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

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 security measures
are limited to Ethernet or PROFINET networks, the tables do not include PROFIBUS
protocols.
Note
Port numbers used
The port numbers used are the standard port numbers used by the S7-1500 CPU. Many
communication protocols and implementations enable you to use other port numbers.
The tables below show the different layers and protocols that are being used.
The following table shows the protocols supported by the S7-1500 CPUs, ET 200SP CPUs
and the CPU 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 number (2) Link layer
PROFINET protocols
DCP Not relevant (2) Ethertype
Discovery and con-
figuration protocol
LLDP Not relevant (2) Ethertype
Link Layer Discov-
ery protocol
MRP Not relevant (2) Ethertype
Media Redundancy
Protocol
PTCP Not relevant (2) Ethertype
Precision Trans-
parent Clock Pro-
tocol
Communication
Function Manual, 12/2017, A5E03735815-AF

3.2 Communications protocols and port numbers used for Ethernet communication

Function
(4) Transport layer
Accessible devices
0x8892
PROFINET Discovery
(PROFINET)
and configuration
PROFINET Link Layer
0x88CC (LLDP) Discovery protocol
PROFINET medium
0x88E3 (IEC redundancy
62493-2-2010)
PROFINET
0x8892
send clock and time
(PROFINET)
synchronization, based
on IEEE 1588
Communications services
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 addresses.
PTC 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.
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