Siemens SIMATIC S7-1200

Communication
11.2 PROFINET
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
827
11.2.8.3
Communication services and used port numbers
The S7-1200 CPU supports the protocols listed in the table below. For each protocol, the
CPU assigns the address parameters, the respective communications layer as well as the
communications role, and the communications direction.
This information makes it possible to match the security measures for protection of the
automation system to the used protocols (for example, firewall). Only the Ethernet or
PROFINET networks have security measures. Since PROFIBUS does not have any security
measures, the table does not include any PROFIBUS protocols.
The table below shows the different layers and protocols that the CPU uses:
Protocol
Port number
(2) Link layer
(4) Transport layer
Function
Description
PROFINET protocols
DCP
(Discovery and
Configuration
Protocol)
Not relevant (2) Ethernet II and
IEEE 802.1Q and
Ethertype 0x8892
(PROFINET)
Accessible devic-
es PROFINET
Discovery and
configuration
PROFINET uses
DCP to discover
devices and pro-
vide basic set-
tings.
DCP uses the
special multicast
MAC address: xx-
xx-xx-01-0E-CF,
xx-xx-xx = Organi-
zationally Unique
Indentifier
LLDP
(Link Layer Dis-
covery Protocol)
Not relevant (2) Ethernet II and
IEEE 802.1Q and
Ethertype 0x88CC
(PROFINET)
PROFINET Link
Layer Discovery
protocol
PROFINET uses
LLDP to discover
and manage
neighbor relation-
ships between
PROFINET devic-
es.
LLDP uses the
special multicast
MAC address: 01-
80-C2-00-00-0E