Omron CJ - PROGRAMMING MANUAL 08-2008 Programming Manual page 278

Manipulating Files
Note
Comparing Data in the Memory Card and CPU Unit
240
1. The backup function will override the automatic transfer at startup function,
so the backup files will be read to the CPU Unit when the PLC is turned ON
even if pin 2 of the DIP switch is ON.
2. Data will not be read from the Memory Card to the CPU Unit if pin 1 of the
DIP switch is ON (write-protecting program memory).
3. When the backup files are read from the Memory Card by the backup func-
tion, the status of I/O memory and force-set/force-reset bits will be cleared
unless the necessary settings are made in the Auxiliary Area and PLC Set-
up.
If the IOM Hold Bit (A50012) is ON and the PLC Setup is set to maintain
the IOM Hold Bit Status at Startup when the backup files are written, the
status of I/O memory data will be maintained when data is read from the
Memory Card.
If the Forced Status Hold Bit (A50013) is ON and the PLC Setup is set to
maintain the Forced Status Hold Bit Status at Startup when the backup
files are written, the status of force-set and force-reset bits will be main-
tained when data is read from the Memory Card.
4. A CS1-H, CJ1-H, CJ1M, or CS1D CPU Unit will remain in PROGRAM
mode after the simple backup operation has been performed and cannot
be changed to MONITOR or RUN mode until the power supply has been
cycled. After completing the backup operation, turn OFF the power supply
to the CPU Unit, changes the settings of pin 7, and then turn the power
supply back ON.
5. File backups may take from several seconds to several minutes. Refer to
page 256 for information on execution times.
To compare the backup files in the Memory Card with the data in the CPU
Unit, turn OFF pin 7 on the CPU Unit's DIP switch, and press and hold the
Memory Card Power Supply Switch for three seconds. The backup function
will compare the program, parameter area data, I/O memory data, symbol
tables (see note), comment files (see note), and program index files (see
note) in the Memory Card with the corresponding data in the CPU Unit. This
function can be executed in any operating mode.
Note This data is supported by CS/CJ-series CPU Units with unit version 3.0 or
later only.
Section 5-2