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Mitsubishi Electronics FX3G User Manual

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Page of 964
139
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
 Series
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.10 Extension Register [R] and Extension File Register [ER]
1
Introdu
ction
2
Ov
ervi
ew
3
Instruction 
Li
st
4
D
evices 
in Det
ai
l
5
Specifi
ed the
De
vice
 &
 
C
onst
ant
6
Bef
ore
 
Pr
og
ra
mmi
ng
7
Bas
ic 
Instruction
8
FN
C00-FN
C0
9
Program Fl
ow
9
FNC
10-FN
C19
Mov
e & Com
pare
10
FNC
20-FNC
29
Arith. & Lo
gi
c 
Operati
on
4.10.3 Structures of extension registers and extension file registers
One extension register consists of 16 bits. Extension registers can be used in 16-bit and 32-bit applied instructions in
the same way as data registers.
1) 16-bit type
One extension register (consisting of 16 bits) can handle a numeric ranging from 
−32768 to +32767.
A numeric value is usually read from and written to an extension register by applied instructions.
However, a numeric value can also be directly read from and written to an extension register from a display unit,
display module, or programming tool.
2) 32-bit type
Two serial extension registers (consisting of 32 bits) can express a 32-bit numeric value ranging from
 
−2,147,483,648 to +2,147,483,647. (A larger number register handles high-order 16 bits, and a smaller number
register handles low-order 16 bits.) 
• In the case of 32 bit type, when an extension register on the low-order side (example: R0) is specified, the 
subsequent serial number on the high-order side (example: R1) is automatically occupied.
Either an odd or even device number can be specified for the low-order side, but it is recommended to specify an 
even device number for the convenience of the monitoring function for display units, display modules, and 
programming tools.
4.10.4 Initialization of extension registers and extension file registers
The contents of extension registers are backed up by the battery even when the power is turned OFF or when the PLC
mode switches from STOP to RUN in FX
3U
/FX
3UC
 PLCs and in FX
3G
/FX
3GC
 PLCs if extension registers are changed
to the latched (battery backed) type and the optional battery is installed.
When initializing the contents of extension registers, clear them using a sequence program, GX Works2 or GX
Developer.
1. When clearing the data using a program
• When initializing some extension registers (R)
Example: When initializing (clearing) R0 to R199
• When initializing extension registers and extension file registers in sector units
Sectors are not provided for extension registers and extension file registers in FX
3G
/FX
3GC
 PLCs.
Example: When initializing R0 to R4095 and ER0 to ER4095 (initializing two sectors starting from R0 and ER0)
2. When clearing the data using GX Works2
Select [Online] 
→ [PLC Memory Operation] → [Clear PLC memory...] in GX Works2, and clear [Data device].
This operation initializes the contents of timers, counters, data registers, file registers and extension registers.
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2
4
8
16
32
64
128
256
512
1024
2048
4096
8192
16384
b15
Sign
0: Positive
    number
1: Negative
    number
b0
High
order
Low
order
R0, ER0 (16 bits)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
2
4
8
16
32
64
128
256
512
1024
2048
4096
8192
16384
b31
Sign
0: Positive
    number
1: Negative
    number
b0
High
order
Low
order
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
32768
65536
131,072
262,144
524,288
1,048,576
2,097,152
4,194,304
8,388,608
16,777,216
33,554,432
67,108,864
1
34,217,728
2
68,435,456
5
36,870,912
1,0
73,741,824
R1, ER1 (high-order 16 bits)
R0, ER0 (low-order 16 bits)
FNC 16
FMOVP
K0
R0
K200
Command
Command
FNC292
INITRP
R0
K2
The current value in Ro to R4095 is initialized
to "FFFF
H
".
Ex. FX
3U
/FX
3UC
 PLCs