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File Memory Section 5-1
• Comment memory (in the CPU Unit’s flash memory)
Note 1. Data can be transferred to comment memory only when the CX-Program-
mer version is version 5.0 or higher and the CPU Unit has a unit version or
3.0 or later.
2. With CX-Programmer version 4.0 or lower, these files cannot be stored in
comment memory, even if a CPU Unit with unit version 3.0 or later is being
used.
Note With CX-Programmer version 1.2 or higher, the symbol table files and com-
ment files in the above table can be transferred online between the CX-Pro-
grammer and personal computer RAM and between the personal computer
RAM and the memory storage device.
Directories
It is possible to access files in subdirectories with CS/CJ-series PLCs, but
Programming Consoles can access files only when they are in the root direc-
tory. The maximum length of a directory path is 65 characters. Be sure not to
exceed the maximum number of characters when creating subdirectories in
the Memory Card with a program such as Windows.
File Sizes
The size of files in bytes can be calculated with the equations in the following
table.
Type Name Description Explanation
Symbol table files SYMBOLS
.SYM
Global symbol tables and local
symbol tables
• Includes the variables in the CX-Programmer's
global/local symbol tables, addresses, data types,
and I/O comment information.
• Also includes the data set in the CX-Program-
mer's automatic PLC address allocation.
Comment files COMMENTS
.CMT
Rung comments and comments
(annotations)
Contains the CX-Programmer's rung comment and
comment information.
Program index
files
PROGRAM
.IDX
Section names, section com-
ments
Contains the CX-Programmer's section delimiter
information, although the delimiter locations depend
on the section delimiter instructions in the program.
Note Supported by CX-Programmer version 2.0 or
higher only.
File type File size
Data files (.IOM) (Number of words × 2) + 48 bytes
Example: Entire DM Area (D00000 to D32767)
(32,768 words × 2) + 48 = 65,584 bytes
Data files (.TXT or .CSV) The file size depends upon the number of delimiters and
carriage returns being used. The delimiter code is one
byte and the carriage return code is two bytes.
Example 1: Non-delimited words, no carriage return
123456789ABCDEF012345678 occupies 24 bytes.
Example 2: Delimited words, carriage return every 2 fields
1234,5678↵
9ABC,DEF0↵
1234,5678↵
occupies 33 bytes.
Example 3: Delimited double words, carriage return every
2 fields
56781234,DEF01234↵
56781234↵
occupies 29 bytes.
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