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03/03
Note
The maximum length of the e-mail text of 1024 characters refers to the actual mes-
sage text including all embedded placeholders and all format characters ("\n" and
"\t").
If the maximum permissible length of 1024 characters is exceeded by resolution of
the placeholders when an e-mail is sent, the e-mail text is truncated after 1024
characters and an appropriate error message is returned. The truncated e-mail is
then transferred, however.
Conversion procedures such as MIME or UUENCODE are not supported. In addi-
tion, files cannot be appended to e-mails.
The e-mail function of the CP 243-1 IT can always be activated or deactivated with
the configuration.
Communication partners
In addition to conventional PCs, all terminals with e-mail capability are in principle
possible e-mail recipients (e.g., cell phones or FAX machines).
Performance/general conditions
Sending of e-mails is subordinate to S7 communication.
Reaction times when sending an e-mail depend on the configuration and cannot be
specified in general. The greater the number of simultaneous S7 connections and
the larger the amount of data to be transmitted over these connections, the longer
it takes to process and send e-mails.
Caution
The placeholders embedded in the e-mail text are read out individually from the
S7-200 CPU. Only one such value can be transferred per S7 cycle from the S7-
200 CPU to the CP 243-1 IT. This means that the time needed to set up an e-mail
depends on the amount of data to be included, the cycle time of the S7-200 CPU
and the load of the backplane bus.
2.3.4
FTP Server
How it works
The FTP server of the CP 243-1 IT can be used, among others, to transfer Web
files and configuration files from a geographically remote FTP client via Ethernet to
the file system of the CP 243-1 IT and to read them there.
In this case, the FTP client always initiates the data transfer. The FTP server of the
CP 243-1 IT never initiates FTP transmissions itself.
CP 243-1 IT
J31069-D0429-U001-A0-7618
Features and Functions
27
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