MAX

Maximum value

MAX determines the input variable with the highest value.

Parameters

Input

Unnamed input (ANY) except STRING: 1st input: value 1
Unnamed input (ANY) except STRING: 2nd input: value 2

Output

Unnamed output all except STRING: result, whichever input variable's value is greater

Remarks

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

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
		value_1: INT:=0;
			(*all types allowed*)
		value_2: INT:=0;
			(*all types allowed*)
		maximum_value: INT:=0;
			(*all types allowed*)
	END_VAR

In this example the input variables (value_1 and value_2) have been declared. Instead, you may enter a constant directly at the input contact of a function.

POU body

Value_1 and value_2 are compared with each other. The maximum value of all input variables is written in maximum_value.

LD body

BODY
    WORKSPACE
        NETWORK_LIST_TYPE := NWTYPELD ;
        ACTIVE_NETWORK := 0 ;
    END_WORKSPACE
    NET_WORK
        NETWORK_TYPE := NWTYPELD ;
        NETWORK_LABEL :=  ;
        NETWORK_TITLE :=  ;
        NETWORK_HEIGHT := 3 ;
        NETWORK_BODY
B(B_F,MAX-2!,Instance,7,0,12,3,,?D?D?C);
B(B_VARIN,,value_1,5,0,7,2,);
B(B_VARIN,,value_2,5,1,7,3,);
B(B_VAROUT,,maximum_value,12,0,14,2,);
L(1,0,1,3);
        END_NETWORK_BODY
    END_NET_WORK
END_BODY

ST body

maximum_value:=MAX(value_1, value_2);

IL body

LD	value_1
MAX	value_2
ST	maximum_value

NOTE

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