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03/03
− Start address and length of the data in the data block
Specify here the address starting at which the data to be read are to be
stored in the memory of the S7-200 CPU or the address starting from which
the data to be written are to be sent to the FTP server, and how many bytes
are to be transmitted.
Note
The connection to an FTP server always uses port 20 for data communication and
port 21 for transmission of commands.
Note
The FTP client supports file names in upper case/lower case letters if the FTP
server with which the data are to be exchanged and the applicable file system
permit file names with upper case/lower case letters.
Caution
During configuration, the Internet wizard of STEP 7 Micro/WIN 32 only checks the
correctness of the FTP client configuration's syntax. Checks of this configuration's
semantics cannot be performed until the file transaction takes place.
The FTP client function of the CP 243-1 IT can always be activated/deactivated
with the configuration.
Communication partners
All FTP clients which communicate via Ethernet and which comply with RFC959
standards are always considered possible communication partners of the FTP cli-
ent. This means communication is not only possible with PC-based FTP servers
but also with FTP servers running on S7-200, S7-300 or S7-400 systems, for in-
stance.
Performance/general conditions
Note
If data from a remote FTP server is stored in the local S7-200 CPU, it is up to the
user to ensure that this data is not stored in memory areas which are already being
used. The CP 243-1 IT only performs rudimentary security checks for this.
The CP 243-1 IT does not ensure that all data to be transferred originate from one
cycle of the local S7-200 CPU or are all effective simultaneously in one cycle since
the transmission of these data to and from the local S7-200 CPU is asynchronous
in time to the cycle of the local S7-200 CPU and the duration cannot be predicted
in general terms.
With FTP write jobs, the CP 243-1 IT can read 246 bytes per cycle from the mem-
ory of the S7-200 CPU. With FTP read jobs, the CP 243-1 IT can even transfer up
to 254 bytes per cycle to the memory of the S7-200 CPU.
CP 243-1 IT
J31069-D0429-U001-A0-7618
Features and Functions
31
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