Siemens SIMATIC S7-1500 Function Manual page 26

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
PROFINET protocols
DCP Not relevant (2) Ethertype
Discovery and
basic configu-
ration protocol
Connection-oriented communications protocols
SMTP 25
Simple mail
transfer proto-
col
HTTP Adjustable
Hypertext
transfer proto-
col
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
Communication
Function Manual, 11/2019, A5E03735815-AH
3.2 Communications protocols and port numbers used for Ethernet communication
(2) Link layer
(4) Transport
layer
0x8892
(PROFINET)
(4) TCP
(4) TCP
1
(4) TCP
(4) TCP
(4) UDP
4
Function
Accessible devices
PROFINET Discovery
and configuration
Simple mail transfer
protocol
Hypertext transfer
protocol
ISO-on-TCP protocol
Open User Communi-
cation
(TCP/UDP)
Secure Open User
Communication (TLS)
Communications services
Description
DCP is used by PROFINET to discover
PROFINET devices and provide basic set-
tings.
SMTP is used for sending e-mails.
HTTP is used for communication with CPU-
internal web server. You can change the port
number to avoid conflict with other web serv-
ers on Windows.
If you want to use web server access, you
must activate the port in the Windows Fire-
wall.
ISO-on-TCP (according to RFC 1006) for S7
communication with PG/PC or HMI.
OUC instructions provide connection estab-
lishment, 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.
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