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

Logical block that performs an Boolean "or" operation between two variables, storing the result in a third one.

Ladder Representation

OR_block

Block Structure

Variable Type	Name	Data Type	Description
VAR_INPUT	EN	BOOL	Block enabling
	Value1	BYTE USINT SINT WORD UINT INT DWORD UDINT DINT	Variable for the operation
	Value2	BYTE USINT SINT WORD UINT INT DWORD UDINT DINT	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 "or" Boolean operation of input variables Value1 and Value2.

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

OR_flowchart

Example in Ladder

OR_example

The example above performs an "or" Boolean operation between AUX and AUX2, storing the result in AUX3.

Example in ST

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

VAR

AUX : BYTE := 2#1100_1110;

AUX2 : BYTE := 2#1001_1100;

AUX3 : BYTE;

END_VAR

AUX3 := FB_OR(

EN:=DI1,

Value1:=AUX,

Value2:=AUX2,

ENO=>DO1);