Hello everybody,

it's possible to create an array dynamically?

I need to create something like this:

FUNCTION_BLOCK example

VAR_INPUT

_UpperBound: INT;

END_VAR

VAR_OUTPUT

END_VAR

VAR

MyArray :ARRAY[0..UpperBound] OF INT;

END_VAR

UpperBound :=_UpperBound;

PROGRAM MAIN

VAR

     x:INT;

     ex:example;

END_VAR

x := 3;

ex(_UpperBound := x);

Does someone can help me ?

Thanks for you help by advance.

It is not possible to create a dynamic array,

CoDeSys allocates the memory at build time not at runtime.

Robkristiaan is correct but if you are trying to change an upper bound "globally" like inside functions you build in a library ect... You can use a global constant like:

VAR_GLOBAL CONSTANT

MAX_ALARM_INDEX :INT := 24;

END_VAR

then you can change it in one place in the global variables and use it like:

MyArray :ARRAY[0..MAX_ALARM_INDEX] OF INT;

Make sure you select (Check box) in the PROJECT-OPTIONS-BUILD menu "Replace Constants" other wise you will get a compile error.

This is the closest to getting a dynamic array allocation by replacing with a constant.