Communications services
3.2 Communications protocols and port numbers used for Ethernet communication
Communication
Function Manual, 05/2021, A5E03735815-AJ
29
Protocol
Port num-
ber
(2) Link layer
(4) Transport
layer
Function
Description
PROFINET IO
data
Not relevant (2) Ethertype
0x8892
(PROFINET)
PROFINET
Cyclic IO data
transfer
The PROFINET IO frames are used to transmit IO data
cyclically between PROFINET IO controller and IO de-
vices via Ethernet.
PROFINET
Context Man-
ager
34964
(4) UDP
PROFINET
connection
less RPC
The PROFINET Context Manager provides an endpoint
mapper in order to establish an application relation
(PROFINET AR).
Connection-oriented communications protocols
SMTP
Simple mail
transfer proto-
col
25
(4) TCP
Simple mail
transfer proto-
col
SMTP is used for sending e-mails.
SMTPS (SMTP
over TLS)
465
(4) TCP
Secure SMTP
SMTP is used for sending e-mails over secure connec-
tions.
SMTP with
STARTTLS
25
587
(4) TCP
Simple mail
transfer proto-
col with the
SMTP com-
mand
"STARTTLS"
SMTP with STARTTLS is used for sending e-mails over
secure connections.
HTTP
Hypertext
transfer proto-
col
80
(4) TCP
Hypertext
transfer proto-
col
HTTP is used for communication with the CPU-internal
web server.
ISO-on-TCP
(according to
RFC 1006)
102
(4) TCP
ISO-on-TCP
protocol
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
Network time
protocol
123
(4) UDP
Network time
protocol
NTP is used for synchronization of the CPU system time
with the time of an NTP server.
SNMP
Simple net-
work man-
agement
protocol
161
162 (trap)
(4) UDP
Simple net-
work man-
agement
protocol
SNMP is used for reading and setting of network man-
agement data (SNMP managed Objects) by the SNMP
Manager.
HTTPS
Secure Hyper-
text transfer
protocol
443
(4) TCP
Secure Hyper-
text transfer
protocol
HTTPS is used for communication with the CPU-
internal web server via Secure Socket Layer (SSL).
Modbus
TCP
Modbus
Transmission
Control Proto-
col
502
(4) TCP
Modbus/TCP
protocol
Modbus/TCP is used by MB_CLIENT/MB_SERVER instruc-
tions in the user program.
OPC UA
Open Platform
Communica-
tions
Unified Archi-
tecture
4840
(4) TCP
Based on the
TCP/IP protocol
Communication standard ranging from the enterprise
level to the field level.
Summary of Contents for SIMATIC ET 200AL
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