Delta Electronics DVP15MC11T Operation Manual page 168


Users can choose different data types for the input parameter in this instruction. But the data type of
the output parameter is restricted to LREAL. An error will occur during the compiling of the software
if the data type of the output parameter is not LREAL.

Precautions for Correct Use

The input variable is not allowed to omit. An error will occur during the compiling of the software if
the input variable is omitted. But the output variable is allowed to omit.

The output value of Out is a nonnumeric value when the input value of In is a negative number.
The variable table and program
Variable name
SQRT_EN
SQRT_In
Out1

Programming Example

The data types of variables SQRT _In and Out1 are INT and LREAL respectively. The value of Out1
is 4.0 if the value of SQRT _In is 16 when SQRT _EN changes to TRUE. The value of Out1 is 10.0
as SQRT_In is 100.

Variable 1
Variable name
SQRT_EN
SQRT_In
Out1

Variable 2
Variable name
SQRT_EN
SQRT_In
Out1

The program
Out
2
1
0 1 4
Data type
BOOL
REAL
LREAL
1
S QRT
SQRT_EN EN ENO
SQ RT_In I n O ut
Data type
BOOL
INT
LREAL
Data type
BOOL
INT
LREAL
1
S QRT
SQRT_EN EN ENO
SQ RT_In I n O ut
Chapter 8 Logic Instructions
In
Current value
TRUE
-2.0
1.#QNAN
Out 1
Current value
TRUE
16
4.0
Current value
TRUE
100
10.0
Out 1
8_
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