Siemens SIMATIC S7-1200 CP 1243-8 IRC Operating Instructions Manual page 73

If the router can be reached via a dynamic IP address, there must be at least a reachable
DNS server in the network.
● MSC port of the router
The port number is preset. If necessary, you can change the port number. Note that the
port number of both partners must be identical. The port number cannot be configured for
the station.
Default setting: 26382. Permitted range: 1024...65535
● Host name
If the router should be reachable using the host name enter it here.
● IP address DNS server
Here, enter the addresses of the DNS servers in the subnet.
MSC monitoring settings
The description applies to the parameter group of an Ethernet interface with the Network
node type "Master station". The parameter group is disabled for the CP.
● MSC monitoring time
Monitoring time (minutes) for the MSC connection
– Behavior of the master station:
– Behavior of the master station:
Default setting: 10. Permitted range: 0...65535
If you enter 0 (zero), the function is disabled.
● Collect data volume
If the option is enabled, the MSC master passes the monthly transferred data volume of
the stations to online diagnostics.
MSCsec protocol
The parameter group is only active when the setting of the Network node type of the
interface is "Station" or "Node station".
● Activate security protocol MSCsec
If the option is enabled, the secure version of the MSC protocol "MSCsec" is used.
● Key exchange interval
Time (h) after which the secret key is renewed between the MSC station and master
station.
Default setting: 0. Permitted range: 0...255
CP 1243-8 IRC
Operating Instructions, 02/2018, C79000-G8976-C385-03
If there is no data traffic between the MSC master and station within the monitoring
time, the MSC master sends a sign of life frame to the station.
If no sign of life message comes from the MSC master within the monitoring time, the
station sets all subscribers reachable via MSC as disrupted.
Configuration
4.8 Ethernet interface
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