Siemens SIMATIC ET 200AL, System Manual

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Communications services
3.2 Communications protocols and port numbers used for Ethernet communication
Communication
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Function Manual, 05/2021, A5E03735815-AJ
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
(2) Link layer
(4) Transport
layer
Function Description
PROFINET protocols
DCP
Discovery and
basic configu-
ration protocol
Not relevant (2) Ethertype
0x8892
(PROFINET)
Accessible
devices
PROFINET
Discovery and
configuration
DCP is used by PROFINET to discover PROFINET devices
and provide basic settings.
LLDP
Link Layer
Discovery
protocol
Not relevant (2) Ethertype
0x88CC (LLDP)
PROFINET Link
Layer Discov-
ery protocol
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
Media Redun-
dancy Protocol
Not relevant (2) Ethertype
0x88E3 (IEC
62493-2-2010)
PROFINET
medium re-
dundancy
MRP provides control of redundant transmission paths
by means of a ring topology.
MRP uses standard-compliant Multicast MAC address-
es.
PTCP
Precision
Transparent
Clock Protocol
Not relevant (2) Ethertype
0x8892
(PROFINET)
PROFINET
send clock and
time synchro-
nization, based
on IEEE 1588
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.