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FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
2 Overview (Sequence Program)
2.6 Program Memory and Devices
1
Int
roduct
ion
2
O
ver
view
3
In
str
uc
tion
Li
st
4
D
evices
in D
etail
5
Spec
ified t
he
D
evice &
C
onst
ant
6
Bef
ore
Pr
ogr
am
m
ing
7
B
asic
In
st
ru
ct
io
n
8
FN
C
00-FN
C
09
P
rogr
am
F
low
9
FN
C
10
-FN
C
19
Mo
ve
&
Co
mp
are
10
FNC2
0-F
NC2
9
Ar
ith.
&
Logic
O
per
ation
2.6.3
Types of backup methods against power failure
There are following types of latch (battery backup) for the program memory and built-in devices in the PLC.
1. Battery backup method
a) FX
3U
/FX
3UC
PLC
b) FX
3G
PLCs
2. Memory cassette backup method
a) FX
3U
/FX
3UC
PLC
b) FX
3G
PLCs
3. EEPROM memory (built in PLC) backup method
a) FX
3G
PLCs
Item
Description
Latched (battery
backed) contents
The battery backs up the RAM memory built in the PLC, latched (battery backed) type devices and
clock data.
Maintenance
The battery life is around 5 years, (when the ambient temperature is 25
°
C).
For replacement information, refer to the Users Manual [Hardware Edition] of each PLC.
Cautions
1) When the battery voltage becomes low, sequence programs and other latched (battery backed)
contents are lost.
2) When an optional memory cassette (flash memory) is mounted, it is not necessary to back up
sequence programs by the battery.
Item
Description
Latched (battery
backed) contents
The optional battery backs up the RAM memory built in the PLC and clock data.
Maintenance
The battery life is around 5 years, (when the ambient temperature is 25
°
C).
For replacement information, refer to the Users Manual [Hardware Edition] of each PLC.
Cautions
When the optional battery voltage becomes low, the RAM memory built in the PLC and clock data are
lost.
Item
Description
Latched (battery
backed) contents
1) The flash memory built into the memory cassette backs up sequence programs.
2) A battery is required to back up latched (battery backed) devices and clock data from failure.
Maintenance
Maintenance is not necessary.
Cautions
The upper limit is set to the number of times for overwriting.
(Refer to the Hardware Edition of the main unit.)
Item
Description
Latched (battery
backed) contents
The EEPROM memory built in the memory cassette backs up sequence programs.
Maintenance
Maintenance is not necessary.
Cautions
The upper limit is set to the number of times for overwriting.
(Refer to the Hardware Edition of the main unit.)
Item
Description
Latched (battery
backed) contents
The EEPROM memory built in the PLC backs up latched (battery backed) type devices and sequence
programs.
Maintenance
Maintenance is not necessary.
Cautions
The upper limit is set to the number of times for overwriting.
(Refer to the Hardware Edition of the main unit.)