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139
FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.10 Extension Register [R] and Extension File Register [ER]
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
4.10
Extension Register [R] and Extension File Register [ER]
Extension registers (R) are the extended form of data registers (D).
The contents of extension registers (R) can be stored in extension file registers (ER). In FX
3U
/FX
3UC
PLCs,
extension file registers (ER) are available only while the memory cassette is attached.
4.10.1 Numbers of extension registers and extension file registers
The table below shows numbers of extension registers (R) and extension file registers (ER).
(Numbers are assigned in decimal.)
1. FX
3U
/FX
3UC
PLC
2. FX
3G
PLCs
*1.
Available only while a memory cassette is mounted (because they are stored in the flash memory
inside a memory cassette.)
*2.
These registers can be changed to the latched (battery backed) type by the parameter setting when
the optional battery is used. However, the latched range cannot be set.
*3.
These registers are stored in the EEPROM built in the PLC, or in the EEPROM in the memory
cassette when the memory cassette is attached.
4.10.2 Data storage destination and access method
Because the memory for storing data is different between extension registers and extension file registers, the
access method is different as shown in the table below:
Data storage destination
Difference in the access method
Extension register (R)
(latched [battery backed] type)
Extension file register (ER)
(file type)
R0 to R32767
32768 points
ER0 to ER32767
32768 points
*1
Extension register (R)
(General type)
Extension file register (ER)
(file type)
R0 to R23999
24000 points
*2
ER0 to ER23999
24000 points
*3
Device
PLC
Data storage destination
Extension register
FX
3U
/FX
3UC
Built-in RAM (latched [battery backed] area)
FX
3G
Built-in RAM
Extension file register
FX
3U
/FX
3UC
Memory cassette (flash memory)
FX
3G
Built-in EEPROM or EEPROM in memory cassette
Access method
Extension
register
Extension file register
Reading in program
3
U
Only dedicated instructions
are enabled
Writing in program
3
U
Only dedicated instructions
are enabled
Display module
3
3
Data change
method
Test operation in online mode of GX Developer
3
×
Batch writing by GX Developer
3
3
Computer link function
3
×