Open User Communication
6.11 Secure Open User Communication
Communication
96 Function Manual, 12/2017, A5E03735815-AF
Requirements:
● Current date and time are set in the CPU.
● Your network includes at least one DNS server.
● You have configured at least one DNS server for the S7-1500 CPU.
● TLS client and TLS server have all the required certificates.
To set up a secure TCP connection to a TLS client, follow these steps:
1. Create a global data block in the project tree.
2. Define a tag of the data type TCON_QDN_SEC in the global data block.
The example below shows the global data block "Data_block_1" in which the tag
"DNS ConnectionSEC" of the data type TCON_FDL_SEC is defined.
Figure 6-15 TCON_QDN_SEC_Server
3. Set the connection parameters of the TCP connection in the "Start value" column. Enter,
for example, the local ID of the TCP connection for "ID".
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