Mitsubishi MELSEC iQ-F FX5 series User Manual

7 APPLICATION INSTRUCTION
7.7 Real Number Instruction
453
7
Calculating the square root of single-precision real number
DESQR(P)
These instructions calculate the square root of a value specified by (s), and store the operation result in the device specified
by (d).
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.
Operation error
Ladder diagram Structured text
ENO:=DESQR(EN,s,d);
ENO:=DESQRP(EN,s,d);
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 Single-precision real number
(d) Head device number for storing the operation result  Single-precision real number Single-precision real number
Operand Bit Word Double word Indirect
specification
Constant Others
X, Y, M, L,
SM, F, B, SB
U\G T, ST,
C, LC
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.
Error code
(SD0/SD8067)
Description
3402 The specified device value is denormalized number, NaN (not a number), or .
3405 The value stored in a device specified in (s) is negative.
(s) (d)
(s)+1 (s) (d)+1 (d)
( )
Single-precision real number Single-precision real number

Mitsubishi MELSEC iQ-F FX5 series Specifications

General

Brand	Mitsubishi
Model	MELSEC iQ-F FX5 series
Category	Controller
Language	English