Siemens S7-1200 Operating Instructions Manual page 69

Note
If the partner cannot be reached, connection establishment via the mobile wireless network
can take several minutes. This may depend on the particular network and current network
load.
Depending on your contract, costs may result from each connection establishment attempt.
Send timeout
Time for the arrival of the acknowledgment from the telecontrol server after sending
unsolicited frames. The time is started after sending an unsolicited frame. If no
acknowledgement has been received from the partner when the connection monitoring time
elapses, the frame is repeated up to three times. After three unsuccessful attempts, the
connection is terminated and re-established.
Watchdog cycle
Interval at which a watchdog frame is sent to the telecontrol server if there is no productive
data exchange.
Watchdog monitoring time
After sending a watchdog frame, an answer is expected from the Telecontrol server within
the watchdog monitoring time (timeout). If the CP does not receive a reply from the
Telecontrol server within the monitoring time, it terminates and re-establishes the
connection.
Key exchange interval
Here, you enter the interval in hours after which the key is exchanged again between the CP
and the telecontrol server. The key is a security function of the telecontrol protocol used by
the CP and TCSB V3.
CP 1243-7 LTE
Operating Instructions, 01/2015, C79000-G8976-C381-01
4.15 STEP 7 configuration of individual parameters
Configuration and operation
69