Chapter 8 Logic Instructions
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 LE_In1, LE_In2 and LE_In3 are INT, UINT and DINT respectively and the
data type of Out1 is BOOL.
Out1 changes to TRUE when the values of LE_In1, LE_In2 and LE_In3 are -10, 50 and 50
respectively and LE_EN changes to TRUE as shown in Variable 1.
Out1 changes to FALSE when the values of LE_In1, LE_In2 and LE_In3 are 20, 10 and 100
respectively and LE_EN changes to TRUE as shown in Variable 2.
Variable 1
Variable name Data type Current value
LE_EN
BOOL
TRUE
Variable 2
Out1 BOOL
FALSE
The Program
The data types of LE_In1 and LE_In2 are both TIME and the data type of Out1 is BOOL.
Out1 changes to TRUE when the values of LE_In1 and LE_In2 are T#1ms and T#50ms respectively
and LE_EN is TRUE.
The variable table and program
LE_In1
TIME
T#1ms
LE_In2
TIME
T#50ms
Out1
BOOL
TRUE
1
LE
EN ENO
In1 Out
In3
In2
LE_EN
LE_In1
LE_In3
LE_In2
Out1
1
LE
EN ENO
In1 Out
In2
LE_EN
LE_In1
LE_In2
Out1
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