46817803_Archiv_en.zip - In the archive, you will find the documentation and sample projects for sending unsecure emails with the FB "PN_Mail".

46817803_Email_with_SimaticS7.zip - Sample project for TIA Portal V17 (835,8 KB)

46817803_EMail_with_SimaticS7_V3_2_en.pdf - APPLICATION EXAMPLE Sending of emails over secure connections with S7-1500 and S7-1200 PLCs / Entry-ID: 46817803 V3.2 04/2026  

Sending Emails to SMTP Servers with an S7 CPU

IMATIC S7 stations also allow the use of email as the default mechanism for transmitting error conditions or warnings from industrial plants to a control center or operating staff.

Nowadays, for security reasons, most email service providers only support an encrypted connection to their SMTP servers.

The following Ethernet ports can be used to set up a secure connection (SMTP over TLS) to an email server and send an email from the user program using the "TMAIL_C" instruction.

• Ethernet port of S7-1500 CPU (V2.5 and higher version) or S7-1200 CPU (V4.4 or higher version)
• Ethernet port of the CP of S7-1500 or S7-1200

Setting up a secure email connection requires the following steps that are described in the application example:

• Determine and download the provider certificates
• Allow the email account access by the CPU or CP
• Activate the security features in the CPU or CP
• Import the provider certificates into STEP 7 (TIA Portal)
• Add the provider certificates to the CPU or CP
• Connect the Ethernet port to the Internet
• Configure the DNS server
• Parameterize the TMail system data types in STEP 7 (TIA Portal)
• Parameterize the "TMAIL_C" instruction
• Set the S7 CPU's and CP's time

Download
Documentation (1,5 MB)  - original SIEMENS Link
Sample project for TIA Portal V17 (835,8 KB) -  original SIEMENS Link

Note
The sample project is protected. Log on with following credentials:

• User name: admin
• Password: Siemens.1

Archive
The FB "PN_Mail" function block (FB490) allows you to establish a non-secure connection from the following modules to an email server:

• S7-300/400 CPUs

• ET200S/IM151 distributed I/O systems

• ET200PRO/IM154-8 CPUs

• WinAC computers such as SIMATIC Microbox PCs

In the archive, you will find the documentation and sample projects for sending unsecure emails with the FB "PN_Mail".
Archive (798,7 KB) - original SIEMENS Link
Last Changes
04/2026: Update procedure for Gmail/Google Mail