Siemens SIMATIC ET 200AL System Manual page 1150

Protocol Port num-
ber
PROFINET IO Not relevant (2) Ethertype
data
PROFINET 34964
Context Man-
ager
Connection-oriented communications protocols
SMTP 25
Simple mail
transfer proto-
col
SMTPS (SMTP 465
over TLS)
SMTP with 25
STARTTLS 587
HTTP 80
Hypertext
transfer proto-
col
ISO-on-TCP 102
(according to
RFC 1006)
NTP 123
Network time
protocol
SNMP 161
Simple net- 162 (trap)
work man-
agement
protocol
HTTPS 443
Secure Hyper-
text transfer
protocol
Modbus 502
TCP
Modbus
Transmission
Control Proto-
col
OPC UA 4840
Open Platform
Communica-
tions
Unified Archi-
tecture
Communication
Function Manual, 05/2021, A5E03735815-AJ
3.2 Communications protocols and port numbers used for Ethernet communication
(2) Link layer Function
(4) Transport
layer
PROFINET
0x8892 Cyclic IO data
(PROFINET) transfer
(4) UDP PROFINET
connection
less RPC
(4) TCP Simple mail
transfer proto-
col
(4) TCP Secure SMTP
(4) TCP Simple mail
transfer proto-
col with the
SMTP com-
mand
"STARTTLS"
(4) TCP Hypertext
transfer proto-
col
(4) TCP ISO-on-TCP
protocol
(4) UDP Network time
protocol
(4) UDP Simple net-
work man-
agement
protocol
(4) TCP Secure Hyper-
text transfer
protocol
(4) TCP Modbus/TCP
protocol
(4) TCP Based on the
TCP/IP protocol
Description
The PROFINET IO frames are used to transmit IO data
cyclically between PROFINET IO controller and IO de-
vices via Ethernet.
The PROFINET Context Manager provides an endpoint
mapper in order to establish an application relation
(PROFINET AR).
SMTP is used for sending e-mails.
SMTP is used for sending e-mails over secure connec-
tions.
SMTP with STARTTLS is used for sending e-mails over
secure connections.
HTTP is used for communication with the CPU-internal
web server.
ISO-on-TCP (according to RFC 1006) is used for mes-
sage-oriented data exchange with remote CPU or
software controller.
S7 communication with ES, HMI, OPC server, etc.
NTP is used for synchronization of the CPU system time
with the time of an NTP server.
SNMP is used for reading and setting of network man-
agement data (SNMP managed Objects) by the SNMP
Manager.
HTTPS is used for communication with the CPU-
internal web server via Secure Socket Layer (SSL).
Modbus/TCP is used by MB_CLIENT/MB_SERVER instruc-
tions in the user program.
Communication standard ranging from the enterprise
level to the field level.
Communications services
29