CJ2 CPU Unit Software User's Manual - CIP ETI

7 File OperationsBackup FilesThese files are saved in the Memory Card and back up all PLC data by using the DIP switch on the frontof the CPU Unit or the Memory Card's power supply switch. The file name is fixed as BACKUP@@. Fordetails, refer to information on the 8-3 Simple Backup in the CJ2 CPU Unit Hardware User’s Manual(Cat. No. W472).PLC Backup Tool FilesThese files back up all PLC data and are created using backup and restore operations with the PLCBackup Tool. For details, refer to 8-2 Using a Computer to Back Up Data in the CJ2 CPU Unit HardwareUser’s Manual (Cat. No. W472).CX-Programmer FilesThese files are created by the CX-Programmer. The file names created in file memory are fixed. Whena project is transferred, any one of the following memory options can be selected as the transfer destinationfor these CX-Programmer files.• Comment memory (in the CPU Unit's flash memory)• Memory Card• EM file memoryType Name Description ExplanationSymbol table files(except networksymbols)SYMBOLS.SYMGlobal symboltables (except networksymbols) andlocal symbol tablesComment files COMMENTS.CMT Rung commentsand comments(annotations)Program index files PROGRAM.IDX Section names,section comments• Includes the variables in the CX-Programmer'sglobal/local symbol tables, addresses,data types, and I/O comment information.Network symbols are not included.• Also includes the data set in the CX-Programmer'sautomatic PLC address allocation.Contains the CX-Programmer's rung commentand comment information.Contains the CX-Programmer's section delimiterinformation, although the delimiter locationsdepend on the section delimiter instructions inthe program.Note With the CX-Programmer, the symbol table files and comment files in the above table (except network symbols)can be transferred online between the CX-Programmer and personal computer RAM and between thepersonal 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 simplebackup operation is performed, symbol tables, comment files, and program index files stored in thecomment memory will be automatically created as backup files and stored in the Memory Card.7-14 CJ2 CPU Unit Software User’s Manual