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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.15 FNC127 – ESQR / Floating Point Square Root
11
FNC30-FNC39
Rotation and
Shift
12
FNC40-FNC49
Data Operation
13
FNC50-FNC59
High Speed
Processing
14
FMC60-FNC69
Handy
Instruction
15
FNC70-FNC79
External FX I/O
Device
16
FNC80-FNC89
External FX
Device
17
FNC100-FNC109
Data
Transfer 2
18
FNC110-FNC139
Floating Point
19
FNC140-FNC149
Data
Operation 2
20
FNC150-FNC159
Positioning
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.
3. Applicable devices
S: This function is supported only in FX3U/FX3UC 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
Real
Number
Charac-
ter String
Pointer
XYMTCSD.b KnX KnY KnM KnS T C D R U\G VZModifyKH E ""P
33 S 333 3
33 S 3
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)
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