Sending Emails to SMTP Servers with an S7 CPU
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
The sample project is protected. Log on with following credentials:
- User name: admin
- Password: Siemens.1
The FB "PN_Mail" function block (FB490) allows you to establish a non-secure connection from the following modules to an email server:
ET200S/IM151 distributed I/O systems
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)
Documentation for STEP 7 V16 to establish a secure connection (SMTP over TSL) to an SMTP server with an S7-1500 / S7-1200.
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