Siemens S7-300 - DNS Configuration Parameter Group; FTP Parameter Group

Configuring the Ethernet CP with STEP 7
3.3 Setting further CP properties
Configuring and commissioning S7 CPs for Industrial Ethernet
58 Configuration Manual, 09/2013, C79000-G8976-C182-13
3.3.10
"DNS configuration" parameter group
Meaning
When configuring an e-mail connection, the address of the e-mail server via which the e-
mails are sent must be specified. This address can be specified in absolute or symbolic form.
If you use a symbolic address, the absolute address is obtained by querying the DNS server
you specify in the DNS configuration.
3.3.11
"FTP" parameter group
The FTP server mode of the CP requires settings in the configuration. This affects the
following modes:
● Advanced CP as FTP server for the file system on the CP (Page 147)
● Advanced CP as FTP server for the S7 CPU data (Page 150)
Project engineering
● "Enable FTP server" option
Select this option if you want to allow FTP access to the S7 station via Port 20/21 of the
CP.
This must also be enabled if you want to use FTP access to file DBs on the CPU.
FTP server access via Port 20/21 is enabled by default.
● "Use FTP server for S7 CPU data" option
If you select this option, the file allocation table configured here is created on the CP
when you download the project engineering data and store it in the /config folder of the
file system of the CP.
An existing file_db.txt file is overwritten.
● "Allow access only via FTPS" option:
The option can be set when security is enabled and has the following effects: The files
are transferred encrypted.
Requirements:
– For the user, the rights "FTP: Read files (DBs) from the S7 CPU" or "FTP: Write files
(DBs) from the S7 CPU" must be activated.
– If the firewall is activated, the FTP/FTPS protocols must be allowed.
Ethernet CP as FTP server for the S7 CPU data
To transfer data with FTP, create data blocks on the CPU of your S7 station. Due to their
special structure, these are known as file DBs.
In the S7 station, the data blocks used for file transfer are mapped to files. As an FTP server,
the Ethernet CP uses the file assignment table (file_db.txt) to map an FTP command.