Delta Electronics DVP15MC11T - Page 166

Chapter 8 Logic Instructions
8_

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 non-positive number
as shown in the following table.
The variable table and program
Variable name
Data type
Current value
LOG_EN BOOL TRUE
LOG_In REAL -2.0
Out1
LREAL
1.#QNAN
1
LOG
EN ENO
In Out
LOG_EN
LOG_In Out1
 Programming Example

The data types of variables LOG_In and Out1 are INT and LREAL respectively. The value of Out1 is
0.0 if the value of LOG_In is 1 when LOG_EN changes to TRUE. The value of Out1 is 1.0 as
LOG_In is 10.
 Variable 1
Variable name
Data type
Current value
LOG_EN
BOOL
TRUE
LOG_In
INT
1
Out1 LREAL 0.0
 Variable 2
Variable name
Data type
Current value
LOG_EN BOOL TRUE
LOG_In INT 10
Out1
LREAL
1.0
 The program
1
LOG
EN ENO
In Out
LOG_EN
LOG_In Out1
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