User manual

74
EEPROM Backup
What's EEPROM backup?
EEPROM (Electric Erase Programmable Read Only Memory) can retain
the data when the power is turned off, and erase or record data when
the power is turned on. This function allows you to retain the PLC
program when the power is turned off. And it also erases an existing
program and records a new one when correcting or storing a program
after turning on the power.
Applicable models
The types of EEPROM can be defined by its characteristics.
The CPUs for OE M
AX NX70 (NX70-CPU70p1 and NX70-CPU70p2) PLC
use the flash memory.
This function is widely used since it is easy to use, store, and transfer
data, and is built in the NX70 PLC (NX70-CPU70p2).
EEPROM uses 29EE512 and has a minimum of 3000 times to write to
flash memory. It should be noted that the memory is to be changed
when exceeding the use of over 3,000 times.
Procedure
Backup using WinGPC
How to backup using WinGPC
Connect Online.
Save the completed program onto the PLC (Download: WinGPC =>
PLC).
Select the ‘EEPROM Backup (E)’ in the ‘Online’ menu.
DIP switch OFF
Operates with the program stored
in RAM using battery power.
DIP switch ON
Erases the contents of RAM and
copy the programs stored in
EEPROM onto RAM to operate.
Starts ‘EEPROM backup’ or
operates ‘EEPROM backup’ at
WinGPC
RAM
Operation
Battery
PLC Power ON
Program
stored in EEPROM