REAL_TO_BYTE

The REAL_TO_BYTE block converts a REAL value to BYTE.

Ladder representation

Block structure

Variable Type	Name	Data Type	Description
VAR_INPUT	EN	BOOL	Block enable.
VAR_INPUT	Value	REAL	REAL value.
VAR_OUTPUT	ENO	BOOL	End of operation.
VAR_OUTPUT	Result	BYTE / USINT / SINT	BYTE value.

Operation

When EN is TRUE, the block interprets Value as a REAL value, converts it to BYTE, and stores the result in Result.

When EN is FALSE, Result remains unchanged.

The ENO output passes the EN state to the next Ladder block after the operation is finished.

Conversion Behavior

Only the eight least significant bits are considered in the result.

Conversion Behavior

Decimal results are truncated before the final value is stored.

Execution flowchart

Examples

Ladder

The Ladder examples convert VALUE from REAL to BYTE, store the final value in RESULT, and activate ENO when the block finishes successfully.

Structured Text

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

Structured Text

VAR
    VALUE : REAL := 1.9;
    RESULT : SINT;
END_VAR

RESULT := FB_REAL_TO_BYTE(EN:=DI1, Value:=VALUE, ENO=>DO1);