTP is used for communication with CPU-internal web
server. You can change the port number to avoid con-
flict with other web servers on Windows.
If you want to use web server access, you must acti-
vate the port in the Windows Firewall.
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