Siemens SIMATIC S7-1500 Function Manual page 111

Open User Communication
6.11 Secure Open User Communication
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,
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
Setting up a secure connection to a mail server over the interface of a communication module
For secure communication to a mail server over a communication module, you need to
create a data block with one of the system data types TMAIL_V4_SEC, TMAIL_QDN_SEC or
TMAIL_V6_SEC yourself, assign parameters and call it directly at the TMAIL_C instruction.
Requirements:
● TMAIL_C instruction with version V4.0
● S7-1500 CPU as of firmware version V2.0 with communication module CP 1543-1 as of
firmware version V2.0
● ET 200SP CPU as of firmware version V2.0 with communication module CP 1542SP-1
(IRC) as of firmware version V1.0
● You have assigned all the CA certificates of the mail server (TLS server) to the CP
(TLS client) and have downloaded the configuration to the CPU.
● Current date and time are set in the CPU.
The STEP 7 online help describes how to set up a secure connection to a mail server over
the interface of a communication module.
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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.
which is used by the TLS client to validate the authentication of the mail server.
TMAIL_C instruction
Function Manual, 11/2019, A5E03735815-AH
Communication