Siemens SIMATIC ET 200AL System Manual page 1152

Protocol Port num-
ber
ISO-on-TCP 102
(according to
RFC 1006)
OUC 1 ... 1999
2
Open User can be used
Communica- to limited
tion extent
3, 4
and
2000 ...
5000
Secure OUC
recom-
mended
5001 ...
49151
can be used
to limited
extent
3, 4
IGMPv2 Not relevant (3) Network layer
Internet Group
Management
Protocol
Reserved 49152 ...
65535
Default setting for Windows assigned interfaces: 81
1
Note: The open user communication provides direct access to the UDP/TCP for the user. The user is responsible for ob-
2
serving the port restrictions/definitions of the IANA (Internet Assigned Numbers Authority).
Do not use ports for OUC, which are already used by other protocols.
3
Do not use ports for OUC, which are already used by other Windows applications.
4
Communication
Function Manual, 05/2021, A5E03735815-AJ
3.2 Communications protocols and port numbers used for Ethernet communication
(2) Link layer
(4) Transport
layer
(4) TCP
(4) TCP
(4) UDP
4
(4) TCP
(4) UDP
Function Description
ISO-on-TCP ISO-on-TCP (according to RFC 1006) for S7 communi-
protocol cation with PG/PC or HMI.
Open User OUC instructions provide connection establishment,
Communica- connection termination and data transfer based on the
tion socket layer.
(TCP/UDP) If you want to use OUC, you must activate the ports in
the Windows Firewall.
Secure Open
User Commu-
nication (TLS)
Internet Group Network protocol for the organization of multicast
Management groups.
Protocol
- 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.
Communications services
31