Communications services
3.2 Communications protocols and port numbers used for Ethernet communication
Communication
Function Manual, 05/2021, A5E03735815-AJ
31
Protocol
Port num-
ber
(2) Link layer
(4) Transport
layer
Function
Description
ISO-on-TCP
(according to
RFC 1006)
102
(4) TCP
ISO-on-TCP
protocol
ISO-on-TCP (according to RFC 1006) for S7 communi-
cation with PG/PC or HMI.
OUC
2
Open User
Communica-
tion
and
Secure OUC
1 ... 1999
can be used
to limited
extent
3, 4
(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.
If you want to use OUC, you must activate the ports in
the Windows Firewall.
2000 ...
5000
recom-
mended
4
5001 ...
49151
can be used
to limited
extent
3, 4
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 range that is used for the active connec-
tion end point, if the application does not determine
the local port number.
If you wish to use this communication, you must acti-
vate the ports in the Windows Firewall.
1
Default setting for Windows assigned interfaces: 81
2
Note: The open user communication provides direct access to the UDP/TCP for the user. The user is responsible for ob-
serving the port restrictions/definitions of the IANA (Internet Assigned Numbers Authority).
3
Do not use ports for OUC, which are already used by other protocols.
4
Do not use ports for OUC, which are already used by other Windows applications.
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