Siemens SIMATIC ET 200AL - Page 796

Open User Communication
6.11 Secure Open User Communication
Communication
110 Function Manual, 12/2017, A5E03735815-AF
3. Set the connection parameters of the TCP connection in the "Start value" column. Enter
the IPv4 address of the mail server, for example, for the "MailServerAddress".
Note
Connection parameters InterfaceId and ID
Note that you can enter the v
alue "
0
" for the interface ID and the ID with instruction
version V5.0 or higher of the instruction TMAIL_C in the data type TMAIL_V4_SEC. In
this case the CPU itself searches for a matching local CPU interface or a free connection
ID.
4. Set the parameters for secure communication in the "Start value" column. Enter the
certificate ID of the CA certificate of the communication partner, for example, for
"TLSServerCertRef".
– "ActivateSecureConn": Activation of secure communication for this connection. If this
parameter has the value FALSE, the subsequent security parameters are irrelevant.
You can set up a non-secure TCP or UDP connection in this case.
– "TLSServerCertRef": Reference to the X.509 V3 (CA) certificate of the mail server,
which is used by the TLS client to validate the authentication of the mail server.
5. Create a TMAIL_C instruction in the program editor.
6. Interconnect the MAIL_ADDR_PARAM parameter of the TMAIL_C instruction with the tag
of the data type TMAIL_V4_SEC.
In the following example the MAIL_ADDR_PARAM parameter of the TMAIL_C instruction
is interconnected with the tag "MailConnectionSEC" (data type TMAIL_V4_SEC).
Figure 6-27 TMAIL_C instruction