Delta Electronics DVP15MC11T Operation Manual page 160


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 value of Out varies between 0 and π when the value of In changes between -1.0 and 1.0. The

instruction will not go to the error state if the value of In is out of -1.0 ~1.0 and the value of Out is
nonnumeric.
The variable table and program
Variable name
ACOS_EN
ACOS_In
Out1

Programming Example

The data types of variables ACOS_In and Out1 are REAL and LREAL respectively. The value of
Out1 is 0 if the value of ACOS_In is 1.0 when ACOS_EN changes to TRUE. The value of Out1 is
3.14159265358979 as ACOS_In is -1.0.

Variable
Variable name
ACOS_EN
ACOS_In
Out1

Variable
Variable name
ACOS_EN
ACOS_In
Out1

The program
Data type
BOOL
REAL
LREAL
1
ACO S
ACO S_EN EN E NO
A CO S_I n In Out
Data type
BOOL
REAL
LREAL
Data type
BOOL
REAL
LREAL
1
ACO S
ACO S_EN EN E NO
A CO S_I n In Out O ut1
Chapter 8 Logic Instructions
Current value
TRUE
2.0
1.#QNAN
O ut1
Current value
TRUE
1.0
0
Current value
TRUE
-1.0
3.14159265358979
8_
8-89