Siemens SIMATIC S7-1500 Function Manual page 27

Communications services
3.2 Communications protocols and port numbers used for Ethernet communication
Protocol Port num-
ber
IGMPv2 Not relevant (3) Network layer
Internet Group
Management
Protocol
Reserved 49152 ...
65535
Default setting for Windows assigned interfaces: 81
1
Note: The open user communication provides direct access to the UDP/TCP for the user. The user is responsible for
2
observing the port restrictions/definitions of the IANA (Internet Assigned Numbers Authority).
Do not use ports for OUC, which are already used by other protocols.
3
Do not use ports for OUC, which are already used by other Windows applications.
4
The following table shows the protocols that are supported in addition to those listed in the
tables for the S7-1500 communications modules (e.g. CP 1543-1).
Table 3- 4 Layers and protocols of S7-1500 communications modules
Protocol Port number
PROFINET/Industrial Ethernet protocols
Connection-oriented communications protocols
FTP 20 (data)
File transfer 21 (control)
protocol
secureFTP 20 (data)
File transfer 21 (control)
protocol
DHCP 68
Dynamic Host
Configuration
Protocol
Secure NTPv3 123
Network time
protocol
SNMP 161
Simple net- 162 (trap)
work man-
agement
protocol
Special consideration S7-1500 MFP:
Port 111: The S7-1500 MFP uses Port 111 to the NFS service for internal communication.
26
(2) Link layer Function
(4) Transport
layer
Internet Group Man-
agement Protocol
(4) TCP -
(4) UDP
(2) Link layer Function
(4) Transport layer
(4) TCP File transfer proto-
col
(4) TCP File transfer proto-
col
(4) UDP Dynamic Host
Configuration Pro-
tocol
(4) UDP Network time pro-
tocol
(4) UDP Simple network
management pro-
tocol
Description
Network protocol for the organization of mul-
ticast groups.
Dynamic port range that is used for the active
connection end point, if the application does
not determine the local port number.
If you wish to use this communication, you
must activate the ports in the Windows Fire-
wall.
Description
FTP is used for the transmission of files (only
in connection with CP 1543-1).
SecureFTP is used for the transmission of
files by means of a TSL connection (only in
connection with CP 1543-1).
DHCP is used to retrieve the IP Address Suite
from a DHCP server when starting up the IE
interface.
Secure NTP is used to synchronize the CP
1543-1 internal system clock with an NTP
server.
SNMPv3 permits the CP 1543-1 to read net-
work management data (MIBs) from SNMPv3
agent with authentication.
Function Manual, 11/2019, A5E03735815-AH
Communication