Siemens SIMATIC ET 200AL - Page 710

Communications services
3.2 Communications protocols and port numbers used for Ethernet communication
Communication
24 Function Manual, 12/2017, A5E03735815-AF
Protocol
Port number
(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 devices
via Ethernet.
PROFINET
Context Manager
34964 (4) UDP PROFINET connection
less RPC
The PROFINET Context Manager pro-
vides an endpoint mapper in order to
establish an application relation
(PROFINET AR).
Connection-oriented communications protocols
SMTP
Simple mail trans-
fer protocol
25 (4) TCP Simple mail transfer
protocol
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 connections.
SMTP with
STARTTLS
25
587
(4) TCP Simple mail transfer
protocol with the
SMTP command
"STARTTLS"
SMTP with STARTTLS is used for send-
ing e-mails over secure connections.
HTTP
Hypertext transfer
protocol
80 (4) TCP Hypertext transfer
protocol
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 message-oriented data ex-
change with remote CPU or software
controller.
S7 communication with ES, HMI, OPC
server, etc.
NTP
Network time pro-
tocol
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 network
management pro-
tocol
161
162 (trap)
(4) UDP Simple network man-
agement protocol
SNMP is used for reading and setting of
network management data (SNMP
managed Objects) by the SNMP Man-
ager.
HTTPS
Secure Hypertext
transfer protocol
443 (4) TCP Secure Hypertext
transfer protocol
HTTPS is used for communication with
the CPU-internal web server via Secure
Socket Layer (SSL).
Modbus
TCP
Modbus
Transmission Con-
trol Protocol
502 (4) TCP Modbus/TCP protocol Modbus/TCP is used by
MB_CLIENT/MB_SERVER instructions
in the user program.
OPC UA
Open Platform
Communications
Unified Architec-
ture
4840 (4) TCP Based on the TCP/IP
protocol
Communication standard ranging from
the enterprise level to the field level.