Equipments (Devices) > SCA06 > Ladder > Logic > Logic Boolean

Block that performs a logical operation of boolean "not" in a variable, storing the result in another.

Ladder Representation

Block Structure

Variable Type	Name	Data Type	Description
VAR_INPUT	EN	BOOL	Block enabling
VAR_INPUT	Value	BYTE USINT SINT WORD UINT INT DWORD UDINT DINT	Reference variable for the operation
VAR_OUTPUT	ENO	BOOL	End of operation
VAR_OUTPUT	Result	BYTE USINT SINT WORD UINT INT DWORD UDINT DINT	Variable that stores the result of the operation

Operation

When this block has a TRUE value in EN, it sends to the Result output the denied Boolean value of the Value input variable.

When EN has FALSE value, Result remains unchanged.

The ENO value forwards to the next Ladder block the EN value after the operation is completed.

Block Flowchart

NOT_flowchart

Example in Ladder

NOT_example

The example above performs a boolean "not" operation in AUX, storing the result in AUX2.

Example in ST

The example below displays the instructions for applying the example above in the ST language.

VAR

AUX : BYTE := 2#0011_1011;

AUX2 : BYTE;

END_VAR

AUX2 := FB_NOT(

EN:=DI1,

Value:=AUX,

ENO=>DO1);