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Mitsubishi Electronics FX3G User Manual

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166
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
 Series
Programming Manual - Basic & Applied Instruction Edition
6 What to Understand before Programming
6.1 How to Read Explanation of Instructions
6. What to Understand before Programming
This chapter explains the I/O processing, relationship among instructions and programming method which should be
understood before creating sequence programs.
6.1
How to Read Explanation of Instructions
In this manual, applied instructions are explained in the following form.
For the expression methods and basic rules for applied instructions, read in advance "6.5 General rules for applied
instructions" described later.
The above is different from the actual page, as it is provided for explanation only.
265
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
 Series
Programming Manual - Basic & Applied Instruction Edition
10 Arithmetic and Logical Operation (, , u, y) – FNC 20 to FNC 29
10.1 FNC 20 – ADD / Addition
1
In
tro
duc
tion
2
Ove
rvi
ew
3
In
st
ru
ct
io
n 
Li
st
4
D
evi
ce
s 
in
 D
eta
il
5
Sp
ecif
ie
d t
he
D
evice
 & 
C
ons
tan
t
6
Be
fo
re
 
Pr
og
ra
mmi
ng
7
Ba
sic 
In
st
ru
ct
io
n
8
FN
C
00
-F
N
C
09
Pro
gra
m F
lo
w
9
FN
C
10
-FN
C
19
Mo
ve
 &
 C
omp
are
10
FN
C
20
-F
N
C
29
Ar
ith.
 &
 L
ogi
c 
O
per
at
ion
10.1
FNC 20 – ADD / Addition
Outline
This instruction executes addition by two values to obtain the result (A + B = C).
oFor the floating point addition instruction EADD (FNC120), refer to Section 18.8.
1. Instruction format
2. Set data
3. Applicable devices
S1: This function is supported only in FX
3G
/FX
3GC
/FX
3U
/FX
3UC
 PLCs.
S2: This function is supported only in FX
3U
/FX
3UC
 PLCs.
Explanation of function and operation
1. 16-bit operation (ADD and ADDP)
The contents of 
 are added to 
 in binary format, and the addition result is transferred to 
.
• The most significant bit of each data indicates the sign (positive: 0 or negative: 1), and data is added algebraically.
5 + (8) = 3
• When a constant (K) is specified in 
 or 
, it is automatically converted into binary format.
2. 32-bit operation (DADD and DADDP)
The contents of [
+1, 
] are added to [
+1, 
] in binary format, and the addition result is
transferred to [
+1, 
].
• The most significant bit of each data indicates the sign (positive: 0 or negative: 1), and data is added algebraically.
5500 + (8540) = 3040
• When a constant (K) is specified in [
+1, 
] or [
+1, 
], it is automatically converted into binary 
format.
Operand type
Description
Data type
Data for addition or word device number storing data
16- or 32-bit binary
Data for addition or word device number storing data
16- or 32-bit binary
Word device number storing the addition result
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 S1
S2
3 3
3
3 3
3
3
3
3
3 3 3 S1
S2
3 3
3
3 3
3
3
3
3 3 3 S1
S2
3 3
3
DADD
DADDP
Mnemonic
Operation Condition
P
FNC 20
ADD
D
16-bit Instruction
 7 steps ADD
ADDP
Mnemonic
Operation Condition
Continuous
Operation
Pulse (Single)
Operation
32-bit Instruction
 13 steps
Continuous
Operation
Pulse (Single)
Operation
S
1
S
2
  D
S
1
S
2
  D
S
2
S
1
D
FNC 20
ADD
S
1 ‚
S
2 ‚
         +           o
Command
input
D ‚
S
1 ‚
S
2 ‚
D ‚
S
1
S
2
S
2
S
2
S
1
S
1
D
1
D
1
FNC 20
DADD
S
1 ‚
S
2 ‚
[          +1,          ] + [          +1,          ] o>1,          ]
Command
input
D ‚
S
1 ‚
S
2 ‚
D ‚
S
1 ‚
S
2 ‚
D ‚
S
1
S
1
S
2
S
2
Indicates applicable 
PLC versions.
Applicable 
series
Expression of applicable versions
– 
→ Ver. 2.20: before Ver. 2.20
– Ver. 2.20 
→: Ver. 2.20 or later