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03/03
2.4
File System
How it works
A file system is available on the CP 243-1 IT to permanently store Web and con-
figuration files. This file system uses flash memory technology and offers a storage
capacity of 8 Mbytes minus the memory needed for administration of the flash file
system.
Note
The amount of memory which is actually available in the file system can be called
with HTML page "CP 143-1 IT Information" (included with the CP 243-1 IT) via a
Web browser under the address:
http://<destination IP address>/__S7Sys/it_info.htm
Due to the formatting of the file system, the amount of memory specified on this
page cannot always be fully utilized.
The file system supports path and file names up to a total length of 254 characters.
The drive name of the flash file system (/flash:) is also added to the 254 charac-
ters. This means that, after the drive name is deducted, 247 characters remain for
a maximum path including the file name. The actual file name and every name of a
directory can have a maximum length of 99 characters. The maximum nesting
depth of the directories is 49.
The following characters may not be used in either file or directory names:
\ ; / ; < ; > ; " ; : ; * ; ?
Note
We recommend always storing files in suitable subdirectories and not in the root di-
rectory.
Since the CP 243-1 IT has neither date nor time, all files stored in the file system of
the CP 243-1 IT have the date 01.01.1980 and the time 00:00.
Access
The file system can only be accessed with the FTP server of the CP 243-1 IT. The
file system does not distinguish between upper case and lower case letters.
CP 243-1 IT
J31069-D0429-U001-A0-7618
Features and Functions
37
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