Problem
With the current increase in the degree of networking within the automation business, there is an increasing demand to exchange messages across the borders of different local networks (LANs).

Solution
E-mails which are being sent by means of the SMTP protocol offer a quick, cheap and reliable method to transfer messages worldwide.Furthermore, e-mail can be sent employing existing infrastructute (Internet).

By means of the function block FB 490, all S7-300/400 CPUs, ET200S/IM151 distributed I/Os, ET200PRO/ IM 154-8 CPUs and WinAC computers like the SIMATIC Microbox PCs, can send e-mails to any SMTP server. The dispatch ofthe messages can be triggered depending on arbitrary system events (variable states, faults, expiration of timers). In mail attachments, up to 64kByte of binary data may be transmitted. For secure authentication, the well-established SMTP-AUTH protocol is employed.

Downloads

Content of Downloads	Download
Documentation "Function block FB 490 for the dispatch of e-mails via the SMTP protocol"
Code Function block FB 490 and STEP 7 sample configuration

Security Notice
The functions and solutions described in this article confine themselves to the realization of the automation task predominantly. Please take into account furthermore that corresponding protective measures have to be taken up in the context of Industrial Security when connecting your equipment to other parts of the plant, the enterprise network or the Internet. Further information can be found under the Content-ID 50203404.

Last Changes
Chapter 5.1 has been changed
Function block FB1 has been changed