Delta Electronics DVP15MC11T, Operation Manual

Page: 100 / 601

Chapter 8 Logic Instructions
8_

Precautions for Correct Use

The input variables are not allowed to omit. An error will occur during the compiling of the software if
any input variable is omitted. But the output variable is allowed to omit.

The data type of output variables must be BOOL. Otherwise, an error will occur during the compiling
of the software.

Programming Example

The data types of LT_In1, LT_In2 and LT_In3 are INT, UINT and DINT respectively and the
data type of Out1 is BOOL.
Out1 changes to TRUE when the values of LT_In1, LT_In2 and LT_In3 are -10, 50 and 100
respectively and LT_EN changes to TRUE as shown in Variable 1.
Out1 changes to FALSE when the values of LT_In1, LT_In2 and LT_In3 are 20, 10 and 100
respectively and LT_EN changes to TRUE as shown in Variable 2.

Variable 1
Variable name Data type Current value
LT_EN BOOL TRUE
LT_In1 INT -10
LT_In2 UINT 50
LT_In3 DINT 100
Out1 BOOL TRUE

Variable 2
Variable name Data type Current value
LT_EN BOOL TRUE
LT_In1 INT 20
LT_In2 UINT 10
LT_In3 DINT 100
Out1 BOOL FALSE

The Program

The data types of LT_In1 and LT_In2 are both TIME and the data type of Out1 is BOOL.
Out1 changes to TRUE when the values of LT_In1 and LT_In2 are T#1ms and T#50ms respectively
and LT_EN is TRUE.

The variable table and program
Variable name Data type Current value
LT_EN BOOL TRUE
LT_In1 TIME T#1ms
LT_In2 TIME T#50ms
Out1 BOOL TRUE
1
LT
E N ENO
In 1 O ut
In 3
In 2
LT _EN
LT_ In1
LT_ In3
LT_ In2
Out1
1
LT
E N ENO
In 1 O ut
In 2
LT_ EN
LT_ In1
LT_ In2
Out1
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