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File and folder configuration
The following shows the configurations of files and folders.
: Access allowed/Valid, : Access not allowed/Invalid, : No folder
Drive
Folder
/0
/4
MELPRJ
/SYSTEMROM
OS_IMAGEFILE
INCLUDE
*3
/2
MELPRJ
*4
/USB0
*1 The folder is created after initialization or writing parameters.
*2 The suffixed 'XX' indicates the upper two digits of the serial number.
*3 The drive is created when an SD memory card is inserted.
*4 The drive is created when a USB Mass Storage Class-compliant device is connected.
Considerations on file operation
The following explains the restriction on memory and drive operations of a C Controller module.
■Writing files
Before writing files with an FTP or a Telnet during user program operation, make sure that the files to be written will not affect
the running user program.
■Access to the "MELPRJ" folder
The "MELPRJ" folder manages data written with CW Configurator. Do not access it for a purpose other than backup or
restoration.
If a portion of the files stored in the folder is changed, the C Controller module may not operate properly.
■Access to the same file
For C Controller modules, a file being written cannot be accessed and a file being accessed cannot be written.
■Number of files
Up to 512 files can be stored in the program memory and data memory of a C Controller module.
number of files.) However, the maximum number may be reduced depending on a file name length and character types.
When using an SD memory card and a USB Mass Storage Class-compliant device, note that the number of files which can be
stored differs depending on the memory capacity and a file system format.
The number of files in a folder must be 500 or less. Storing more than 500 files may significantly increase the file access time.
*1 This number applies when storing a file which is composed of a file name within 8 characters and an extension within 3 characters, and
which includes alphanumeric characters (not including lower-case characters) only.
■Creating folders
Do not create a folder in the root ("/") of a C Controller module. If a folder is created, an error may occur or an unintended
folder may be created. (These errors also occur when transferring a folder to the root ("/") from FTP.)
3 MEMORY CONFIGURATION OF C Controller Module
28
3.4 Files
File
*1
*2
R12CCPU-V_XX
CCPUFunc.h
MDFunc.h
DANLFunc.h
prjParams.h
DriveNameInfo.txt
*1
FTP access
VxWorks image file
C Controller module dedicated
function header file
MELSEC data link function
header file
Data analysis function/
statistical analysis function
header file
VxWorks component list file
Drive name list file
Factory setting After
initialization
*1
(A folder is included in the
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