Siemens S7-400 - Installing the S7-400

Performance data
2.7 Characteristic data for FTP / FTPS mode
CP 443-1 Advanced
Equipment Manual, 03/2023, C79000-G8976-C256-07
27
Authentication
The CP supports the following authentication methods:
• PLAIN
• LOGIN
• CRAM-MD5
• DIGEST-MD5
For more detailed information, refer to the manual /2/ (Page 103).
If your service provider requires authentication, you need to import the certificate you
received from your service provider into the CP to authenticate the CP with the server. For the
procedure, refer to the section Importing certificates for SMTP with STARTTLS or FTPS
(Page 72)
2.7 Characteristic data for FTP / FTPS mode
TCP connections for FTP/FTPS
FTP actions are transferred from the CP over TCP connections. Depending on the mode, the
following characteristic data applies:
• FTP in client mode:
You can configure a maximum of 20 FTP connections. Up to 2 TCP connections are
occupied per configured FTP connection.
• FTP in server mode:
You can operate a maximum of 10 FTP sessions at the same time. Up to 2 TCP connections
are occupied per FTP session (1 control connection and 1 data connection).
If you use FTPS with authentication, you need to import the certificate you received from
your service provider into the CP to authenticate the CP with the server. For the procedure,
refer to the section Importing certificates for SMTP with STARTTLS or FTPS (Page 72)
Program block FTP_CMD (FB40) for FTP client mode
For communication via a TCP connection configured with the "Use FTP protocol" option, use
the FTP program block FTP_CMD (FB40).
The block execution time in FTP depends on the reaction times of the partner and the length
of the user data. A generally valid statement is therefore not possible.