Communication
11.2 PROFINET
S7-1200 Programmable controller
886 System Manual, V4.2, 09/2016, A5E02486680-AK
You define the content of the e-mail, and the connection data, using the following
parameters:
● You define the recipient addresses with the parameters TO_S and CC.
● You define the content of the e-mail with the parameters SUBJECT and TEXT.
● You can define an attachment using VARIANT pointers at the ATTACHMENT and
ATTACHMENT_NAME parameters.
● The connection data are defined, and addressing and authentication for the mail server
executed, using the system data type Tmail_v4 or Tmail_FQDN at the
MAIL_ADDR_PARAM parameter. If you are using the interface of the S7-1200 CPU, the
system data type Tmail_v4 must be used. In this case, the e-mail can only be sent using
SMTP.
● You start the sending of an e-mail with an edge change from "0" to "1" for the REQ
parameter.
● The job status is indicated by the output parameters "BUSY", "DONE", "ERROR" and
"STATUS".
You cannot send an SMS directly with the "TMAIL_C" instruction. Whether or not the e-mail
can be forwarded by the mail server as an SMS depends on your telecommunications
provider.
Operation of the instruction
The "TMAIL_C" instruction works asynchronously, which means its execution extends over
multiple calls. You must specify an instance when you call the instruction "TMAIL_C".
In the following cases, the connection to the mail server will be lost:
● If the CPU switches to STOP while "TMAIL_C" is active.
● If communication problems occur at the Industrial Ethernet bus. In this case, the transfer
of the e-mail will be interrupted and it will not reach its recipient.
The connection is also canceled once the instruction has been successfully executed and
the e-mail sent.
You can change the parts of your user program that directly affect calls of "TMAIL_C" only
when:
• The CPU is in "STOP" mode.
• No e-mail is being sent (REQ = 0 and BUSY = 0).
This relates, in particular, to deleting and replacing program blocks that contain "TMAIL_C"
calls or calls for the instance of "TMAIL_C".
Ignoring this restriction can tie up connection resources. The automation system can
change to an undefined status with the TCP/IP communication functions via Industrial
Ethernet.
A warm or cold restart of the CPU is required after the changes are transferred.
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