Calling A Teleservice Connection - Siemens SIMATIC NETS7-1200 Operating Instructions Manual

Communications partner is a telecontrol server
The reaction of the CP after data is sent from the CPU to the CP depends on the setting of
the RemeoteWdcAddress parameter of the TCON_WDC data block:
● Immediate transfer of process data to the telecontrol server
● No transfer to the telecontrol server
The two communications options with the telecontrol server described above can also be
used at the same time on the CP. To achieve this, two different TC_CON instructions must
be called.
Data buffering when there is a connection abort
If the connection partner is the telecontrol server, the following applies:
If the wireless network fails, the CP stores up to 1000 send jobs with time stamps and sends
these the next time the connection is established.
4.6

Calling a TeleService connection

Requirement for the engineering station
The STEP 7 project with the CP 1242-7 is stored on the engineering station.
CP 1242-7
Operating Instructions, 09/2011, C79000-G8976-C247-02
The CP compares the new process data with the image last sent to the telecontrol server
and writes the new data to the image.
If the data in the image of the CP has changed, the CP immediately sends all the data of
the image to the telecontrol server.
In this case, the following initial value must be assigned as the address in the memory
area of the CP in the TCON_WDC data block for the RemoteWdcAddress parameter
(access ID):
W#16#0
At the request of the telecontrol server, for example after a request by an OPC client, the
CP sends the entire data from its image to the telecontrol server.
The CP does not compare the new process data with the previous image, but writes the
new data to the image. Only after the telecontrol server sends a request to the CP does
the CP send all the data of the image to the telecontrol server.
In this case, the following initial value must be assigned as the address in the memory
area of the CP in the TCON_WDC data block for the RemoteWdcAddress parameter
(access ID):
W#16#FEEDDADA
In this case, if the CP is queried by the telecontrol server, for example after a request by
an OPC client, the CP sends the current data from its image.
This option is particularly suitable for cyclic data exchange initiated by a request from the
telecontrol server ("cyclic communication") to supply data archives with data at fixed
intervals.
Notes on operation
4.6 Calling a TeleService connection
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