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Selection instructions
MAX
MAX determines the input variable with the highest value.
Description
To add an enable input and enable output to the instruction, select [With EN/ENO] from the
"Instructions" pane (LD, FBD or IL editor). To reuse an instruction select "Recently used" from the
context menu or press <Ctrl>+<Shift>+<v> in the programming window.
Availability of MAX (see page 1328)
PLC types
The number of input contacts lies in the range of 2 to 28.
Data types
Data type
all except
STRING
all except
STRING
all except
STRING
In this example, the same POU header is used for all programming languages. For an example
Example
using IL (instruction list), please refer to the online help.
POU header
All input and output variables used for programming this function have been declared in the POU
header.
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.
Body
Value_1 and value_2 are compared with each other. The maximum value of all input variables is
written in maximum_value.
LD
ST
When programming with structured text, enter the following:
maximum_value:=MAX(value_1, value_2);
254
Maximum value
I/O
Function
1st input
value 1
2nd input
value 2
output as input
result, whichever input variable's value is greater
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