Siemens SIMATIC ET 200AL System Manual page 770

Open User Communication
6.6 Setting up communication over FDL
4. Create a TCON instruction in the program editor.
5. Interconnect the CONNECT parameter of the TCON instruction with the tag of the data
type TCON_FDL.
In the example below, the CONNECT parameter of the TCON instruction is
interconnected with the tag "FDL_Connection" (data type TCON_FDL).
Figure 6-8
84
Example: TCON Instruction for FDL connection
Function Manual, 12/2017, A5E03735815-AF
Communication