Mitsubishi Electronics FX3G User Manual
487
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
Series
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.1 FNC110 – ECMP / Floating Point Compare
11
FN
C30
-FN
C3
C30
-FN
C3
9
R
ota
tion and
Shi
ft
ft
12
FN
C40-FN
C40-FN
C49
D
ata O
perati
perati
on
13
FNC
50-FNC
59
High-Speed
Proc
essing
14
FM
C60-FN
C60-FN
C69
H
andy
In
struction
15
FN
C70-FN
C70-FN
C79
E
xternal
F
X
I/O
De
vice
16
FNC
80-FNC
89
External
FX
Dev
ice
ice
17
FNC1
00-
FNC10
00-
FNC10
9
Dat
a
a
Transfer 2
18
FNC1
10-
FNC139
FNC139
Fl
oati
ng Poi
nt
19
FNC14
0-F
N
C
149
Da
ta
Operation 2
20
FNC1
50-
FNC159
FNC159
Pos
itioning
itioning
Control
18.1
FNC110 – ECMP / Floating Point Compare
Outline
This instruction compares two data values (binary floating point), and outputs the result (larger, same or smaller) to
three consecutive 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
3G
/FX
3GC
/FX
3U
/FX
3UC
PLCs.
S3: 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 one of the bits among
,
+1 and
+2 turns ON according to the result (smaller, same or
larger).
• When a constant (K or H) is specified as [
• 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
S
2
S
3
S
2
S
3
S
1
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 before the DECMP instruction is fully executed,
to +2 hold the status.
+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