Communications Protocols And Port Numbers Used For Ethernet Communication - Siemens SIMATIC ET 200AL System Manual

Communications services

3.2 Communications protocols and port numbers used for Ethernet communication

3.2 Communications protocols and port numbers used for Ethernet
communication
This section provides an overview of the supported protocols and port numbers used for
communication over PN/IE interfaces. For each protocol the address parameters, the
respective communications layer as well as the communications role and the
communications direction are specified.
This information makes it possible to match the security measures for protection of the
automation system to the used protocols (for example firewall). Because the security
measures are limited to Ethernet or PROFINET networks, the tables do not include PROFIBUS
protocols.
Note
Port numbers used
The specified port numbers are the standard port numbers used by the S7-1500 CPU. Many
communication protocols and implementations enable you to use other port numbers.
The following tables show the different layers and protocols used in the S7-1500 CPUs and S7
1500 communication modules.
The following table shows the protocols supported by the S7-1500 CPUs, ET 200SP CPUs and
the CPUs 1513/1516pro 2 PN. The S7-1500 software controllers also support the protocols
listed in the following table for the Ethernet interfaces that are assigned to the software
controller.
Table 3- 2 Layers and protocols of the S7-1500 CPUs and software controllers (via PROFINET interface of the CPU)
Protocol Port num-
ber
PROFINET protocols
DCP Not relevant (2) Ethertype
Discovery and
basic configu-
ration protocol
LLDP Not relevant (2) Ethertype
Link Layer
Discovery
protocol
MRP Not relevant (2) Ethertype
Media Redun-
dancy Protocol
PTCP Not relevant (2) Ethertype
Precision
Transparent
Clock Protocol
28
(2) Link layer Function
(4) Transport
layer
Accessible
0x8892 devices
(PROFINET)
PROFINET
Discovery and
configuration
PROFINET Link
0x88CC (LLDP) Layer Discov-
ery protocol
PROFINET
0x88E3 (IEC medium re-
62493-2-2010) dundancy
PROFINET
0x8892
send clock and
(PROFINET)
time synchro-
nization, based
on IEEE 1588
Description
DCP is used by PROFINET to discover PROFINET devices
and provide basic settings.
LLDP is used by PROFINET to discover and manage
neighbor relationships between PROFINET devices.
LLDP uses the special multicast MAC address: 01-80-
C2-00-00-0E
MRP provides control of redundant transmission paths
by means of a ring topology.
MRP uses standard-compliant Multicast MAC address-
es.
PTCP provides a time delay measurement between
RJ45 ports and thus send clock synchronization and
time synchronization.
PTCP uses standard-compliant Multicast MAC address-
es.
Function Manual, 05/2021, A5E03735815-AJ
Communication