Siemens SIMATIC ET 200AL System Manual page 1211

Communications services
3.6 Secure Communication
To set up a secure connection via the IP4 address of the mail server, follow these steps:
1. Create a global data block in the project tree.
2. Define a tag of the data type TMAIL_V4_SEC in the global data block.
The example below shows the global data block "MailConnDB" in which the tag
"MailConnectionSEC" of the data type TMAIL_V4_SEC is defined.
Figure 3-32 Data type TMAIL_V4_SEC
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 parameter Interface ID
Note that as of instruction version V5.0 of TMAIL_C instruction in the TMAIL_V4_SEC data
type, you need to enter the value "0" for the Interface ID. In this case, the CPU itself
searches for a suitable local CPU interface.
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
– "TLSServerCertRef": Reference to the X.509 V3 (CA) certificate of the mail server, which
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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.
is used by the TLS client to validate the authentication of the mail server.
Function Manual, 05/2021, A5E03735815-AJ
Communication