Siemens SIMATIC ET 200AL - Page 712

Communications services
3.2 Communications protocols and port numbers used for Ethernet communication
Communication
26 Function Manual, 12/2017, A5E03735815-AF
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 number
(2) Link layer
(4) Transport layer
Function
Description
PROFINET protocols
DCP
Discovery and con-
figuration 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 trans-
fer protocol
25 (4) TCP Simple mail transfer
protocol
SMTP is used for sending e-mails.
HTTP
Hypertext transfer
protocol
Adjustable
1
(4) TCP Hypertext transfer
protocol
HTTP is used for communication with
CPU-internal web server. You can
change the port number to avoid conflict
with other web servers on Windows.
If you want to use web server access,
you must activate the port in the Win-
dows Firewall.
ISO-on-TCP
(according to
RFC 1006)
102 (4) TCP ISO-on-TCP protocol ISO-on-TCP (according to RFC 1006)
for S7 communication with PG/PC or
HMI.
OUC
2
Open User Com-
munication
and
Secure OUC
1 ... 1999
can be used
to limited
extent
3, 4
(4) TCP
(4) UDP
Open User Communi-
cation
(TCP/UDP)
Secure Open User
Communication (TLS)
OUC instructions provide connection
establishment, connection termination
and data transfer based on the socket
layer.
If you want to use OUC, you must acti-
vate the ports in the Windows Firewall.
2000 ...
5000
recom-
mended
4
5001 ...
49151
can be used
to limited
extent
3, 4