7 File Operations
7-14
CJ2 CPU Unit Software User’s Manual
These files are saved in the Memory Card and back up all PLC data by using the DIP switch on the front
of the CPU Unit or the Memory Card's power supply switch. The file name is fixed as BACKUP@@. For
details, refer to information on the 8-3 Simple Backup in the CJ2 CPU Unit Hardware User’s Manual
(Cat. No. W472).
These files back up all PLC data and are created using backup and restore operations with the PLC
Backup Tool. For details, refer to 8-2 Using a Computer to Back Up Data in the CJ2 CPU Unit Hardware
User’s Manual (Cat. No. W472).
These files are created by the CX-Programmer. The file names created in file memory are fixed. When
a project is transferred, any one of the following memory options can be selected as the transfer desti-
nation for these CX-Programmer files.
• Comment memory (in the CPU Unit's flash memory)
•Memory Card
• EM file memory
Note With the CX-Programmer, the symbol table files and comment files in the above table (except network sym-
bols) can be transferred online between the CX-Programmer and personal computer RAM and between the
personal computer RAM and the memory storage device.
When a project is transferred from the CX-Programmer to the CPU Unit, symbol tables, comment files,
and program index files can be stored in the flash memory built into the CPU Unit. When the simple
backup operation is performed, symbol tables, comment files, and program index files stored in the
comment memory will be automatically created as backup files and stored in the Memory Card.
Backup Files
PLC Backup Tool Files
CX-Programmer Files
Type Name Description Explanation
Symbol table files
(except network
symbols)
SYMBOLS.SYM Global symbol
tables (except net-
work symbols) and
local symbol tables
• Includes the variables in the CX-Program-
mer's global/local symbol tables, addresses,
data types, and I/O comment information.
Network symbols are not included.
• 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 comments
Contains the CX-Programmer's section delim-
iter information, although the delimiter locations
depend on the section delimiter instructions in
the program.
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