Application and properties
1.6 IT communication
CP 243-1
Operating Instructions, 03/2012, C79000-G8976-C244-02
23
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 more data that
is transmitted over these connections, the longer it takes to process and send e-mails.
NOTICE
The variables for 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. This means that the time needed to set up an e-mail depends on
the amount of data to be inserted, the cycle time of the S7-200 CPU and the load on the S7
bus.
1.6.4 FTP server
How it works
The FTP server of the CP 243-1 can be used to read and write Web files and configuration
files from a remote FTP client via Ethernet to the file system of the CP 243-1.
The FTP client always initiates the file transfer. The FTP server of the CP 243-1 never
initiates FTP transfers itself.
All types of files can be transferred to the file system of the CP 243-1. The relevance of
these files to operation of the CP 243-1 is not checked.
NOTICE
The BINARY transmission mode should be used to transfer files between the FTP server of
the CP 243-1 and a remote FTP client. The transmission mode must be set at the FTP
client end.
Note
The CP 243-1 does not have a real-time clock. The files stored on or read from the CP 243-1
using FTP therefore all have the date 01.01.1980 and the time 00:00.
Access protection
FTP is a protocol in which users must authenticate themselves before they can access the
FTP server. This requires a valid user name and a password on the server. After a
connection has been established between the FTP client and the FTP server of the CP 243-
1, the user name and password must be entered. After successful authentication, the user
can then access the file system of the CP 243-1. Users can navigate through the directory
tree, transmit files and manage directories.
Up to 8 users and an administrator can be configured for the CP 243-1. Compared with the 8
users, the administrator has special rights and the administrator's fixed user name and
corresponding password are stored at a different location.
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