Application and properties
1.6 IT communication
CP 243-1
Operating Instructions, 03/2012, C79000-G8976-C244-02
21
The text message is made up of ASCII characters. The text may contain placeholders for
variables that reference a data value within the local S7-200 system. When the e-mail is
sent, the CP 243-1 reads each specified value from the local S7-200 CPU and inserts it in
the desired format at the specified location in the message. With the CP 243-1, it is possible
to send e-mails preconfigured by an S7-200 user program to an e-mail server specified
during the configuration phase. The e-mail server then forwards the e-mail to the recipient
specified in the address field of the e-mail.
The FTP server specified in the configuration must be located in the subnet of the CP 243-1
or must be accessible via a gateway. If this e-mail server cannot be accessed, the e-mail is
sent to a substitute e-mail server that is also specified when the CP 243-1 is configured. If
this substitute e-mail server is also not accessible, an error message is generated to this
effect.
NOTICE
The CP 243-1 only monitors whether or not an e-mail could be delivered to the configured
e-mail server. It cannot detect whether this e-mail was forwarded to or read by the specified
recipient.
Note
Depending on the configuration, memory areas of the S7-200 CPU need to be read before
an e-mail is sent. This means that resetting the S7-200 CPU or a power down may cause the
e-mail transfer to be aborted.
This, in turn, means that no e-mail can be sent to indicate that the S7-200 CPU has been
reset.
The CP 243-1 does not support the receipt of e-mails. The e-mails and the address
parameters of the e-mail server are configured in STEP 7 Micro/WIN 32.
Note
To allow e-mails to be sent by the CP 243-1, make sure that it can access a functioning e-
mail server.
One of the ways in which you can test whether or not a e-mail server is accessible is to use
HTML page sendmail.htm, which ships with the CP 243-1 (see chapter HTTP server
(Page 28)).
Configuration
The e-mails and the address parameters of the e-mail server are configured with the Internet
wizard of STEP 7 Micro/WIN 32. The configuration data entered here is stored permanently
in a file with the extension .edb in the file system of the CP 243-1. The data is transferred
from the system on which the configuration was created with STEP 7 Micro/WIN 32 to the
CP 243-1 via FTP.
Up to 32 e-mails can be configured. Each e-mail text can consist of up to 1024 characters.
These e-mails have the following structure:
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