Siemens S7-300 - Authentication and Other Features of the Advanced CP

Sending process messages by email
8.1 Overview of the functions
Configuring and commissioning S7 CPs for Industrial Ethernet
136 Configuration Manual, 09/2013, C79000-G8976-C182-13
8.1.1
Authentication and other features of the Advanced CP
Features of the CP
● The Advanced CP operates as an email client. It supports the SMTP service (Simple Mail
Transfer Protocol).
● As of device type CP 343-1 Advanced (GX30/GX31) and CP 443-1 Advanced
(GX20/GX30), ESMTP with authentication is supported.
● E-mails can be sent from the automation system, but they cannot be received.
To send an e-mail in the user program of the S7-CPU, use the send call of the
SEND/RECEIVE interface (program blocks AG_SEND / AG_LSEND).
● Mechanisms are available for sending test mails; refer to section Testing the email
function (Page 143)
Authentication
Advanced CPs that use ESMTP with authentication support the following authentication
methods:
● PLAIN
● LOGIN
● CRAM−MD5
● DIGEST−MD5
In terms of authentication for communication between the CP and mail server, the following
situations are possible:
●
CP and mail server use authentication - with the same method
Once the CP has established a connection to the mail server, the mail server sends a list
of the authentication methods it supports. The CP searches through the received list for
the supported authentication method. The authentication methods are searched for in the
order shown above. The first method found in the list is then used. The CP informs the
mail server of this.
You enter the data required for authentication (user name and password) in the e-mail
data block (see section Sending an e-mail (Page 141)). The user name and password
correspond to the login data at the mail service provider.
If you do not specify a user name and password in the DB, there will be no
authentication.
●
CP and mail server use authentication - with different methods
If the CP does not find a suitable authentication method, it aborts the transmission and
generates a diagnostics message (see section Diagnostics messages from e-mail
connections with authentication (Page 215)).