LT

Less than

The content of the accumulator is compared with the operand defined in the operand field. If the accumulator is less than the reference value, "TRUE" is stored in the accumulator, otherwise "FALSE".

Parameters

Input

Unnamed input (ANY): 1st input: value for comparison
Unnamed input (ANY): 2nd input: reference value

Output

Unnamed output (BOOL): Result, TRUE if value for comparison is less than the reference value

Remarks

Inputs can be of any data type; all input variables must be of the same data type though. Output must be of type BOOL.
This function can be expanded to a maximum of 28 input contacts, see also modifying elements.
When using more inputs, the first input is compared with the second, the second input is compared with the third input etc. If the first value is less than the second value AND the second value is less than the third value etc., TRUE will be written into result, otherwise FALSE.

Example

POU header

All input and output variables used for programming this function have been declared in the POU header. The same POU header is used for all programming languages.

	VAR
		enable: BOOL:=FALSE;
		comparison_value: INT:=0;
		reference_value: INT:=0;
		result: BOOL:=FALSE;
	END_VAR

In this example the input variables (comparison_value, reference_value and enable) have been declared. Instead, you may enter constants directly into the function (enable input e.g. for tests).

POU body

If enable is set (TRUE), the comparison_value is compared with the reference_value. If the comparison_value is less than the reference_value, TRUE will be written into result, otherwise FALSE.

LD body

BODY
    WORKSPACE
        NETWORK_LIST_TYPE := NWTYPELD ;
        ACTIVE_NETWORK := 0 ;
    END_WORKSPACE
    NET_WORK
        NETWORK_TYPE := NWTYPELD ;
        NETWORK_LABEL :=  ;
        NETWORK_TITLE :=  ;
        NETWORK_HEIGHT := 5 ;
        NETWORK_BODY
B(B_VARIN,,comparison_value,7,2,9,4,);
B(B_VARIN,,reference_value,7,3,9,5,);
B(B_VAROUT,,result,15,2,17,4,);
B(B_CONTACT,,enable,3,1,5,3,);
B(B_F,E_LT-2!,Instance,9,0,15,5,,?DEN?D?D?AENO?C);
L(1,0,1,5);
L(1,2,3,2);
L(5,2,9,2);
        END_NETWORK_BODY
    END_NET_WORK
END_BODY

IL body

NOTE

This function can be expanded to a maximum of 28 input contacts, see also modifying elements.