MIN

Compares Value1 and Value2 and stores the lower value in Result.

Ladder Representation

Block Structure

Variable Type	Name	Data Type	Description
VAR_INPUT	EN	BOOL	Block enabling.
VAR_INPUT	Value1	BYTE USINT SINT WORD UINT INT DWORD UDINT DINT REAL	First comparison value.
VAR_INPUT	Value2	BYTE USINT SINT WORD UINT INT DWORD UDINT DINT REAL	Second comparison value.
VAR_OUTPUT	Done	BOOL	End of operation.
VAR_OUTPUT	Result	BYTE USINT SINT WORD UINT INT DWORD UDINT DINT REAL	Lower of the compared values.

Operation

When EN is TRUE, the block compares Value1 and Value2 and writes the lower value to Result.

If the operation completes without errors, Done is set. If an operation error occurs, Done remains FALSE and Result keeps its previous value.

When EN is FALSE, Result remains unchanged and Done remains FALSE.

Execution Flowchart

Examples

Ladder Example

This example calculates the minimum value between VALUE1 and VALUE2 and stores the final result in RESULT. The block completes successfully and activates Done.

This example calculates the minimum value between VALUE1 and VALUE2 and stores the final result in RESULT. The block completes successfully and activates Done. The input variable types can differ without causing execution problems.

This example calculates the minimum value between VALUE1 and VALUE2 and stores the final result in RESULT. Because the result is lower than the minimum value supported by SINT, the block reports an error and disables Done.

Structured Text Example

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

Structured Text

VAR
    VALUE1 : REAL := -90.8;
    VALUE2 : SINT := 32;
    RESULT : SINT;
END_VAR

RESULT := FB_MIN(
    EN:=DI1,
    Value1:=VALUE1,
    Value2:=VALUE2,
    Done=>DO1);