OR

Performs a Boolean OR operation between two values.

Ladder Representation

Block Structure

Variable Type	Name	Data Type	Description
VAR_INPUT	EN	BOOL	Block enable.
VAR_INPUT	Value1	BYTE USINT SINT WORD UINT INT DWORD UDINT DINT	Operation variable.
VAR_INPUT	Value2	BYTE USINT SINT WORD UINT INT DWORD UDINT DINT	Operation variable.
VAR_OUTPUT	ENO	BOOL	End of operation.
VAR_OUTPUT	Result	BYTE USINT SINT WORD UINT INT DWORD UDINT DINT	Variable that stores the operation result.

Operation

When EN is TRUE, the block writes to Result the Boolean OR operation between Value1 and Value2.

When EN is FALSE, Result remains unchanged.

After the operation is complete, ENO passes the EN value to the next Ladder block.

Execution Flowchart

Examples

Ladder Example

The Ladder example performs a Boolean OR operation between AUX and AUX2 and stores the result in AUX3.

Structured Text Example

The following Structured Text code applies the same logic shown in the Ladder example.

Structured Text

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);