Siemens SIMATIC S7-1200 System Manual page 1302

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TeleService communication (SMTP email)

14.1 TM_Mail (Send email) instruction

Interaction of the Done, Busy and Error parameters

If the CPU is changed to STOP mode while TM_MAIL is active, then the communication

connection to the email server is terminated. The communication connection to the email

server is also lost if problems occur in CPU communication on the Industrial Ethernet bus. In

these cases, the send process is suspended and the email does not reach the recipient.

Modifying user programs

Deletion and replacement of program blocks, the calls to TM_MAIL, or calls to the instance

DBs of TM_MAIL can break the linking of program blocks. If you fail to maintain linked

program blocks, then the TPC/IP communication functions can enter an undefined state,

possibly resulting in property damage. After transferring a modified program block, you

would have to perform a CPU restart (warm) or cold start.

To avoid breaking the linking of program blocks, only change the parts of your user

program that directly affect the TM_MAIL calls in the following cases:

• The CPU in the STOP mode

• No email is sent (REQ and BUSY = 0)

Data consistency

The input parameter ADDR_MAIL_SERVER is read when the operation is started. A new

value does not take effect until the current operation is complete and a new TM_MAIL

operation is initiated.

In contrast, the parameters WATCH_DOG_TIME, TO_S, CC, FROM, SUBJECT, TEXT,

ATTACHMENT, USERNAME and PASSWORD are read during the execution of TM_MAIL

and may be changed only when the job is finished (BUSY = 0)

Job is in progress.

The job was completed successfully.

The job was terminated with an error. For the cause of the error, refer to the

STATUS parameter.

No job in progress

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK