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33
FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
2 Overview (Sequence Program)
2.5 Introduction of Devices Constructing PLC
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
6. Data registers (D)
→
Refer to Section 4.9.
Data registers store numeric data values.
All data registers in FX PLCs are 16-bit type
(whose most significant bit is positive or
negative). When two consecutive registers are
combined, they can handle 32-bit numeric value
(whose most significant bit is positive or
negative).
(For the numeric value range, refer to "Counter"
on the previous page.)
In the same way as other devices, data registers
are classified into general type and latched type
(battery backed).
7. Extension registers (R) and extension file
registers (ER)
→
Refer to Section 4.10.
Extension registers (R) are the extended form of
data registers (D). They are protected by the
battery against power failure in FX
3U
/FX
3UC
PLCs.
In FX
3G
PLCs, general type devices can be
protected against power failure when the optional
battery is connected.
In FX
3G
/FX
3U
/FX
3UC
PLCs, the contents of
extension registers (R) can be stored in
extension file registers (ER).
In FX
3U
/FX
3UC
PLCs, extension file registers
(ER) can be used only while a memory cassette
is mounted.
8. Index registers (V)(Z)
→
Refer to Section 4.11.
Among registers, there are index type registers V
and Z used for modification.
A data register V or Z is added to another device
as follows:
[In the case of "V0, Z0 = 5"]
D100V0 = D105, C20Z0 = C25
←
Device
V
or Z
value
Data registers and index registers are used for
indirectly specifying the set value of timers and
counters, or used in applied instructions.
9. Pointers (P)(I)
→
Refer to Section 4.12.
Pointers are classified into branch pointers and
interrupt pointers.
• A branch pointer (P) specifies the jump
destination of the conditional jump CJ (FNC
00) or the call subroutine CALL (FNC 01)
instruction.
• An interrupt pointer (I) specifies the routine of
an input interrupt, timer interrupt or counter
interrupt.
10.Constants (K)(H)(E)
→
Refer to Chapter 5.
Constant numerical values used in the PLC, "K"
indicates a decimal integer value, "H" indicates a
hexadecimal value, and "E" indicates a real
number (floating point data).
Constants are used as set values or present
values of timers and counters, or operands for
applied instructions.