Mitsubishi Electronics Mitsubishi Digital Electronics Video Gaming Accessories FX3G ユーザーズマニュアル
485
FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.1 FNC110 – ECMP / Floating Point Compare
11
FN
C
C
30
-FN
C
C
39
R
otati
on and
on and
Shi
ft
ft
12
FNC4
0-F
0-F
NC4
9
D
ata O
per
ati
per
ati
on
13
FN
C
C
50-FN
C
59
H
igh S
pe
ed
P
rocessing
14
FM
C
C
60-FN
C
69
H
andy
In
st
ru
ct
ion
15
FNC7
0-F
0-F
NC7
9
Ex
ter
nal FX
I/O
D
evice
16
FN
C
C
80-FN
C
89
Ext
ernal
FX
ernal
FX
De
vic
vic
e
17
FN
C
100-
FN
FN
C
10
9
Da
ta
Transf
er 2
er 2
18
FN
C
110-
FN
FN
C
139
Floati
ng Poi
nt
19
FN
C
14
0-F
N
C
149
Da
ta
O
per
at
at
ion 2
20
FN
C
150-
FN
FN
C
159
Posit
ioning
C
ont
ro
ro
l
18.1
FNC110 – ECMP / Floating Point Compare
Outline
This instruction compares two data (binary floating point), and outputs the result (larger, same or smaller) to three
single bit devices.
→ For handling of floating point, refer to Subsection 5.1.3.
1. Instruction format
2. Set data
*1.
When a constant (K or H) is specified, it is automatically converted from binary into binary floating point (real
number) when the instruction is executed.
3. Applicable devices
S1: "D
.b" is available only in FX
3U
/FX
3UC
PLCs, and cannot be indexed with index registers (V and Z).
S2: This function is supported only in FX
3U
/FX
3UC
PLCs.
Explanation of function and operation
1. 32-bit operation (DECMP and DECMPP)
The comparison value [
+1,
] is compared with the comparison source [
+1,
] as floating point
data, and either bit among
,
+1 and
+2 turns ON according to the result (smaller, same or larger).
• When a constant (K or H) is specified as [
+1,
] or [
+1,
], it is automatically converted from
binary into binary floating point (real number) when the instruction is executed.
Caution
1. Number of occupied devices
Three devices are occupied from
(
,
+1 and
+2).
Make sure that these devices are not used for any other purpose.
Operand Type
Description
Data Type
Device number storing binary floating point data to be compared
Real number (binary)
*1
Device number storing binary floating point data to be compared
Head bit device number to which the comparison result is output (Three devices are
occupied.)
occupied.)
Bit
Oper-
and
Type
Bit Devices
Word Devices
Others
System User
Digit Specification
System User
Special
Unit
Index
Con-
stant
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
S
2
3
3 3
3
3 3
S
2
3
3 3
3
3 3
3
S
1
3
P
FNC 110
ECMP
D
−
Mnemonic
Operation Condition
16-bit Instruction
DECMP
DECMPP
Mnemonic
Operation Condition
32-bit Instruction
13 steps
Continuous
Operation
Pulse (Single)
Pulse (Single)
Operation
S
1
S
2
D
S
1
S
2
D
S
1
S
1
S
2
S
2
D
D
D
S
1
S
1
S
2
S
2
Command
input
FNC110
DECMP
Even if the command input turns OFF and DECMP instruction is not executed, to +2 hold the status
before the please rewrite this command input turned OFF.
+1
+2
S
1
S
2
D
D
D
D
D
D
Turns ON in the case of
<
+1,
]
S
1
S
1
+1,
[ S
2
S
2
" [
] ".
Turns ON in the case of
=
+1,
]
S
1
S
1
+1,
[ S
2
S
2
" [
] ".
Turns ON in the case of
>
] ".
+1,
" [
]
S
1
S
1
+1,
[ S
2
S
2
D
D
D
D