Communications services
3.2 Communications protocols and port numbers used for Ethernet communication
Communication
24 Function Manual, 11/2019, A5E03735815-AH
(2) Link layer
(4) Transport layer
Modbus
TCP
Modbus
Transmission
Control Proto-
502 (4) TCP Modbus/TCP protocol Modbus/TCP is used by
MB_CLIENT/MB_SERVER instructions
in the user program.
OPC UA
Open Platform
Communica-
tions
Unified Archi-
4840 (4) TCP Based on the TCP/IP proto-
col
Communication standard ranging from
the enterprise level to the field level.
OUC
1
Open User
Communica-
tion
and
Secure OUC
1 ... 1999
can be used
to limited
2
(4) TCP
(4) UDP
Open User Communication
(TCP/UDP)
Secure Open User Com-
munication (TLS)
OUC instructions provide connection
establishment, connection termination
and data transfer based on the socket
layer.
2000 ...
5000
Recom-
5001 ...
49151
can be used
to limited
extent
2
IGMPv2
Internet Group
Management
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 con-
nection end point if the application does
not determine the local port number.
Note: The open communication provides direct access to the UDP/TCP for the user. The user is responsible for observ-
ing 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
.
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