Technical data

Fieldbus Communication • 189
ETHERNET
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
4.1.3.3.6 FTP-Server (File Transfer Protocol)
The file transfer protocol (FTP) enables files to be exchanged between differ-
ent network stations regardless of operating system.
In the case of the ETHERNET coupler/controller, FTP is used to store and
read the HTML pages created by the user, the IEC61131 program and the
IEC61131 source code in the (programmable) fieldbus coupler or controller.
A total memory of 1.5 MB is available for the file system. The file system is
mapped to RAM disk. To permanently store the data of the RAM disk, the in-
formation is additionally copied into the flash memory. The data is stored in
the flash after the file has been closed. Due to the storage process, access
times during write cycles are long.
Attention
Up to 1 million write cycles are possible for writing to the flash memory for
the file system.
The following table shows the supported FTP commands for accesses to the
file system:
Command Function
USER Identification of the user
PASS User password
ACCT Account for access to certain files
REIN Server reset
QUIT Terminates the connection
PORT Addressing of the data link
PASV Changes server in the listen mode
TYPE Determines the kind of the representation for the transferred file
STRU Determines the structure for the transferred file
MODE Determines the kind of file transmission
RETR Reads file from server
STOR Saves file on server
APPE Saves file on server (Append mode)
ALLO Reservation of the necessary storage location for the file
RNFR Renames file from (with RNTO)
RNTO Renames file in (with RNFR)
ABOR Stops current function
DELE Deletes file
CWD Changes directory
LIST Gives the directory list