Siemens SIMATIC NET S7-1500 Operating Instructions Manual page 37

• Default of the port
– Open
– Closed
•
– Open
– Open after configuration
– Open (login, when configured)
– Open with block call
• Authentication
Specifies whether or not the protocol authenticates the communication partner during
access.
Protocol / Port number
function (protocol)
S7 102 (TCP)
communication
HTTP 80 (TCP)
SNMP 161 (UDP)
PROFINET 34964 (UDP)
Ports of communication partners and routers
Make sure that you enable the required client ports in the corresponding firewall on the
communication partners and in intermediary routers.
These can be:
• DHCP / 67, 68 (UDP)
• DNS / 53 (UDP)
• NTP / 123 (UDP)
• SMTP / 25 (TCP) - in the CM open on block call (only outgoing)
SIMATIC CM 1542-1
Operating Instructions, 04/2023, C79000-G8976-C355-05
The port is open at the start of the configuration.
The port is closed at the start of the configuration.
Port status
The port is always open and cannot be closed.
The port is open if it has been configured.
As default the port is open. After configuring the port, the communication partner
needs to log in.
The port is only opened when a suitable program block is called.
Default of the
port
Open
Closed
Open
Open
Port status
Open
Open after configuration
Open
Open
Configuration, program blocks
4.1 Security recommendations
Authentication
No
No
No
No
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