8 APPLICATION INSTRUCTION
8.9 Real Number Instruction
531
8
Calculating the square root of single-precision real number
DESQR(P)/ESQRT(P)
These instructions calculate the square root of a value specified by (s), and store the operation result in the device specified
by (d). The DESQR(P) instructions can also be used as ESQRT(P).
Refer to
Added and Changed Functions for details on the ESQRT(P) instruction.
Setting data
■
Descriptions, ranges, and data types
■
Applicable devices
Processing details
• These instructions calculate the square root of a value specified by (s), and store the operation result in the device specified
by (d).
• Only a positive value can be set in (s). (The square root operation cannot be executed for a negative value).
• The table below shows the related devices.
Ladder diagram
Structured text
ENO:=DESQR(EN,s,d);
ENO:=DESQRP(EN,s,d);
FBD/LD
Operand Description
Range
Data type
Data type (label)
(s)
Data whose square root is calculated or head device
number where the data is stored
Single-precision real number
ANYREAL_32
(d)
Head device number for storing the operation result
Single-precision real number
ANYREAL_32
EN
Execution condition
Bit
BOOL
ENO
Execution result
Bit
BOOL
Operand
Bit
Word
Double word Indirect
specification
Constant
Others
X, Y, M, L, SM,
F, B, SB, S
T, ST, C, D, W,
SD, SW, R
U
\G
Z
LC
LZ
K, H
E
$
(s)
(d)
Device
Name
Description
Condition
Operation
SM8020
Zero
The operation result is true "0".
(The mantissa part is "0").
The zero flag SM8020 turns on.
(s)
(d)
EN
ENO
d
s
(s)+1
(s)
(d)+1
(d)
( )
Single-precision real number
Single-precision real number
Содержание MELSEC iQ-F FX5
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