Siemens CP 243-1 IT, Техническое руководство

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03/03 Programming
CP 243-1 IT
J31069-D0429-U001-A0-7618
103
Caution
E-mail communication is subordinate to S7 communication.
Since reaction times vary depending on the particular configuration, no general
predictions can be made. The greater the number of simultaneous S7 connections
and the larger the amount of data transferred per job, the longer the reaction times
will be for an e-mail job.
5.5 ETHx_FTPC
Calling the subprogram ETHx_FTPC causes the CP 243-1 IT to transfer data to an
FTP server or request data from such a server. In addition, this subprogram can be
used to delete files from the file system of an FTP server.
The type of data access which your CP 243-1 IT uses is specified by you during
configuration.
A total of up to 32 FTP jobs can be configured.
The following is already specified by you during configuration.
•
Whether you want data to be read from your S7-200 CPU and transferred to an
FTP server
•
Whether you want to request a file from an FTP server and copy it to your S7-
200 CPU
•
Whether you want to delete a file from the file system of an FTP server
•
Which data lengths, start addresses, file names, FTP server addresses, user
names and passwords you want to use for the action
When the subprogram ETHx_FTPC is called, you specify which of the configured
FTP client jobs you want the subprogram to execute.
The subprogram ETHx_FTPC is created by the Internet wizard in STEP 7 Mi-
cro/WIN 32 if you activated the FTP client service in the configuration of the CP
243-1 IT. Only then can you sent FTP client jobs via a CP 243-1 IT from an S7-200
user program.
Only one ETHx_FTPC subprogram can be active at a time. Since several FTP cli-
ent jobs cannot be sent at the same time, we recommend linking the "START" in-
put with both the return value "Done" of the ETHx_FTPC subprogram and the ap-
plicable bit of the return value "CH_Read" from the ETHx_CTRL subprogram.