Siemens SIMATIC S7-1500 Function Manual page 24

Protocol Port num-
ber
PTCP Not relevant (2) Ethertype
Precision
Transparent
Clock Protocol
PROFINET IO Not relevant (2) Ethertype
data
PROFINET 34964
Context Man-
ager
Connection-oriented communications protocols
SMTP 25
Simple mail
transfer proto-
col
SMTPS 465
(SMTP 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
Communication
Function Manual, 11/2019, A5E03735815-AH
3.2 Communications protocols and port numbers used for Ethernet communication
(2) Link layer Function
(4) Transport layer
PROFINET
0x8892
send clock and time syn-
(PROFINET)
chronization, based on
IEEE 1588
PROFINET Cyclic IO data
0x8892 transfer
(PROFINET)
(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 protocol
(4) TCP ISO-on-TCP protocol
(4) UDP Network time protocol
(4) UDP Simple network manage-
ment protocol
(4) TCP Secure Hypertext transfer
protocol
Communications services
Description
PTCP provides a time delay measure-
ment between RJ45 ports and thus send
clock synchronization and time synchro-
nization.
PTCP uses standard-compliant Multicast
MAC addresses.
The PROFINET IO frames are used to
transmit IO data cyclically between
PROFINET IO controller and IO devices
via Ethernet.
The PROFINET Context Manager pro-
vides 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 connections.
SMTP with STARTTLS is used for send-
ing 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 message-oriented data ex-
change 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 management data (SNMP
managed Objects) by the SNMP Man-
ager.
HTTPS is used for communication with
the CPU-internal web server via Secure
Socket Layer (SSL).
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