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295
FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
10 Arithmetic and Logical Operation (
+
,
−
,
×
,
÷
) – FNC 20 to FNC 29
10.5 FNC 24 – INC / Increment
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
10.5
FNC 24 – INC / Increment
Outline
This instruction increments the data of a specified device by "1".
1. Instruction format
2. Set data
3. Applicable devices
S
: This function is supported only in FX
3U
/FX
3UC
PLCs.
Explanation of function and operation
1. 16-bit operation (INC and INCP)
The contents of
are incremented by "1", and the increment result is transferred to
.
2. 32-bit operation (DINC and DINCP)
The contents of [
+1,
] are incremented by "1", and the increment result is transferred to [
+1,
].
Cautions
1. Note that data is incremented in every operation cycle in a continuous operation type
instruction.
2. Flag operations
1) 16-bit operation
When "+32767" is incremented by "1", the result is "
−
32768". Flags (zero, carry and borrow) are not
activated at this time.
2) 32-bit operation
When "+2,147,483,647" is incremented by "1", the result is "
−
2,147,483,648". Flags (zero, carry and
borrow) are not activated at this time.
Operand type
Description
Data type
Word device number storing data to be incremented by "1"
16- or 32-bit binary
Oper-
and
Type
Bit Devices
Word Devices
Others
System User
Digit Specification
System User
Special
Unit
Index
Con-
stant
Real
Number
Charac-
ter String
Pointer
X Y M T C S D
.b KnX KnY KnM KnS T C D R U
\G
V Z Modify K H
E
"
"
P
3
3
3
3 3 3 3
S
3 3
3
DINC
DINCP
Mnemonic
Operation Condition
P
FNC 24
INC
D
16-bit Instruction
3 steps INC
INCP
Mnemonic
Operation Condition
Continuous
Operation
Pulse (Single)
Operation
32-bit Instruction
5 steps
Continuous
Operation
Pulse (Single)
Operation
D
D
D
D
Command
input
FNC 24
INCP
+ 1
→
D
D
D
D
D
D
D
Command
input
FNC 24
DINCP
D
D
[ +1, ] + 1
→
[ + 1, ]
D
D
D