Mitsubishi Electronics FX3G User Manual
515
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
Series
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.15 FNC127 – ESQR / Floating Point Square Root
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
18.15 FNC127 – ESQR / Floating Point Square Root
Outline
This instruction obtains the square root of binary floating point.
→ 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 into binary floating point (real number)
when the instruction is executed.
when the instruction is executed.
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. 32-bit operation (DESQR and DESQRP)
The square root of [
+1,
] is calculated (in the binary floating point operation), and the result is transferred
to [
+1,
].
Related device
→ For the zero flag use method, refer to Subsection 6.5.2.
Error
The contents of [
+1,
] are valid only when a positive value is set. When a negative value is set, the
operation error flag M8067 turns ON, and the instruction is not executed.
Operand Type
Description
Data Type
Word device number storing binary floating point data whose square root is calculated
Real number (binary)
*1
Data register number storing the square root of binary floating point data
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
S1
S2
S1
S2
Device
Name
Description
M8020
Zero flag
Turns ON when the operation result is true "0".
−
Mnemonic
Operation Condition
16-bit Instruction
DESQR
DESQRP
Mnemonic
Operation Condition
32-bit Instruction
9 steps
Continuous
Operation
Pulse (Single)
Pulse (Single)
Operation
P
FNC 127
ESQR
D
S
D
S
D
S
1
S
1
D
D
Command
input
FNC127
DESQR
→ [ +1, ]
Binary floating point
[ +1, ]
Binary floating point
S
D
S
D
S
D
S
1
S
1