Omron CJ - PROGRAMMING MANUAL 12-2009 Programming Manual page 245

File Memory
Restrictions on File Use
Files
Directories
File Categories
Files That Can Be Written
from the CPU Unit
CPU Unit
Program files
User program
Data files
I/O memory
Etc.
Programming
Device, FINS
commands, ladder
instructions, or
control bits
Programming Device, FINS
commands, ladder instructions,
or control bits
EM file
memory
Program files
Data files
Internal
Comment
flash
memory
memory
Files are formatted in DOS, and therefore can be used as regular files on a
Windows computer.
Files are identified by file names and extensions, as shown in the following
table. A file name is written using the following characters: Letters A to Z,
numbers 0 to 9, !, &, $, #, `, {, }, –, ^, (, ), and _
The following characters cannot be used in file names: ,, ., /, ¥, ?, *, ", :, :, <, >,
=, +, space, and 2-byte characters.
The filename extensions depend upon the type of file being stored.
The CS/CJ-series CPU Units can access files located in subdirectories. Spec-
ify the directory location in file memory where the file is stored. Directories
can be specified up to 5 subdirectories deep (counting the root directory),
unless a Programming Console is being used. Only the root directory can be
accessed from a Programming Console. The maximum length of a directory
path is 65 characters. When creating a Memory Card subdirectory with an
operating system such as Windows, do not exceed the maximum subdirectory
depth (5 subdirectories).
The following 4 categories of files are managed (read and written) by the CPU
Unit with file memory operations.
File type
Program Data
file
General Yes
files
Automatic Yes
Transfer at
Startup
Files
Files That Can Be Written
from the CX-Programmer
CX-Programmer
Data transfer
operations from the
CX-Programmer
Symbol files
Comment files
Memory
Program index files
Card
When a
Memory Card is
not inserted
Corresponding file type
Parame- Symbol
file ter file table file
Yes Yes No
Yes Yes No
Section 5-1
Comment Program Unit/
file index file Board
backup
file
No No No
No No No
205