Siemens S7-1200 Operating Instructions Manual page 68

Configuration and operation
4.15 STEP 7 configuration of individual parameters
Ethernet interface (X1) > Advanced options > TCP connection monitoring
The settings made here apply globally to all configured TCP connections of the CP. If
telecontrol communication is enabled, this is the connection to the telecontrol server.
Note the option of overwriting the general value configured here for individual
communications partners, refer to the section Partner stations (Page 70).
(Note: The settings made here do not apply to connections programmed for Open User
Communication with the program blocks.)
TCP connection monitoring time
Function: If there is no data traffic within the connection monitoring time, the CP sends a
keepalive to the communications partner.
The monitoring time is configured for the Ethernet interface as the default for all TCP
connections. The default value can be adapted individually for each connection in "Partner
stations".
TCP keepalive monitoring time
After sending a keepalive, the CP expects a reply from the communications partner within
the keepalive monitoring time. If the CP does not receive a reply within the configured time, it
terminates the connection.
The monitoring time is configured for the Ethernet interface as the default for all TCP
connections. The default value can be adapted individually for each connection in "Partner
stations".
Ethernet interface(X1) > Advanced options > Transfer settings
Reconnection delay
The settings made here apply to the connection to the telecontrol server.
The reconnection delay is the waiting time between repeated attempts to establish the
connection by the CP when the telecontrol server is not reachable or the connection has
aborted.
This waiting time avoids continuous connection establishment attempts at short intervals if
there are connection problems.
A basic value is configured for the waiting time before the next connection establishment
attempt. Starting at the basic value, the current waiting time is doubled after every 3
unsuccessful retries up to a maximum value of 900 s.
Range of values for the basic value: 10 to 600 s.
Example: The basic value 20 results in the following intervals (waiting times) between the
attempts to re-establish a connection:
● three times 20 s
● three times 40 s
● three times 80 s
● etc. up to max. 900 s
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Operating Instructions, 01/2015, C79000-G8976-C381-01
CP 1243-7 LTE