Siemens S7-1200 TELECONTROL Operating Instructions Manual page 55

● TCP keepalive monitoring time
If the value configured here differs from the value configured in the Ethernet interface
parameter group, the monitoring time of the "Partner stations" parameter group is used.
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.
Default setting: 180 s. Permitted range: 1...65535 s.
– The parameter below the Ethernet interface
– The parameter below "Partner stations"
● Connection mode
In the "Permanent" connection mode, there is a permanent connection to the
communications partner.
The CP only supports this connection mode.
● Connection establishment
Specifies the communications partner that establishes the connection (always the CP).
● Partner port
Number of the listener port of the telecontrol server.
Partner stations > "Telecontrol server" > "Advanced settings"
● Report partner status
If the "Report partner status" function is enabled, the CP signals the status of the
communication to the remote partner.
– Bit 0 of "PLC tag for partner status" (data type WORD) is set to 1 if the partner can be
– Bit 1 is set to 1 if all the paths to the remote partner are OK (useful with redundant
– Bits 2-3 indicate the status of the send buffer (frame memory).
Bits 4 to 15 of the PLC tags are not used and do not need to be evaluated in the program.
CP 1242-7 GPRS V2
Operating Instructions, 10/2016, C79000-G8976-C311-02
The monitoring time is configured for the Ethernet interface as a global setting for all
TCP connections.
As with the TCP connection monitoring time, the value of "Partner stations" can be
adapted for each partner individually.
reached.
paths).
The following values are possible:
- 0: Send buffer OK
- 1: Send buffer threatening to overflow (more than 80 % full).
- 3: Send buffer has overflowed (fill level 100 % reached).
As soon as the fill level drops below 50%, bits 2 and 3 are reset to 0.
Configuration and operation
4.9 STEP 7 configuration
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